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Simulators >> RF Simulators >> What is large signal noise?
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Message started by king28 on Jan 21^st, 2015, 9:16am

Title: What is large signal noise?
Post by king28 on Jan 21^st, 2015, 9:16am

In cadence user guide (spectre RF), they mention a term called large signal noise problems. What does it mean? What is large signal noise?

Thanks

Title: Re: What is large signal noise?
Post by Frank Wiedmann on Jan 22^nd, 2015, 12:18am

They mention "large signal noise" in the context of Transient Noise Analysis and mean nonlinear effects of noise. Traditional Noise Analysis linearizes the circuit around the DC operating point (just like AC Analysis) and does not show nonlinear effects of noise.

Pnoise Analysis linearizes the circuit around the periodic operating point and does not show nonlinear effects of the noise either. However, it does show nonlinear effects of the periodic signals in the circuit (like mixing), also with respect to the noise.