The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Design >> RF Design >> PSRR simulation using PSS+PAC
https://designers-guide.org/forum/YaBB.pl?num=1161801703

Message started by ezencir on Oct 25^th, 2006, 11:41am

Title: PSRR simulation using PSS+PAC
Post by ezencir on Oct 25^th, 2006, 11:41am

Hello All,
Does anyone know how to simulate AM/PM PSRR using PSS+PAC of SpectreRF?

Regards

Title: Re: PSRR simulation using PSS+PAC
Post by Ken Kundert on Oct 25^th, 2006, 12:07pm

Yes, of course.

What is your question? Does it concern the AM/PM, the PSRR, or the PSS+PAC?

-Ken

Title: Re: PSRR simulation using PSS+PAC
Post by ezencir on Oct 25^th, 2006, 1:45pm

Hello Ken
When you do AC and XF to get PSRR you get the rejection performance for additive noise. If you would like to simulate the rejection to amplitude or phase modulating power supply disturbances you need to use PSS and PAC in conjunction. The question is how you do it? That is what I am asking.

Ertan

ezencir wrote on Oct 25^th, 2006, 11:41am:

Hello All,
Does anyone know how to simulate AM/PM PSRR using PSS+PAC of SpectreRF?

Regards

Title: Re: PSRR simulation using PSS+PAC
Post by Ken Kundert on Oct 25^th, 2006, 4:40pm

You would specify pacmag=1 on your supply source, you would use the "modulated" version of PAC and select SSB/AM/PM. Run simulations. From Direct Plot, select PAC modulated, and plot AM and PM results.

-Ken

Title: Re: PSRR simulation using PSS+PAC
Post by loose-electron on Nov 7^th, 2006, 7:59am

A comment on the circuitry if I may -

When a system is matched ideally, the PSRR results will look pretty good. For something more closely related to silicon, statistical mismatch of all elements (Monte Carlo) will give a more menaingful set of numbers.

Jerry