Anurag sir, this is one of the best tutorials for ADS. Covered so many unknown concepts of ADS, for me. I would have saved a lot of time if I had the access to this video a year before. Better late than never, I got to see this video. Thank you so much, sir. You are a virtual Guru for me.
Since you've helped me so... so much, I'd like to give you a quick tip for sorting out all the working windows onto your screen underview. Try windows+right (or left) to shift the selected window to the right half or right half of your screen, and upon further using down or up you can get the window to be quarter of the full working screen.
Could you please make a detailed tutorial video on PA design. Starting from the very basics- stability, load pull etc till DPD and real life signals. That would be immensely helpful. Your videos are the ones which “actually” teach something rather than giving a vague outline, which most other people do. I follow your tutorials very closely and have learnt a lot from them. Thank you sir.
Noted! Its on my to-do list however we have many videos to cover before we start talking about PA designs but it is surely in my list to do in near future....Stay tuned and keep learning & pass constructive feedback. Appreciate your support...👍
Discussing on some practical points are really helpful. Adding LiineCalc toolbar is new to me. You told there are more features which you'll open up in upcoming videos. These 140+ mins video on matching networks actually covered the every bits of the subject in real depth. Such kind of detailed and long video tutorials are much appreciated from learning point of view. Hope to see such detailed demonstration on LNA with practical aspects in next tutorial series.
Hi Riju, Thanks for your comments. I will plan to have another video on LineCalc as there are many capabilities offered by the tool which designers may not know. LNA design will also be covered in detail with practical aspects as well.
Hi Kishore, While designing inter-stage matching networks using Smith Chart utility simply use a series capacitor along with rest of the transmission lines. There is nothing great about it....😊
Mr Anurag, you made small mistake when you translating transmission line to microstrip, you omitted frequency to be 6GHz, but you set it to 10GHz. Thanks for your great video.
Mr. Bhargava, when you converted the transmission lines, you used 10GHz instead of 6GHz. Just wanted to say the electrical length would have been different at that frequency. Overall, great video and very educational ! Much Appreciated!
My bad....thanks for catching it. Sometimes it happens when you create live recording video....😊 We always have optimization to our rescue....LOL..!! I am glad you watched it carefully and liked it....
Best tutorials anyone can find. I was looking for broadband impedance matching for a long time. Thank you. Sir, can you tell me where and how can we do connector to GCPW transition simulation for mm-wave frequency?
Hi Manisha, You can use EMPro standalone simulate such structure and flow will be to export ADS Layout to EMPro and then add a SMA connector model to perform combined simulation. As a 2nd option, you can bring in EMPro based 3D components such as SMA into ADS and then use the built-in FEM simulator to perform such analysis with great ease. I have the plan to have such tutorials in the near future and you should see some of those after 15th Aug on my RUclips channel...
Simply wow!! I've been using ADS for many purposes but this tutorial was simply amazing. There is a one question. Doing impedance matching for small bandwidth is easier compared to wideband matching. I'm using multiple RF SMT components in series cascaded manner and when I cascade them, the overall return loss degrades despite the fact the their individual s-parameters are very good. Nope my frequency is upto 26 GHz and I'm unable to control the return loss crossing 10 dB threshold even with matching techniques using radical stubs for wideband matching. Any insight into this problem? Any literature, video, documents, books or anything related will be of great help. Thanks once again for wonderful tutorial.
Hi Hamza, Too many queries here but let me try to answer: 1. Thanks for your feedback and I am glad you liked it. 2. For wideband matching kindly see RF Design-7 tutorial. When overall return loss degrades that's where RF/uWave fun begins...😊 Kindly use SP_Probes to inspect impedances between network and try to approach your matching network design scientifically instead of using brute force. 3. When you say your frequency is upto 26GHz, I am not sure what are you using for fabrication as PCBs will have high loss and sensitivity to anything above 18GHz so things will get very tricky. Using distributed matching is one of the option but you will need to use something like 5mil or 10mil (max) substrate to avoid radiations and etching high impedance lines on such substrate would be quite challenging. Best of Luck...
