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help: about hspice simulation noise.

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eddsos

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help of spice simulation

Hello,
When I simulate amplifier circuit using hspice according IEEE papers, I got lower noise level(100x). Could some one tell me why? I need add background noise? What is the rule to add background noise?
Thanks.
 

FvM

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simulation noise in hspice

What do you mean with background noise? Cosmic microwave background radiation?:D

I rather assume some basic misunderstanding in your noise analysis setup. All SPICE variants are generally considering resistor and semiconductor noise, differences to real behaviour are possible due to inaccurate model parameters, but a factor of 100 is impossible, I think.
 

eddsos

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Thank you very much!
I found why. I misreading the parameter "input referred noise" Vrms and "input referred noise spectra".
 

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