I'm trying to make a peak hold circuit for a very high frequency bandpass filter that needs to be able to operate at 16 Mhz, 40 Mhz, and 48 Mhz.
I've singled out the peak hold part of my overall circuit to try to get it to work. Here's the one I'm currently trying, which isn't working:
Here(below) is the rest of the circuit with one of the other peak hold circuits I tried using (also doesn't work.) The circuit is supposed to take in a frequency and determine whether or not it is within ~500 kHz of 16 Mhz. I'm using a 2nd order Chebshev resonant frequency filter as a bandpass for the incomming signal, then I'd like to use a peak hold circuit to get the amplitude of it before pushing it to a comparator, which will determine if it is within the desired frequency. If there is a easier way to approach this that doesn't involve and FPGA, that will work as well.
I was mainly wondering if there are other peak hold circuits that will work at high frequencies (16, 40 and 48 MHz.) I've tried other circuits with BJTs and they haven't worked either. Do the OP amps I have selected have anything to do with these problems?