@@BhargavaAnurag I appreciate you replying our comments and that's encouraging 😊. Yes, I'm using 5 mil substrate with 50 micron lines accuracy. I'll go through the tutorial and methods you mentioned and hopefully it'll help as always. Thanks again 😊
Amazing video! I'd like to ask for your opinion on what should I do if I want to simply just set the microstrip line between two components without considering about matching? How should I set the dimensions of the lines?
Hi Pay, Usually we prefer using a 50Ohm line to connect between components and you can calculate the width of 50Ohm line using Line Calc depending on the substrate properties. Hope this helps...👍
Good day sir, thank you for your effort for making such informative videos! May I know if it’s possible to add components soldering pads to the layout of the circuit before exporting it into a gerber file?
Dear Anurag, thank you for the valuable video. Could you help me find one video where you do match the s2p models of 2 cascaded filters? I believe it was on your channel but I cannot find it. Many thanks
great video tutorial sir , my question is that , during the process of impedance matching , instead of using the smith chart method , can we use optimization cockpit for the same by assigning 2 stubs and a transmission line, all of random length while keeping the width constant for the required frequency of operation ( w calculated using line cal) . After that we can assign the goals required for optimal gain and minimum return loss , then just run the optimization cockpit. ???
Hi Vineeth, Yes, the approach you said will work and for that you don't need to even use LineCalc...Experienced designers do so because when you have a sense of what will take to do impedance match then you can simply reuse previously designed networks and optimize its performance to suit your applications. I will cover those techniques in future tutorials.
I’m trying to match a broad band antenna but the smith chart tool only tunes one frequency. I’m trying to explore alternative cosim strategies but nothing is giving a good impedance in broadband. I’m matching 617mhz to 5GHz and the antenna is very high impedance at low band. Do you have any advice? I appreciate your tips here but I’m not able to implement them for my purpose, other than possibly redesigning my antenna
Sir, I have a doubt, if the width can't be increased beyond 3mm(Z0 = 24.57) then the limit on Z0 will be 25 and not 24 , because to get Z0 = 24, we should increase width further.
Usually it is never a problem for fabricator to print lines as wide as you want so there shouldn't be any concern. Even if it is a concern for you due to overall size etc then also you can design circuits within the constraints you have.
I thought I covered it in great details during the LNA design video itself...its pretty simple and you can look at the details I provided in the LNA design video
Helpful videos sir. I have a query sir, can we build a matching circuit without using smith chart. I am trying to design from a paper where the matching circuit is built using microstrip components such as MBSTUB, MTaper,etc
Smith Chart makes it easier to visualize how your matching components transforms the impedance when you add different components. If you already have the right network topology then you can simply use optimization feature in the software to achieve the needed impedance without using Smith Chart.
Hi Mr. Anurag, I really enjoy your video tutorials, it is very helpful ^^ What is the Layout Units/ Resolutions settings that you are using? I couldn’t get my circuit to fit perfectly like yours even though my microstrip lines dimension are similar to yours... /.\
Hi Anurag, When using the microstrip Tee junction model, I get warnings saying that I have violated the largest width to smallest width ratio for the model. This is a result of having generated an optimized impedance matching network. Should I ignore these errors and proceed to layout? Or, should I allow this constraint to dictate how good of an impedance match I can achieve?
Hi Abraham, Schematic discontinuity models use analytical equation in Schematic which has their limits to maintain the accuracy of the formulation or the assumption they are build upon and usually for models such as TEE and STEP etc it is 1:5 or 1:10 ratio that they recommend, if you cross that then you will see these kind of warnings in the simulation status. You can ignore them and your simulation will surely run but it is telling you that if there is any reflection happening at that junction it will not be accurately captured in your circuit simulation and when you perform EM simulation you will see increased discrepancy between schematic and EM results. EM simulator are physics based so they don't have any limitations for the width ratio at junctions and will capture any distortion caused due to high width mismatch. Personally, I never like to have this kind of situation as it is not a good design practice (however no one is stopping you in having these in your designs) and if I see this situation after optimization then I will try to create a stepped impedance section for that transition e.g. you can go from 0.2mm width to 0.8mm and then eventually to 3mm instead of directly connecting 0.2mm wide line to 3mm line as then the impedance mismatch will be too high and bigger reflections will surely happen depending on dielectric material and frequency of operation. Hope this helps in some manner?
