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how cadence do to calculate Z11 in a psp analysis

Reda21

hi,   

i'm simuliting a circuit, where i connect 4 switching caps to the port, than i run a psp annalysis to get the input impedance"Z11", and i want to know how spectre do to give such result, it's for helping me understandind how the input impedance behave.

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  • If there is a large signal clock that drives those switches then psp is the right choice. And yes sometimes the input impedance does depend on the source impedance, such as the input impedance of a passive mixer driven by large LO signals which is probably similar to your case here. This is because the up/down converted impedance at the output of the mixer is affected by the impedance seen at the source.
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  • If there is a large signal clock that drives those switches then psp is the right choice. And yes sometimes the input impedance does depend on the source impedance, such as the input impedance of a passive mixer driven by large LO signals which is probably similar to your case here. This is because the up/down converted impedance at the output of the mixer is affected by the impedance seen at the source.
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