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how to calculate the THD+N=THD(%)+noise(nv^2/hz) in hspice??

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nickooeda

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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!
 

andy2000a

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Re: how to calculate the THD+N=THD(%)+noise(nv^2/hz) in hspi

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
 

devrimaksin

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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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