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Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
References: <3DF6537E.B0FC9DBE@worldonline.fr> <3DF90203.C9691374@worldonline.fr> <3DF94AE1.email@example.com>
Subject: Re: Determining bjt noise parameters for Spice models?
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Date: Sun, 15 Dec 2002 18:32:27 -0000
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> "Kevin Aylward" wrote in message
>> John S. Dyson wrote:
>>> "Kevin Aylward" wrote in message
>>>> It is the fact that transistors have a large spread in rbb' from
>>>> device to device that actually differentiates low noise devices
>>>> from any othe device. Its inherent that if one tries to chose a
>>>> low noise device, then one is selecting principly for *low* rbb.
>>>> Nothing else matters much.
>>>> A low noise transistor is essentially a transistor with low rbb,
>>>> and low 1/f noise. End of story.
>>> I'd agree with you given the following qualification: you are
>>> speaking of low/middle freqs, and also hfe(Beta) does count for high
>>> source resistance applications, especially in cases where the Ic
>>> might be chosen to be high for bandwidth or other reasons.
>> Ahmmm. Did you read my post? I did address the hfe issue, to wit:
> I did, but you said in an unqualified way that rbb (and the obvious
> low 1/f noise) as being the key... Remember your 'end of story'
But there was an epilogue to the story.
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
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