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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.
It's not clear what you're asking here. It sounds as if you're asking how the simulator works - if so, I don't see how that helps you understand how the input impedance behaves - so something is not clear. Please clarify.
In reply to Andrew Beckett:
thank you andrew for your response.
actually, the results i got, show that the input impedance is a function of the source impedance (the impedance of the port), so there is to possible response:
the psp is not the good analisys i have to run,
or the input impedance do really change with the source resistance ( it's the first time i'm seeing someting like that)
so my question was to know wich is the good response to my problem.
In reply to Reda21:
Let's define the question a bit more...it's not entirely clear what you are measuring and why you're using psp analysis for this. What kind of circuit is this? If you can use sp analysis, it's much easier to use/understand. Say you have a 2 port circuit. If you want to look at input impedance, then S11 is what I would plot.
You may want to look at Article 11663828 Location of tutorials/information on Spectre sp and SpectreRF psp analyses on Cadence Online Support.
Reda21 thank you andrew for your response. actually, the results i got, show that the input impedance is a function of the source impedance (the impedance of the port), so there is to possible response: the psp is not the good analisys i have to run, or the input impedance do really change with the source resistance ( it's the first time i'm seeing someting like that) so my question was to know wich is the good response to my problem.
Customer Support Director - Analog/Mixed-Signal/RF AEs
Cadence Design Systems, Inc.