THD with Spectre (Cadence Virtuoso)

[saruman1983]

thd in spectre

Hello everyone,

Is there any way I can plot Total Harmonic Distortion of the output vs. the input voltage or current or power in the cadence virtuoso environment?

What I have managed to do so far is to calculate the harmonic distortion for a given input via a transient analysis and by using the thd special function in the calculator. I was wondering if I can somehow sweep the input and obtain the output's thd (all that in one graph).

Thanks in advance
vag

 

[gunturikishore]

virtuoso thd calculator

You can do it by PSS analysis and some DC sweep function available at the bottom of the PSS analysis form. I did it long time back. Since THD is a perfect periodic analysis in most of the circuits, PSS analysis gives a good final solution of the circuit. It provides the DC sweep as required by you. You can read Spectre RF documentation for further details.