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How to do a linearity analysis of an analog circuit in circuit simulator?

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samiran_dam

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Hi all,

I want to know how can I do a linearity analysis of a analog circuit in circuit simulator such as Cadence?

regards
Sam
 

Linearity Analysis

periodic signal analysis is usually recommended, but yet u can use transient analysis and make fft provided that you take enough cycles in the simulation (50 cycle is ok)
 

Re: Linearity Analysis

Could you please elaborate on the process step by step. It would greatly hlp.
 

Re: Linearity Analysis

Hi samiran_dam,

(1) If you like to visualize linearity/non-linearity you could do a dc analysis in order to evaluate the transfer characteristic (input-output relationship);
(2) If you like to quantify the degree of non-linearity (which is expressed as total harmonic distortion THD in %) you must do a TRAN analysis using a clear sinusoidal input. As mentioned before, you should allow at least 50...100 periods. Because of non-linear effects, the output signal is not sinusoidal anymore (however, perhaps you cannot detect it by visual inspection). In addition to the main frequency component fo there will be new frequencies at m*fo (m=2....n) which determine the THD.
This non-linearity measure THD can be computed by the simulation program (look for FFT or "spectral analysis" or something like this - it depends on the simulator engine).
 

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