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How to design a frequency sensor to detect signal frequency

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keithma

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sensor design

Hellow, everyone!
I want to design a frequency sensor to detect the signal frequecy. When the frequency is lower than 3M, the sensor will work to alarm. Because there is no reference clock , so the counter-based method will not work here. I decide to first change the frequency into voltage with a charge integration circuits , and then compare the voltage with a reference voltage coressponding to 3M. But because of charge injection this method is not so accurate. Any one with good idea?
 

Re: sensor design

What accuracy do you need?
Why can't you use an oscillator/counter?
There are chips with the oscillator built into the counter.
 

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