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nickooeda
Joined: 15 Sep 2004
Posts: 44
Helped: 2
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 27 Oct 2004 12:12 how to calculate the THD+N=THD(%)+noise(nv^2/hz) in hspice?? |
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THD is simulated by percent,while noise is nv^2/hz,how to get the THD+N by percent???  thanks first!
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andy2000a
Joined: 18 Jul 2001
Posts: 756
Helped: 7
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| 28 Oct 2004 3:36 Re: how to calculate the THD+N=THD(%)+noise(nv^2/hz) in hspi |
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I am not sure
maybe you can use .four or .fft
but in A/D convert design need ENOB
and need know SNDR usually use .fft
I don't know why not use .four
as I know .four only analysis small singal
so someone tell me .fft more accuracy than .four
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devrimaksin
Joined: 13 Oct 2004
Posts: 93
Helped: 9
Location: Dallas, Texas, USA
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| 28 Oct 2004 3:42 how to calculate the THD+N=THD(%)+noise(nv^2/hz) in hspice?? |
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THD is simulated in transient and noise in ac
simulation. You cannot simulate noise unless
it isa systematic noise suc as quantization noise
In ADC's you can get THD+ quantization noise
through fft.
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