The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
References: <3DF6537E.B0FC9DBE@worldonline.fr> <3DF90203.C9691374@worldonline.fr> <3DF94AE1.firstname.lastname@example.org>
Subject: Re: Determining bjt noise parameters for Spice models?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
X-Inktomi-Trace: public1-pete2-5-cust33.pete.broadband.ntl.com 1039977153 22794 126.96.36.199 (15 Dec 2002 18:32:33 GMT)
Date: Sun, 15 Dec 2002 18:32:27 -0000
NNTP-Posting-Date: Sun, 15 Dec 2002 18:32:35 GMT
> "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.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup