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Subject: Re: Frequency Comparison Device

Date: 09/17/02 at 7:53 PM
Posted by: Russ Kincaid
E-mail: russlk@netzero.com
Message Posted:

In Reply to: Frequency Comparison Device posted by Steven Louis on 09/17/02 at 1:52 PM:

It is called a frequency discriminator. Most IC discriminators require tuned circuits and operate over a limite frequency range.

For a wide band discriminator, try this:
Feed the two frequencies to the set and reset inputs of a flip-flop. Filter the Q and NOT-Q outputs to DC. Apply the DC to the inputs of a comparator, Q output to the plus input, NOT-Q output to the minus input. The comparator output will be high when the frequency at the set input is higher than at the reset input and low when the frequency at the reset input is higher than the set input.


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