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  1. #1
    Newbie level 5
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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?

    •   Alt12th September 2006, 10:21

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  2. #2
    Full Member level 4
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    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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