Hi guys. I have to compare mixer circuits for demodulation for a uni assignment.
One of the questions asks the average power of the demodulated signal in the 0-50MHz range, so I built the circuit in LTspice and took the FFT of the demodulated signal. For a trace in the time domain, I can get the average and RMS values by holding Ctrl and clicking on the trace name, but in the FFT it gives a different set of measurements (see attached screenshot).
I've tried googling, but I don't understand how to get the average power over a certain range in the frequency domain. Any help or advice will be greatly appreciated.
Thanks.
One of the questions asks the average power of the demodulated signal in the 0-50MHz range, so I built the circuit in LTspice and took the FFT of the demodulated signal. For a trace in the time domain, I can get the average and RMS values by holding Ctrl and clicking on the trace name, but in the FFT it gives a different set of measurements (see attached screenshot).
I've tried googling, but I don't understand how to get the average power over a certain range in the frequency domain. Any help or advice will be greatly appreciated.
Thanks.
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