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How to simulate/plot THD for a cmos op amp using specter/ADE

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Re: How to simulate/plot THD for a cmos op amp using specter

I usually just take the dft and find the difference between the harmonics, though there is function thd in the calculator but I never used
 

In calculator, you switch to the RF mode, and you will find that there is a THD function ready for use.
 

Re: How to simulate/plot THD for a cmos op amp using specter

use the calculator, it's the best and simple way to find THD.
 

Re: How to simulate/plot THD for a cmos op amp using specter

Hi,

The calculator toll from spectre has a built in THD function which you will find if you selectthe RF option or in the "Special functions" menu. In order to use this function you have to perform a transient simulation for at least 20 periods of the input signal and then select the waveform on which you want to evaluate the distorsions, in input the follwing parameter into the function dialog box: the time coordinates of the 20th period (or the last period) and the fundamental frequency of the input signal.

I hope this clears your problem.
 

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