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Subject: Frequency Detector

Date: 11/25/01 at 10:55 PM
Posted by: Arun Sharma
E-mail: analog_arun@yahoo.com
Message Posted:

Hi,

I am looking for a freq. detector circuit. My requiremnet is like to set a flag.If freq is less then 48KHz flag should be zero and if its greater than 90Khz flag should be set to one. User will make it sure that incoming freq. is either less the 48 or greater than 90. so I can do it very well by just comparing the incoming freq, with some ref. freq. Only problem is that i dont have any ref. freq. Is it be possible in some way that i dont need to generate a ref freq.
If inpur freq. is Fs the freq. available to me are Fs, 2*Fs and 4*Fs. can someone suggest me a logic for that.
suggestions are most welcome.


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