188N. Intro. to RF power amplifiers

Analog Circuit Design (New 2019)
Professor Ali Hajimiri
California Institute of Technology (Caltech)
chic.caltech.edu/hajimiri/
© Copyright, Ali Hajimiri

[@mohammadr797]

We love you Dr. Hajimiri! Please just don't stop uploading. We are waiting for your other lectures...

[@joseruicustodio1894]

What a nice surprise this morning receiving a notification that a new video had been posted! 😊 👍🏼

[@Muhammadali-jd6td]

A tremendous knowledge is hidden in His every single phrase. Thank you Professor, I finally learned what I wanted to learn.

[@dariushmadadi8482]

شما باعث افتخار ما هستین . مرسی از آموزش واضح تون

[@soumenmohapatra4242]

Thank you so much for this free video

[@QiuLuo-3088]

love ur lectures so much. Just can‘t wait for news.

[@briankopo2783]

Thanks, Prof. it’s really awesome lecture for the intro to RF PA with hidden details including in the general concept.

[@olegtokmakov]

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!

[@rahultheytv5347]

best teacher,,,, thank you sir for sharing valuable information

[@1412dante]

kinda wait for new lectures rn!

[@user-ss8ps5wk3c]

Ali, 永远的神

[@nivitahgf]

Fantastic lecture, I could not surrender the RF engineering to my research proposal , if meet this video earlier. ......TOO BAD !!!!

[@deep6431]

Thanks for the great intro! 42:57 it is a little bit strange that Vcas>Vbat, or is there any intention for that?

[@user-vj5wd6wq1v]

What is the minimum value of the DC biasing current in class A output stage?Explain you answer

[@shivangisinha9198]

What is the significance of seeing the Pout * Breakdown parameter? What conclusion can be drawn from it? @timestamp: 27:09

[@karwan6995]

❤❤❤🎉🎉🎉

[@1412dante]

actually when we will get next lecture?

[@nimishasusan7958]

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.

[@ironmank9554]

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?

[@1412dante]

i need new lectures :( :( :(

[@1412dante]

I wonder what happen now with no new lectures :(

[@ahbushnell1]

What about switching losses?

[@user-rq4sg5qv2q]

hi! where is lecture 189? continuation of the lecture on rf amplifiers ?

[@coolwinder]

Where is my popcorn (*-*)

[@1412dante]

its already 6 months and there's no new RF lectures :(

[@1412dante]

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 :(

[@dannybeckett01]

189N?

[@Ruman87]

Drain efficiency for a wire is infinity

[@ltlt6117]

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

[@balasubrahmanyamp6406]

@timestamp 42:57