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Simulators >> Circuit Simulators >> supply noise modeling in cadence
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Message started by rf_man on Sep 7^th, 2009, 7:37am

Title: supply noise modeling in cadence
Post by rf_man on Sep 7^th, 2009, 7:37am

I would like to simulate NF of an wideband RF amplifier in Spectre, in the specification it is specified that the supply noise can be max. 50nV/sqrt(Hz). From this and the bandwidth also known, I can calculate the rms noise voltageof the supply noise, but how can I bring this supply noise into the simulation?

Title: Re: supply noise modeling in cadence
Post by Andrew Beckett on Jan 3^rd, 2010, 8:57am

If you use (say) the vsource in analogLib for your supply, then there is a parameter "Display noise parameters" which you can check. Then select Noise/Frequency Points as the Noise Entry Method and specify the number of noise/freq pairs you want. If using the older vdc source, you can just directly enter the number of noise/freq pairs you want.

Then enter the noise values in V^2/Hz for a set of frequencies.

Regards,

Andrew.