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Modeling >> Semiconductor Devices >> Shot Noise Model of BJT in Spectre
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Message started by AnalogAroma on Sep 13^th, 2006, 10:30am

Title: Shot Noise Model of BJT in Spectre
Post by AnalogAroma on Sep 13^th, 2006, 10:30am

Hi All,

I would like to know how in Spectre collector shot noise is correlated to the electron current noise originated in the base -emitter junction. Are they still using the old idea of collector partition noise ?

With Regards,

Analog Aroma

Title: Re: Shot Noise Model of BJT in Spectre
Post by ACWWong on Sep 13^th, 2006, 3:16pm

AnalogAroma wrote on Sep 13^th, 2006, 10:30am:

Hi,
When you say spectre, i guess it depends more actually on the model used. I don't think SGP or standard VBIC have any correlation of base shot noise to collector shot noise. I think i have read somewhere that the phillips model (Mextram) has it (physical charge partitioning model rather than emprical extracted) and so more accurately gives NFmin at very high frequency.....
Of course if you are really keen you could code the correlation yourself in your own model...
Look at the under modelling of the designers-guide.org to see veriloga examples of various bjt,hbt models.
cheers
aw

Title: Re: Shot Noise Model of BJT in Spectre
Post by mg777 on Jan 17^th, 2007, 12:22pm

I would be less worried about approximations made in shot noise as opposed to 1/f noise.

M.G.Rajan
www.eecalc.com