What can you do when you're using a PDK which doesn't appear in the Line Calc. tool for substrate definitions? How can you convert TLIN elements to MLIN which are in the PDK?
Hi, I couldn't understand the exact query. You normally don't use LineCalc for PDK as design manual might provide 50Ohm width already and in some PDK when you change the width it shows the impedance in the dialog box itself. If none of that works then you can simply create a schematic template with 2 50 Ohm terminations, place you line and make width to be optimizable with S11 optimization goal as better than -40dB or so and ADS will let you know what width value provides the best matching and that's your 50Ohm width. If you need any other impedance than 50Ohm then simply change the terminations value to that number and run optimization to obtain width value for that impedance. Hope this helps...
I am following your video and it’s being very helpful. Can you please help me if I want to design input and output matching network only with MLIN transmission line without using MLOC lines .It will be great help. Thanks in advance.
Hi, That will depend on the impedances that you want to match and may not be always possible. You can the Smith Chart tool so feel free to try out whatever topology you want and play with the impedance of the lines to adjust the locus and drive it to the desired point as per your requirements.
@@BhargavaAnurag Thank you Sir . I will try for same. Please can you make one video on load pull simulation using ADS in correct manner because your videos are very clear and show the right path.Thank you.
Thank you so much for this valuable video. Please, after we design this on ADS and fabricate the circuit, we need to add an SMA to connect it to a coaxial cable, and this will change the circuit. Then, can you explain how to remove the effect of adding an SMA in the circuit to obtain similarity between measured and simulated results (Signal integrity)? Thank you again.
Hi Melad, There can be multiple approaches: 1. First you need to ensure Calibration was done on VNA, that will take care of the cable part reaching up to the connector on your board. 2. To model connector, you can cascade the S2P file of the connector alongwith ADS results to see overall behavior. 3. You can add 3D connector model of the connector and perform full 3D EM simulation to get results upto the connector output side. 4. Deembbed connector during your VNA measurements
Kindly watch the video on Layout footprint etc under Learn ADS in 5mins playlist. Its very easy to create a footprint and associate it to any component you have in your schematic design.
Hi, Kindly see this video i.e. Tutorial-26 under Learn ADS in 5mins playlist: ruclips.net/video/HsZXTfB8SWg/видео.html There I ran a parameter sweep but you could run Optimization in schematic. Be careful in not running optimization blindly in EM cases and I always prefer to run nested parameter sweeps and then turn on the interpolation in EM models to arrive at optimum values via optimization.
@@BhargavaAnurag thank you I will check that. Also what setting do I change to prevent it from doing that? I thought that is all code running in the background and we are just along for the ride without any say. It sounds like we can tell it to do EM optimizations only? How?
Hi, If you have parametric em component on schematic you setup and run optimization then obviously it will run EM optimization as that's your circuit. Where is the confusion?
@@BhargavaAnurag You said be careful not to run optimizations blindly. Not sure what that means. Usually one would select the parameters to be optimized. So I misunderstood the comment.
@@rjrodrig What I meant by blind EM optimization was: 1. In normal circuit optimization things run very fast as you are using analytical models of the components so even if you are very far from your goal, it is always possible to come close to meet the goals within few mins. 2. In EM optimization case, it will run an EM simulation for every iteration so even if 1 EM sim takes only2 mins to finish, for 100 optimization iterations will end up taking ~200mins which is huge so you need to be sensitive to what point you really start the optimization. 3. If you are close to your goals then EM optimization will quickly bring you to the goal else it might be a very time-consuming process. 4. Also, before running EM optimization, you could try to run Parameter Sweep on the variable so that you can get a trend and get a sense of which parameter you really want to optimize to save unnecessary wastage of time in optimizing a parameter which really doesn't make any sense. Hope this clarifies.
At 16:35, you used a 70 ohm, 20 deg line for accomodating sma pin. What is the issue with taking 50 ohm, 20 deg line? And, how do we know that sma pin lead has width corresponding to 70 ohm ?
Its all about pre studying your material and knowing the limits and key impedances as per the stack up being used. You can take help of Line Calc to keep few numbers ready for your designs.
