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Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
References: <3DF6537E.B0FC9DBE@worldonline.fr> <3DF90203.C9691374@worldonline.fr> <3DF98E5B.D86102A5@worldonline.fr> <firstname.lastname@example.org>
Subject: Re: Determining bjt noise parameters for Spice models?
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Date: Fri, 13 Dec 2002 10:20:51 -0000
NNTP-Posting-Date: Fri, 13 Dec 2002 10:20:55 GMT
fred bartoli wrote:
> 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
>>>> - base directly connected to a voltage source (VSRC, small AC);
>>>> - the base voltage source adjusted to get about 10mA collector
>>>> - 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 have.
But not in SuperSpice. Its read out is in v/rthz:-)
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
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