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PSS/PAC for Switched Capacitor Filters in Cadence Spectre

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Puppet123

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I am doing Switched Capacitor Filter design using Cadence Spectre.

After I replace ideal switches with switched capacitor clocked circuits and simulation using PSS/PAS the filter response is not as accurate as with ideal switches.

Should I increase the number of harmonics/sidebands using by PSS or PAC - or how do I solve this issue?
 

If switch resistance is relatively large it will bring to a more exponential settling which in turn will degrade or cause steeper roll-off in your filter frequency response.
 
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