Switching to hole layer for drawing in layout has no dependency on the stackup but there is no fun doing that either as it will be ignored during simulation. 1. Right click on the stackup dielectric and select Map Conductor Via, it should by default be hole layer but if it is not then you can change it easily from the right hand side panel 2. In Layout window, simply look for the drop down menu with the layer name in the toolbar and select hole layer and draw the shape you want in the layout
Sir I have designed complete schematic of PA in ADS but when i generate layout I am not able to got correct layout as it have some lumped components also but distributed transmission lines are also not generated as in schematic..Please help me out how I can generate layout to perform em simulation. or I have to design my circuit in layout again but it’s very big circuit please guide me in best possible way and if i m doing some mistake in generation. Also suggest me how to use another method of place each component from schematic to layout. Thank you
Hi, You can use Place components from Schematic to Layout and place them 1 by 1. I will soon have a video on this topic in next 1-2 weeks which should be of your help.
@@BhargavaAnurag Please make video in detail sir, as one is doing first time EM co-simulation (having both lumped and distributed components in design) Thank you Sir.
Hi Garima, I would recommend you reach out to Keysight ADS tech support for help. If you are based in India then send a mail to eesof-europe_support@keysight.com or if you are in the US then send a mail to eesof-usa_support@keysight.com
@@BhargavaAnurag frequency Iam matching is 0.915 GHz and 2.45 GHz. I have matched 2.45 and I am confused with how to match 0.915GHz since the Smith chart can match only one frequency at a time.
@@Amruthappillai Yes, that is correct and limitation with Smith Chart in general. However, if you already the network that you would like to use then you can perform optimization and calculation etc directly in ADS schematic and don't need to restrict yourself with Smith Chart alone. I mean you can get the initial guidance from Smith Chart but then rely more on ADS schematic design to complete the matching network design.... Hope this helps.
Those tutorials are deserving more than 1000 likes.... Thank you Anunrag
Thank you so much 😀
Thank you so much for this great tutorial! I'm truly impressed by the clarity and depth of explanation
You're very welcome!
Very informative. I can't thank you enough sir. May God protect you
Glad it helped
Amazing tutorial. Thanks for taking the time to prepare all these wonderful videos!
Glad you like them!...👍
This tutorial is of great value. Thank you Sir, for blending your knowledge and methods to design something meaningful.
Glad it was helpful!
Anurag sir, this is one of the best tutorials for ADS. Covered so many unknown concepts of ADS, for me. I would have saved a lot of time if I had the access to this video a year before. Better late than never, I got to see this video. Thank you so much, sir. You are a virtual Guru for me.
You are most welcome and I am glad you liked it...Help me to spread the word about the channel in designer community and let's all learn together...!!
Since you've helped me so... so much, I'd like to give you a quick tip for sorting out all the working windows onto your screen underview.
Try windows+right (or left) to shift the selected window to the right half or right half of your screen, and upon further using down or up you can get the window to be quarter of the full working screen.
Thanks for the tip...👍I was only aware of drag & drop, this makes it simpler...😊
Could you please make a detailed tutorial video on PA design. Starting from the very basics- stability, load pull etc till DPD and real life signals. That would be immensely helpful. Your videos are the ones which “actually” teach something rather than giving a vague outline, which most other people do. I follow your tutorials very closely and have learnt a lot from them. Thank you sir.
Noted! Its on my to-do list however we have many videos to cover before we start talking about PA designs but it is surely in my list to do in near future....Stay tuned and keep learning & pass constructive feedback.
Appreciate your support...👍
Discussing on some practical points are really helpful. Adding LiineCalc toolbar is new to me. You told there are more features which you'll open up in upcoming videos.
These 140+ mins video on matching networks actually covered the every bits of the subject in real depth. Such kind of detailed and long video tutorials are much appreciated from learning point of view.
Hope to see such detailed demonstration on LNA with practical aspects in next tutorial series.
Hi Bhargav,
How could we include a capacitor dc block in to the interstage matching of a multistage amplifier
Hi Riju, Thanks for your comments. I will plan to have another video on LineCalc as there are many capabilities offered by the tool which designers may not know.
LNA design will also be covered in detail with practical aspects as well.
Hi Kishore,
While designing inter-stage matching networks using Smith Chart utility simply use a series capacitor along with rest of the transmission lines. There is nothing great about it....😊
Excellent tutorial.
