Re: BJT transistor beta, vs Ebers-Moll, Gummel-Poon, and the other tools God has given us

From: lemonjuice (exskimos_at_anonymous.to)
Date: 12/07/04 

Date: 7 Dec 2004 12:27:17 -0800

On Mon, 06 Dec 2004 22:10:06 -0700, Jim Thompson
<thegreatone@example.com> wrote:

>On 6 Dec 2004 18:44:49 -0800, Winfield Hill
><hill_a@t_rowland-dotties-harvard-dot.s-edu> wrote:
>
>>Jim Thompson wrote...
>>>
>>> Sorry to burst your bubble, but gm (for a BJT) is only
>>> a function of current, and NOT the size of the device.
>>
>> Right, assuming Is is constant across the devices...
>> (Someone always has to play the devil's advocate).
>
>And WHERE is it that IS figures into gm ???
>
> ...Jim Thompson
Win means
gm = q*Ic/kT = q/kT(Is *e^Vbe/Vt)

Is = q^2 Ae^2 ni^2 Dn/ Qb
so it clearly depends on transistor size, doping concentration etc...

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