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
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What a nice surprise this morning receiving a notification that a new video had been posted! 😊 👍🏼
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
love ur lectures so much. Just can‘t wait for news.
Thanks, Prof. it’s really awesome lecture for the intro to RF PA with hidden details including in the general concept.
Thank you so much for this free video
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!
best teacher,,,, thank you sir for sharing valuable information
Ali, 永远的神
kinda wait for new lectures rn!
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?
What is the minimum value of the DC biasing current in class A output stage?Explain you answer
actually when we will get next lecture?
❤❤❤🎉🎉🎉
i need new lectures :( :( :(
I wonder what happen now with no new lectures :(
What is the significance of seeing the Pout * Breakdown parameter? What conclusion can be drawn from it? @timestamp: 27:09
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?
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.
What about switching losses?
Drain efficiency for a wire is infinity
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 :(
its already 6 months and there's no new RF lectures :(
Where is my popcorn (*-*)
hi! where is lecture 189? continuation of the lecture on rf amplifiers ?
189N?
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
@timestamp 42:57