Glad you liked it!
thank you again Sir for all really useful videos ..consider to organize a low price certification course ...thanx
Noted
Mr Anurag, you made small mistake when you translating transmission line to microstrip, you omitted frequency to be 6GHz, but you set it to 10GHz. Thanks for your great video.
The mistake was deliberate to see how many people catch it...😁
@@BhargavaAnurag I expected that, very useful video like graduating a course.!!!
@@BhargavaAnurag Love your response :) I have to pause to search for some comments to confirm the freq
Thank you so much for this video... could you please make a video on rectenna designing in ADS...
Please send me a link of any useful paper and I will try to create a video...👍
Outstanding job 👍.
Thank you very much!
Mr. Bhargava, when you converted the transmission lines, you used 10GHz instead of 6GHz. Just wanted to say the electrical length would have been different at that frequency. Overall, great video and very educational ! Much Appreciated!
My bad....thanks for catching it. Sometimes it happens when you create live recording video....😊 We always have optimization to our rescue....LOL..!!
I am glad you watched it carefully and liked it....
thanks so much that was awsome
Glad you liked it!
Best tutorials anyone can find. I was looking for broadband impedance matching for a long time. Thank you.
Sir, can you tell me where and how can we do connector to GCPW transition simulation for mm-wave frequency?
Hi Manisha,
You can use EMPro standalone simulate such structure and flow will be to export ADS Layout to EMPro and then add a SMA connector model to perform combined simulation.
As a 2nd option, you can bring in EMPro based 3D components such as SMA into ADS and then use the built-in FEM simulator to perform such analysis with great ease.
I have the plan to have such tutorials in the near future and you should see some of those after 15th Aug on my RUclips channel...
@@BhargavaAnurag Noted Sir, thank you
Thank you for the elaborate explanation sir. May i know if the procedures for the non uniform transmission line matching circuit is same as this?
I am not sure what is meant by non uniform transmission lines but largely the procedure will remain same.
Simply wow!! I've been using ADS for many purposes but this tutorial was simply amazing.
There is a one question. Doing impedance matching for small bandwidth is easier compared to wideband matching. I'm using multiple RF SMT components in series cascaded manner and when I cascade them, the overall return loss degrades despite the fact the their individual s-parameters are very good.
Nope my frequency is upto 26 GHz and I'm unable to control the return loss crossing 10 dB threshold even with matching techniques using radical stubs for wideband matching.
Any insight into this problem? Any literature, video, documents, books or anything related will be of great help.
Thanks once again for wonderful tutorial.
Hi Hamza,
Too many queries here but let me try to answer:
1. Thanks for your feedback and I am glad you liked it.
2. For wideband matching kindly see RF Design-7 tutorial. When overall return loss degrades that's where RF/uWave fun begins...😊 Kindly use SP_Probes to inspect impedances between network and try to approach your matching network design scientifically instead of using brute force.
3. When you say your frequency is upto 26GHz, I am not sure what are you using for fabrication as PCBs will have high loss and sensitivity to anything above 18GHz so things will get very tricky. Using distributed matching is one of the option but you will need to use something like 5mil or 10mil (max) substrate to avoid radiations and etching high impedance lines on such substrate would be quite challenging.
Best of Luck...
@@BhargavaAnurag I appreciate you replying our comments and that's encouraging 😊.
Yes, I'm using 5 mil substrate with 50 micron lines accuracy.
I'll go through the tutorial and methods you mentioned and hopefully it'll help as always.
Thanks again 😊
Can't thank enough sir...plz help us in designing a UWB rectenna impedance matching
Amazing video! I'd like to ask for your opinion on what should I do if I want to simply just set the microstrip line between two components without considering about matching? How should I set the dimensions of the lines?
Hi Pay,
Usually we prefer using a 50Ohm line to connect between components and you can calculate the width of 50Ohm line using Line Calc depending on the substrate properties.
Hope this helps...👍
@@BhargavaAnurag It's clear, thank you very much for your reply!
Good day sir, thank you for your effort for making such informative videos! May I know if it’s possible to add components soldering pads to the layout of the circuit before exporting it into a gerber file?
Yes, you can and you need to map it like any other conductor layer or footprint.
