How to Find amplitude and phase of IM3 signal with respect to fundamental tones

3 views (last 30 days)
Hello Everyone, i am doing two tone characterization of power amplifier.after giving the 2 tone input signal to amplifier i have had a output signal with two tones and IM products. i am interested in lower and upper IM3 products.i want to know that how i can calculate the amplitude and phase of IM3 products with respect to fundamental tones.i am plotting the signal in frequency domain.you can find the output signal "y2s" in attachment. >> fs=40e6; >> N=20e3; >> plot(-fs/2:fs/N:fs/2-fs/N,db(fftshift(fft(y2s))));
  2 Comments
Star Strider
Star Strider on 15 Apr 2014
Edited: Star Strider on 15 Apr 2014
When I plot it, your ‘y2s’ data looks strange. Is it the fft of your signal, or something else?
Lilly
Lilly on 16 Apr 2014
yes it is the fft of my signal. now i attach the fft of output signal.Are you getting fig like this?

Sign in to comment.

Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!