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Reply-To: "fred bartoli"
From: "fred bartoli"
References: <3DF6537E.B0FC9DBE@worldonline.fr> <3DF90203.C9691374@worldonline.fr> <3DF98E5B.D86102A5@worldonline.fr>
Subject: Re: Determining bjt noise parameters for Spice models?
Date: Fri, 13 Dec 2002 11:00:35 +0100
X-Newsreader: Microsoft Outlook Express 5.00.2314.1300
Organization: Guest of ProXad - France
NNTP-Posting-Date: 13 Dec 2002 11:01:07 MET
A.Iakovlev a écrit dans le message :
> Kevin Aylward wrote:
> > A.Iakovlev wrote:
> > > Kevin, Thank you.
> > >
> > > - common emitter;
> > > - collector connected to a voltage source in series with a resistance;
> > > - base directly connected to a voltage source (VSRC, small AC);
> > > - the base voltage source adjusted to get about 10mA collector
> > > current;
> > > - equivalent input noise calculated as V(ONOISE) on the collector
> > > divided by the gain calculated (by Spice)
> > > on the input AC.
> > >
> > > Doing that with the standard 2SC3329 model and varying RB from 2 to
> > > 10 Ohm could not reach the 0.6nV/rtHz specified by the datasheet -
> > > much lower levels obtained; the datasheet announces rb about 2Ohm.
> > >
> > I dont understand whatvyou say here. Is the spice value too high or too
> > low?
> Sorry. The value calculated (not directly by Spice but by me, from the
> V(ONOISE) provided by Spice) was much lower than 0.6 nV/rtHz.
Just in case : beware that usually Spices won't give you the result in terms
of V/rtHz but in terms of V^2/Hz. You have to square root the result you
> Thank you.
> > Kevin Aylward
> > firstname.lastname@example.org
> > http://www.anasoft.co.uk
> > SuperSpice, a very affordable Mixed-Mode
> > Windows Simulator with Schematic Capture,
> > Waveform Display, FFT's and Filter Design.
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