Dear Anurag, thank you for the valuable video. Could you help me find one video where you do match the s2p models of 2 cascaded filters? I believe it was on your channel but I cannot find it. Many thanks
Hi Artur, That is just 1 before this video i.e. RF Design-7 video: ruclips.net/video/XpR6uoKYfF4/видео.html
Hope this helps...
Thank you so much for the quick reply.
great video tutorial sir ,
my question is that , during the process of impedance matching , instead of using the smith chart method , can we use optimization cockpit for the same by assigning 2 stubs and a transmission line, all of random length while keeping the width constant for the required frequency of operation ( w calculated using line cal) . After that we can assign the goals required for optimal gain and minimum return loss , then just run the optimization cockpit. ???
Hi Vineeth,
Yes, the approach you said will work and for that you don't need to even use LineCalc...Experienced designers do so because when you have a sense of what will take to do impedance match then you can simply reuse previously designed networks and optimize its performance to suit your applications. I will cover those techniques in future tutorials.
@@BhargavaAnurag thanks a lot for the clarification sir :)
I’m trying to match a broad band antenna but the smith chart tool only tunes one frequency. I’m trying to explore alternative cosim strategies but nothing is giving a good impedance in broadband. I’m matching 617mhz to 5GHz and the antenna is very high impedance at low band. Do you have any advice? I appreciate your tips here but I’m not able to implement them for my purpose, other than possibly redesigning my antenna
Sir, I have a doubt, if the width can't be increased beyond 3mm(Z0 = 24.57) then the limit on Z0 will be 25 and not 24 , because to get Z0 = 24, we should increase width further.
Usually it is never a problem for fabricator to print lines as wide as you want so there shouldn't be any concern. Even if it is a concern for you due to overall size etc then also you can design circuits within the constraints you have.
please tell me, Is the fabrication process of antenna and (impedance matching plus rectifier circuit) different?
I am not pretty sure if I got this question correctly but if you are asking about the PCB fabrication then yes, it is exactly the same process.
Hello sir, where can I find the video to design the DC feed network as you did in the LNA tutorial?? Thank You.
I thought I covered it in great details during the LNA design video itself...its pretty simple and you can look at the details I provided in the LNA design video
Mr. Bhargava, can you please make a detailed tutorail on how to deal with antenna efficiency, specially in low franquancies? Thank you
Sir can matching of multiband frequencies be done using smith chart utility?
Hi,
You can't use Smith Chart utility but you could do it using regular ADS capabilities
At 25:12 once you select "Send selected component to LineCal" . Freq(Component parameter) changes from 6GHz to 10GHz. Will it not create ant effect ??
Helpful videos sir. I have a query sir, can we build a matching circuit without using smith chart. I am trying to design from a paper where the matching circuit is built using microstrip components such as MBSTUB, MTaper,etc
Smith Chart makes it easier to visualize how your matching components transforms the impedance when you add different components. If you already have the right network topology then you can simply use optimization feature in the software to achieve the needed impedance without using Smith Chart.
Hi Mr. Anurag, I really enjoy your video tutorials, it is very helpful ^^ What is the Layout Units/ Resolutions settings that you are using? I couldn’t get my circuit to fit perfectly like yours even though my microstrip lines dimension are similar to yours... /.\
For these kind of designs I always use 'mm' with default database resolution nothing very special...
Perfect
Glad you liked it....👍
Hi Anurag, When using the microstrip Tee junction model, I get warnings saying that I have violated the largest width to smallest width ratio for the model. This is a result of having generated an optimized impedance matching network. Should I ignore these errors and proceed to layout? Or, should I allow this constraint to dictate how good of an impedance match I can achieve?
Hi Abraham,
Schematic discontinuity models use analytical equation in Schematic which has their limits to maintain the accuracy of the formulation or the assumption they are build upon and usually for models such as TEE and STEP etc it is 1:5 or 1:10 ratio that they recommend, if you cross that then you will see these kind of warnings in the simulation status. You can ignore them and your simulation will surely run but it is telling you that if there is any reflection happening at that junction it will not be accurately captured in your circuit simulation and when you perform EM simulation you will see increased discrepancy between schematic and EM results.
