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

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Zainab Riyadh
Zainab Riyadh about 8 hours 前
回答： Aditya about 8 hours 前
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?

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回答（1 个）

Aditya
Aditya about 8 hours 前
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.

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