At 10:52 on IdVds plot breakdown voltage is lower for higher power - it might be other way around for GaN (no punchthrough) as increased temperature (=>scattering) slows down electrons and shifts avalanche towards higher Vds. Thanks a lot for the great lectures!
Hi Dr. Hajimiri!, I am working on a RF card, the final PA is Doherty power amplifier. When I provide dc bias to the main and peak, quiescent current is rapidly shooting up and going over limit. I have tried increasing the contact between the PCB and heatsink(thermal paste, screws etc. )What possible techniques can I use for debugging this issue?Kindly suggest.
I have some problems!!! How rf power amplifier works I have a walkie talkie that have a rf power amplifier module inside and powered by 7.5v and have 5watts of power into the antenna How this is happening? We know our antenna have a impedance of 50 ohm so if: I = v÷r P= v × I I= 7.5v ÷ 50ohm=150mA P=7.5v×150mA=1.12 watts So why ican see 5watts in my power meter
A tremendous knowledge is hidden in His every single phrase. Thank you Professor, I finally learned what I wanted to learn.
We love you Dr. Hajimiri!
Please just don't stop uploading.
We are waiting for your other lectures...
شما باعث افتخار ما هستین . مرسی از آموزش واضح تون
What a nice surprise this morning receiving a notification that a new video had been posted! 😊 👍🏼
Thanks, Prof. it’s really awesome lecture for the intro to RF PA with hidden details including in the general concept.
love ur lectures so much. Just can‘t wait for news.
At 10:52 on IdVds plot breakdown voltage is lower for higher power - it might be other way around for GaN (no punchthrough) as increased temperature (=>scattering) slows down electrons and shifts avalanche towards higher Vds. Thanks a lot for the great lectures!
kinda wait for new lectures rn!
best teacher,,,, thank you sir for sharing valuable information
Thank you so much for this free video
Fantastic lecture, I could not surrender the RF engineering to my research proposal , if meet this video earlier. ......TOO BAD !!!!
Thanks for the great intro! 42:57 it is a little bit strange that Vcas>Vbat, or is there any intention for that?
i need new lectures :( :( :(
What is the minimum value of the DC biasing current in class A output stage?Explain you answer
Ali, 永远的神
Drain efficiency for a wire is infinity
actually when we will get next lecture?
What is the significance of seeing the Pout * Breakdown parameter? What conclusion can be drawn from it? @timestamp: 27:09
I wonder what happen now with no new lectures :(
hi! where is lecture 189? continuation of the lecture on rf amplifiers ?
❤❤❤🎉🎉🎉
i guess there will be no RF series lectures anymore, it makes a lot of difference to just read PDF's and didn't get extras from lectures :(
Hi Dr. Hajimiri!, I am working on a RF card, the final PA is Doherty power amplifier. When I provide dc bias to the main and peak, quiescent current is rapidly shooting up and going over limit. I have tried increasing the contact between the PCB and heatsink(thermal paste, screws etc. )What possible techniques can I use for debugging this issue?Kindly suggest.
Where can I goto to get an education in RF? Will a degree in general electrical engineering get me there or are there specific schools one can attend?
What about switching losses?
I have some problems!!!
How rf power amplifier works
I have a walkie talkie that have a rf power amplifier module inside and powered by 7.5v and have 5watts of power into the antenna
How this is happening?
We know our antenna have a impedance of 50 ohm so if:
I = v÷r
P= v × I
I= 7.5v ÷ 50ohm=150mA
P=7.5v×150mA=1.12 watts
So why ican see 5watts in my power meter
its already 6 months and there's no new RF lectures :(
Where is my popcorn (*-*)
189N?
@timestamp 42:57