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Switched-cap filter simulation problem

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qianterry

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Dear all:
It was my first time to design a switched-cap Lowpass filter.
After obtaining the poles and zeros in MATLAB, I used SWITCAP & Cadence Spectre RF (PSS PAC) doing behavioral simulation. However , I found in my design,both the results in SWITCAP and Cadence showed the filter pass band gain was related to the gain of the ideal opamp (and it reached as large as 200db),obviously there may be something in my design,what kind of problem may be?

Thanks ^_^
 

nonlinearity in op-amp

auto-zero technique may help

check out this article:
**broken link removed**
 

qianterry said:
Dear all:
............
............. the filter pass band gain was related to the gain of the ideal opamp (and it reached as large as 200db),obviously there may be something in my design,what kind of problem may be?
Thanks ^_^
Click to expand...

If the pass band gain is dependent on some opamp parameters there might be a lot of reasons - perhaps the opamp slew rate or the gain-bandwidth product ?
However, it sounds confusing that the gain reached 200 dB ! Rather, I expect any systematic error in your circuitry.
 

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