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Need help on switched capacitor filter simulation

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shyboy

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switched capacitor filter model simulation

Hi, all,

I am running a simulation on a switched capacitor lowpass filter using Spectre...The analyses i am running are PSS followed by a PAC. And the input signal is a dc source with a dc level of 1V and PAC of 1V...The problem is that, i observe almost no signal at the filter output...
I guess i probably did not give the correct input signal...Can anyone tell me if the input signal setting is correct or not? if not, what kind of input signal shall i use to test my SC filter?

Any instruction will be appreciated...

shyboy
 

switched capacitor filter simulation

Can you post more specific problem description? Probably you have not set the PSS and PAC setting correctly.
 
switched capacitor filter simulation

I suggest you read P ellen's book and/or notes from his website w3.aicdesign.org. He gives excellent PSpice examples on SC filters and their simulations.
 
simulation of switched capacitor filters

If you're using SpectreRF (PSS, PAC, PNoise) - read Ken Kundert's article about SC filter simulation at www.designers-guide.com

There's a perfect explanaition how it works with examples (even examples' netlitst are provided)

P.S. it's hard to help you without seeing your netlist.. hope Kundert's paper will help you.
 

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