EM simulator are physics based so they don't have any limitations for the width ratio at junctions and will capture any distortion caused due to high width mismatch.
Personally, I never like to have this kind of situation as it is not a good design practice (however no one is stopping you in having these in your designs) and if I see this situation after optimization then I will try to create a stepped impedance section for that transition e.g. you can go from 0.2mm width to 0.8mm and then eventually to 3mm instead of directly connecting 0.2mm wide line to 3mm line as then the impedance mismatch will be too high and bigger reflections will surely happen depending on dielectric material and frequency of operation.
Hope this helps in some manner?
@@BhargavaAnurag Thanks Anurag! Yes, this helps.
What can you do when you're using a PDK which doesn't appear in the Line Calc. tool for substrate definitions? How can you convert TLIN elements to MLIN which are in the PDK?
Hi,
I couldn't understand the exact query. You normally don't use LineCalc for PDK as design manual might provide 50Ohm width already and in some PDK when you change the width it shows the impedance in the dialog box itself. If none of that works then you can simply create a schematic template with 2 50 Ohm terminations, place you line and make width to be optimizable with S11 optimization goal as better than -40dB or so and ADS will let you know what width value provides the best matching and that's your 50Ohm width. If you need any other impedance than 50Ohm then simply change the terminations value to that number and run optimization to obtain width value for that impedance.
Hope this helps...
I am following your video and it’s being very helpful. Can you please help me if I want to design input and output matching network only with MLIN transmission line without using MLOC lines .It will be great help. Thanks in advance.
Hi,
That will depend on the impedances that you want to match and may not be always possible. You can the Smith Chart tool so feel free to try out whatever topology you want and play with the impedance of the lines to adjust the locus and drive it to the desired point as per your requirements.
@@BhargavaAnurag Thank you Sir . I will try for same. Please can you make one video on load pull simulation using ADS in correct manner because your videos are very clear and show the right path.Thank you.
Thank you so much for this valuable video.
Please, after we design this on ADS and fabricate the circuit, we need to add an SMA to connect it to a coaxial cable, and this will change the circuit. Then, can you explain how to remove the effect of adding an SMA in the circuit to obtain similarity between measured and simulated results (Signal integrity)?
Thank you again.
Hi Melad,
There can be multiple approaches:
1. First you need to ensure Calibration was done on VNA, that will take care of the cable part reaching up to the connector on your board.
2. To model connector, you can cascade the S2P file of the connector alongwith ADS results to see overall behavior.
3. You can add 3D connector model of the connector and perform full 3D EM simulation to get results upto the connector output side.
4. Deembbed connector during your VNA measurements
Anurag Bhargava
Thank you so much for your reply.
Hopefully you have the time to do a demonstration video about those practical methods.
Thanks again
How to determine the input for the MSub.? where to get those input (reference).?
MSUB parameters depends on the substrate/PCB you want to use for your design and manufacturer datasheet will provide all the required values.
Nice work. Does a diode(SMS7630, HSMS XXXX series have footprint in ADS? If yes how can I get them to convert my schematic to layout
Kindly watch the video on Layout footprint etc under Learn ADS in 5mins playlist. Its very easy to create a footprint and associate it to any component you have in your schematic design.
Good I got it. I have a purely imaginary load. When I put in smith chart it says real part must not be zero. what do I do?
Hello Sir, can you tell me the Height of rogers RO3003 ?
They are available in variety of heights like 10mil, 15mil, 20mil etc. You can check on Rogers website.
How would you optimize the actual layout using the optimizer in ADS? Do you need to parameterize every p-cell txline in layout? Can you show how?
Hi,
Kindly see this video i.e. Tutorial-26 under Learn ADS in 5mins playlist: ruclips.net/video/HsZXTfB8SWg/видео.html
There I ran a parameter sweep but you could run Optimization in schematic. Be careful in not running optimization blindly in EM cases and I always prefer to run nested parameter sweeps and then turn on the interpolation in EM models to arrive at optimum values via optimization.
@@BhargavaAnurag thank you I will check that. Also what setting do I change to prevent it from doing that? I thought that is all code running in the background and we are just along for the ride without any say. It sounds like we can tell it to do EM optimizations only? How?
