This is good method to consider when calculating response for sine wave (single harmonic). However, in my case I have complex wave form due to rectification and exponential rise and decay
wondering how I could improve or choose them properly
at which point would my output be distorted.
So, in picture "1" I have my rectified waveform and envelope I am interested in
1st has to be passive no spare op-amps in circuit. Preferably 2nd order.
Ripple of about 5mV
Last and very important constrain is time constant of a filter. Since my goal is to have steep slope as this reduces my error.
at which point would my output be distorted
Lastly how can I measure frequency of modulating signal?