How to plot AM/AM and AM/PM Characteristic using input and output baseband signals?

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Zainab Riyadh
Zainab Riyadh 2024-11-21
评论： Laxmikant 2025-1-17
I have .txt files that contain complex input and output baseband signals of an amplifier. I need to plot the AM/AM (magnitude of Gain vs. Input power) and AM/PM (phase of Gain vs. Input power) Characteristic.
% Calculate input and output power
P_in = 30 + 10*log10( (abs(x_in).^2)/100); % x_in is the input baseband signal
P_out = 30 + 10*log10((abs(x_out).^2)/100); % x_out is the output baseband signal
% Calculate gain
Mag_Gain = P_out - P_in;
Phase_Gain = rad2deg((angle(x_out) - angle(x_in)));
% Then I plot the AM/AM and AM/PM curves
% however the results does not match with the theoretical results.
% Is the way for calculating the power correct?
  1 个评论
Laxmikant
Laxmikant 2025-1-17
Hi Zainab,
Have you find the right way to to get AM-AM plot and AM-PM plot?
could you share your result?
I also have PA input singal and output signal from PA but not sure I am doing things in right way or not. My AM-AM plot is spread over large area.
Thank you.

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采纳的回答

Aditya
Aditya 2024-11-21
Hi Zainab,
There's limited information to fully address your query, but from the equations you've shared, your calculations for power seem correct. Here are a few things you might consider to resolve the issue:
  1. Check Unit Consistency: Ensure that all units (e.g., dBm, dB) are consistent throughout your calculations.
  2. MATLAB Central Resource: You might find this MATLAB Central File Exchange post helpful: https://www.mathworks.com/matlabcentral/fileexchange/173930-plots-am-am-and-am-pm?s_tid=answers_rc2-1_p4_MLT
If this doesn't resolve the issue, please attach the output that you are getting and the theoretical output.
  1 个评论
Zainab Riyadh
Zainab Riyadh 2024-11-23
编辑：Zainab Riyadh 2024-11-23
Thank you for your response.
Is there documentation for building digital predistortion Lookup tables based on LUT of the PA and gain?

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