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

[nannapaneni]

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]

You can simulate it in LTspice, a free analog simulator from Linear Technology.

 

[nannapaneni]

You can simulate it in LTspice, a free analog simulator from Linear Technology.

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

 

[FvM]

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.

 

[nannapaneni]

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

 

[LvW]

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.

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.