Max Input Frequency

Thread Starter

olvine

Joined Mar 10, 2014
99
I know ADC is not a good method for frequency and because of that I have used comparator and timer to do the job.
All I am saying that if the maximum limit of any controller's analog pin for both comparator and ADC is, lets say 20kHz(nyquist theorem applied) , then can I measure any analog signal with frequency more than 20kHz using anything within the controller or using programming logic. Because now comparator or ADC will miss the waveforms as the frequency increase.
This is all that I am asking..

@THE_RB, I have to do different tasks. Input sine wave of any frequency then measure its frequency and amplitude. Then I have to do PWM according to that input signal.
 
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