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crazyamd
Joined: 11 Jan 2005
Posts: 41
Helped: 2
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 11 Jan 2005 8:38 How to simulate/plot THD for a cmos op amp using specter/ADE |
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| thanks!
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ccw27
Joined: 13 Oct 2004
Posts: 292
Helped: 8
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| 11 Jan 2005 9:10 Re: How to simulate/plot THD for a cmos op amp using specter |
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| 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
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lakeoffire
Joined: 10 Dec 2002
Posts: 54
Helped: 2
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| 12 Jan 2005 7:34 How to simulate/plot THD for a cmos op amp using specter/ADE |
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| In calculator, you switch to the RF mode, and you will find that there is a THD function ready for use.
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chinito
Joined: 05 Jul 2004
Posts: 133
Helped: 4
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| 13 Jan 2005 3:00 Re: How to simulate/plot THD for a cmos op amp using specter |
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| use the calculator, it's the best and simple way to find THD.
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cristianb
Joined: 09 Sep 2003
Posts: 34
Helped: 2
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| 14 Jan 2005 8:29 Re: How to simulate/plot THD for a cmos op amp using specter |
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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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