Hi,
If you have parametric em component on schematic you setup and run optimization then obviously it will run EM optimization as that's your circuit. Where is the confusion?
@@BhargavaAnurag You said be careful not to run optimizations blindly. Not sure what that means. Usually one would select the parameters to be optimized. So I misunderstood the comment.
@@rjrodrig What I meant by blind EM optimization was:
1. In normal circuit optimization things run very fast as you are using analytical models of the components so even if you are very far from your goal, it is always possible to come close to meet the goals within few mins.
2. In EM optimization case, it will run an EM simulation for every iteration so even if 1 EM sim takes only2 mins to finish, for 100 optimization iterations will end up taking ~200mins which is huge so you need to be sensitive to what point you really start the optimization.
3. If you are close to your goals then EM optimization will quickly bring you to the goal else it might be a very time-consuming process.
4. Also, before running EM optimization, you could try to run Parameter Sweep on the variable so that you can get a trend and get a sense of which parameter you really want to optimize to save unnecessary wastage of time in optimizing a parameter which really doesn't make any sense.
Hope this clarifies.
At 16:35, you used a 70 ohm, 20 deg line for accomodating sma pin. What is the issue with taking 50 ohm, 20 deg line? And, how do we know that sma pin lead has width corresponding to 70 ohm ?
Its all about pre studying your material and knowing the limits and key impedances as per the stack up being used. You can take help of Line Calc to keep few numbers ready for your designs.
Sir, there is no hole layer in the stack up so i couldnt switch the entry layer to hole.
Switching to hole layer for drawing in layout has no dependency on the stackup but there is no fun doing that either as it will be ignored during simulation.
1. Right click on the stackup dielectric and select Map Conductor Via, it should by default be hole layer but if it is not then you can change it easily from the right hand side panel
2. In Layout window, simply look for the drop down menu with the layer name in the toolbar and select hole layer and draw the shape you want in the layout
Sir I have designed complete schematic of PA in ADS but when i generate layout I am not able to got correct layout as it have some lumped components also but distributed transmission lines are also not generated as in schematic..Please help me out how I can generate layout to perform em simulation.
or I have to design my circuit in layout again but it’s very big circuit please guide me in best possible way and if i m doing some mistake in generation.
Also suggest me how to use another method of place each component from schematic to layout.
Thank you
Hi,
You can use Place components from Schematic to Layout and place them 1 by 1. I will soon have a video on this topic in next 1-2 weeks which should be of your help.
@@BhargavaAnurag Please make video in detail sir, as one is doing first time EM co-simulation (having both lumped and distributed components in design)
Thank you Sir.
Its already there on my channel. Look for EM Circuit Cosimulation video and that explains all the details necessary for beginners.
Thanks a lot, Sir. When I click "Send Selected Component to LineCalc", LineCalc is not receiving anything? help, please..
Its difficult to imagine what could be wrong by looking at simple message. Kindly contact your local Keysight tech support team for help
@@BhargavaAnurag Thanks a lot, Sir..
CAN U PLEASE PROVIDE S2P FILE
There is nothing special in the S2P file I used, you can use any S2P file that is not matched to 50Ohm already...😊
How to limit the bandwidth of error amplifier in control loop of buck converter in ADS?
Hi Garima, I would recommend you reach out to Keysight ADS tech support for help. If you are based in India then send a mail to eesof-europe_support@keysight.com or if you are in the US then send a mail to eesof-usa_support@keysight.com
How can I match two frequencies.
You can match any number of frequencies with the proper simulation setup and optimization bench as long as you have the right network model in place.
@@BhargavaAnurag frequency Iam matching is 0.915 GHz and 2.45 GHz. I have matched 2.45 and I am confused with how to match 0.915GHz since the Smith chart can match only one frequency at a time.
@@Amruthappillai Yes, that is correct and limitation with Smith Chart in general. However, if you already the network that you would like to use then you can perform optimization and calculation etc directly in ADS schematic and don't need to restrict yourself with Smith Chart alone. I mean you can get the initial guidance from Smith Chart but then rely more on ADS schematic design to complete the matching network design....
Hope this helps.
You calculated the lines in Lincalc with 10Ghz instead of right frequency
Correct...you can say it was done to see how many people notice that comment on the video....Thanks for paying the attention..😊
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