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manissri
Joined: 16 Apr 2005
Posts: 273
Helped: 6
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 15 Mar 2007 8:03 THD of S/H circuit |
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how i calculate the THD of sample and hold circuits in cadence tool
actually the normal procedure as the select the net and take special function of THD and then plot .
but this is ok with the continuous wave and any amp.
but here the input signal is getting sampled at every clock cycle.
so i need to calculate the THD ...in this regards.
and please tell me how to measure the gain error and nonlinearity and pedestal error of s/h circuit in cadence ..
and docs for test benchs available plese please send to me..
i will be really obliged ..
regards
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walker5678
Joined: 17 May 2006
Posts: 123
Helped: 4
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| 15 Mar 2007 13:11 Re: THD of S/H circuit |
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| I think for THD simulation, you can use the "fourier" component from analogLib connect between the output terminal and GND, and edit a model file for the fourier. When you run transient analysis, it will show the THD result.
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liao0009
Joined: 28 Dec 2007
Posts: 7
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| 28 Dec 2007 11:49 Re: THD of S/H circuit |
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| Hi.. I am working on a similar problem need to calculate the THD of the output, anybody can give a little bit more detials about how to edit the model file for this fourier component?
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gpwu
Joined: 07 Dec 2007
Posts: 48
Helped: 4
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| 30 Dec 2007 21:48 Re: THD of S/H circuit |
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| Feed the output to the FFT program.
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mitgrace
Joined: 08 May 2004
Posts: 335
Helped: 4
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| 02 Jan 2008 15:56 THD of S/H circuit |
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| You can use sample function in calculator . The get the data into matlab, then do FFT...
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qqic
Joined: 25 Aug 2006
Posts: 77
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| 03 Jan 2008 0:42 THD of S/H circuit |
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| use FFT
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