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How to calculate the 3rd harmonic distortion in Cadence?

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princerock

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Hi,

I'm designing an op amp and want to calculate the HD3. The input signal is 1KHz. I found that there's a "dft" function in the calculator. But how to set the variables in it? ("from", "to" means what?) And how to get the HD3 from the dft result?

btw: how long should I run the transient simulation to calculate the HD3?

Thank you for your help in advance!
 

sunking

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you run .tr
from: start time
to: end time

you at least need 3*T, this is to say, for 1k Hz, you at least need 3ms.

run longer time such as 30ms

from 5ms to 35ms
 

Vamsi Mocherla

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You can also run a fourier analysis. It uses the Fourier Integral to calculate the distortion products.
 

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