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Desired signal @ small offset from LO in PSS (Read 1870 times)

schehrazi

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Posts: 45
University of CA, LA

Desired signal @ small offset from LO in PSS
Oct 31^st, 2005, 10:20am

Hi,

I am trying to simulate the effect of blockers in a receiver front end using PSS. I have two desired channels at 1GHz+200K and 1GHz+ 400K and a blocker at 1GHz+ 10MHz. PSS recognized the frequency of the desired channels as 1GHz!

Should I improve some accuracy to get the right frequencies in my PSS?

I am using cadence 5.033

Thank you.

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vborich

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Re: Desired signal @ small offset from LO in PSS
Reply #1 - Nov 6^th, 2005, 4:14pm

I am no expert on PSS but it's clear that you didn't set it up correctly. PSS is a strictly periodic, or one-tone, analysis, and the period is 1/200KHz in your case, which makes it impractical for PSS aplications. It appears that you set it up with 1GHz as the fundamental.

You should use QPSS or, if you have access to it, a harmonic balance simulator.

You could alternatively run this with envelope following analysis and 1 GHz as the clock freq. I don't know the names of Spectre envelope following parameters, but you want to make sure that the maximum envelope time step is no larger than 1/20 MHz and that you run it for at least 1/200 KHz.

Vuk

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