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gogomi
Joined: 05 Jan 2005
Posts: 12
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 07 Jan 2005 23:08 Doing FFT in cadence analog environment |
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Hi,
Does someone know how to use FFT to transform the transient waveform into frequency domain in
cadence analog simulation environment? and is there any way to calculate the amplitude of one
time domain waveform? I coudn't find a good reference for the analog simulation environment.
Thank you very much for your help!
gogomickey
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xuel
Joined: 16 Nov 2004
Posts: 397
Helped: 11
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| 08 Jan 2005 9:45 Re: Doing FFT in cadence analog environment |
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| use dft function in calculator
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qutang
Joined: 25 Oct 2004
Posts: 315
Helped: 6
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| 08 Jan 2005 11:47 Doing FFT in cadence analog environment |
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| does the wave be in AC?
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totoro
Joined: 27 Jun 2004
Posts: 84
Helped: 10
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| 10 Jan 2005 5:06 Re: Doing FFT in cadence analog environment |
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| transient analysis first
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djalli
Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
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| 10 Jan 2005 5:16 Doing FFT in cadence analog environment |
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Transient analysis first you see waveform then:
There is a push-button in the toolbar with words: FFT, look it up...
and the second method is:
| xuel wrote: |
| use dft function in calculator |
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ccw27
Joined: 13 Oct 2004
Posts: 292
Helped: 8
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| 10 Jan 2005 5:30 Re: Doing FFT in cadence analog environment |
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| just use calculator, click vt and choose the node you want to take fft. Then choose dft in calculator and choose the appropriate time interval and finally plot it
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yyliang
Joined: 26 Aug 2004
Posts: 43
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| 10 Jan 2005 6:26 Re: Doing FFT in cadence analog environment |
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| choose a proper window is very important
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gogomi
Joined: 05 Jan 2005
Posts: 12
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| 11 Jan 2005 5:58 Re: Doing FFT in cadence analog environment |
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Yes, I finally got it. The setup is kind of tricky. I'll have to run a long transient time to get the frequency window. Thank you guys!
gogomickey
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eda4you
Joined: 17 Sep 2002
Posts: 283
Helped: 17
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| 11 Jan 2005 15:08 Re: Doing FFT in cadence analog environment |
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| djalli wrote: |
Transient analysis first you see waveform then:
There is a push-button in the toolbar with words: FFT, look it up...
and the second method is:
| xuel wrote: |
| use dft function in calculator |
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A question about dft:
Does Cadence support different kind of windows?
Thx
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lakeoffire
Joined: 10 Dec 2002
Posts: 54
Helped: 2
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| 12 Jan 2005 7:30 Re: Doing FFT in cadence analog environment |
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| eda4you wrote: |
| djalli wrote: |
Transient analysis first you see waveform then:
There is a push-button in the toolbar with words: FFT, look it up...
and the second method is:
| xuel wrote: |
| use dft function in calculator |
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A question about dft:
Does Cadence support different kind of windows?
Thx |
Yes, there are about a dozen of windows you can choose.
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freeinthewind
Joined: 20 Oct 2004
Posts: 108
Helped: 1
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| 12 Jan 2005 15:25 Doing FFT in cadence analog environment |
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| u can use digital proccessing method
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djalli
Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
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| 14 Jan 2005 4:55 Re: Doing FFT in cadence analog environment |
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| freeinthewind wrote: |
| u can use digital proccessing method |
In cadence? How?
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