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

From: Jim Thompson (thegreatone_at_example.com)
Date: 12/07/04 

Date: Mon, 06 Dec 2004 18:01:33 -0700

On Mon, 06 Dec 2004 16:56:41 -0800, Tim Wescott
<tim@wescottnospamdesign.com> wrote:

>Jim Thompson wrote:
>> On 6 Dec 2004 16:17:49 -0800, radio913@aol.com wrote:
>>
>> [snip]
>>
>>>>This has already been explained. Transconductance is the same for all
>>>>transistor, so why state it?
>>>
>>>Bull***! Gm is the same for all transistors?
>>>
>>>It's not even the same for a single transistor, let
>>>alone many of them!
>>>
>>
>> [snip]
>>
>>>Slick
>>
>>
>> Sorry to burst your bubble, but gm (for a BJT) is only a function of
>> current, and NOT the size of the device.
>>
>> ...Jim Thompson
>
>Oh yea? What about temperature, doping profile and material, not to
>mention built-in emitter degeneration in power (at least RF power) devices?
>
>(sorry, couldn't resist tossing a spare grenade into the "BJT's are
>current/voltage controlled" debate).

Might has well toss confetti... just as useful ;-)

                                        ...Jim Thompson 

-- 
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
|  E-mail Address at Website     Fax:(480)460-2142  |  Brass Rat  |
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