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Re: A SIMULATION OF THE SC FILTER (Read 3020 times)
Ken Kundert
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Silicon Valley
Re: A SIMULATION OF THE SC FILTER
Nov 17th, 2003, 7:43pm
 
You cannot see the transfer function of a switched-capacitor filter using AC analysis. The switches do not switch in an AC analysis because it first linearizes the circuit about the DC operating point. The filter should work properly in transient analysis, but it is difficult to see the bandpass nature.

Consider using the PSS/PAC analyses of SpectreRF. Read "Simulating switched-capacitor filters with SpectreRF" for a description of how to do this. It can be found at http://www.designers-guide.com/Analysis/.

-Ken
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