Hi all,
actually i need frequency response of SC filter from an impulse ....so what i do is for a 1.2V Sc filter i give an impulse of height 1.2V(0-1.2V) for one clk cycle to sample and then keep it zero...so i get the output response which goes to negative side also....now in general circuit components won't operate that way....so for that case how to get frequency response...
thanks a lot....
Manodipan

Manopidan,

I mistakenly assumed your question was about designing or modifying switched cap filters.  When I posted my reply and backed out to the forum I then noticed your question appears in "Other Measurements". Let me revise my answer by posing a question:

Is your measurement intended for production automated test equipment (ATE) or for laboratory analysis?

For ATE I would suggest creating a "multi-tone" comprising frequencies below, near, and above the corner frequency.  Choosing your test frequencies so they are related to your sampling frequency will give you very sharp frequency bin separation and eliminate the need for windowing.  Ask your ATE vendor's FAE for details.  (But now I wonder if capturing and checking a step response would provide adequate functional coverage, with shorter test time, for production testing?  Related to my initial response.)

For laboratory analysis, I would suggest using a swept frequency source and a scope.  Or you could do the same as in the ATE test using an arbitrary waveform generator and a spectrum analyzer.

Hope this is more helpful.

Bob P.
www.RPeruzzi.com

Hi,
thanks for your nice reply.....actually i want to know that the opamps have some output range and due to that reason if we give an impulseof height =supply voltage,it may not give me proper samples thus leading to improper frequency response.....also for testing we can use this method to determine freq response using this method than using a swept frequency signal generator.......

I think frequency response of an amplifier makes sense only when all the transistors are in sturation region.  For this input swing should be smaller than input differntial range of an amplifier.

It is not clear to me whether you are trying see frequency response in simulation or in experimental set up.

Regards
CA