help needed in measuring frequency responce of switched R high pass filter

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nannapaneni

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I want to design 100Hz high pass filter for some application.Normally for a corner frequency of 100Hz and R=750kOhm a capacitor of 2nF is needed. By switching the resistors on by a factor of 1/99 period of the conversion period a capacitor of 21pF is needed. This is a practical value that can be integrated on chip.

I want to simulate the frequency response of above filter, somebody help me
 

crutschow said:
You can simulate it in LTspice, a free analog simulator from Linear Technology.
Click to expand...

I want to simulate using spectre, using PSS+PAC(if possible)/other analysis.
I don't know what inputs to specify for simulator to check filter frequency response
 

I think that a SC filter implementation promises better performance, but simulation methods are about the same.

You can't model a switched system in AC analysis, you have to refer to transient analysis. Unfortunately noise isn't modelled in this case.
 

I am done with the analysis using PSS+PAC anaysis.
spectre RF user guide helps lot
 


For switched capacitor circuits there are some techniques to replace the switched unit by a time continuous equivalent - suitable for errorless ac analyses.
However, I don`t know how this is possible for switched resistor circuits.
 

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