[sdiy] Moog ladder theory questions
Jim Patchell
patchell at cox.net
Thu Jan 15 06:58:33 CET 2009
Quite the opposite....infinite beta means zero base current...in
general, this works out pretty good...you just have to know when to use
it...and when not to.
-Jim
Cornutt, David K wrote:
>
>> From: Jim Patchell [mailto:patchell at cox.net]
>
>> Assuming that beta in infinite is just a way of making
>> analysis easier in some cases.
>
> Interesting... I've never seen any writeup of how transistors
> work, or how to analyze transistor circuits, that assumes that
> beta is infinite. It seems like it would break most of the math --
> if beta is infinite, then emitter current is infinite for any
> non-zero value of base current, and so forth. Maybe that works
> for analysis of switching circuits? (ECL, anyone?)
>
> Now, of course, op-amp tutorials often start out by stating
> that a theoretical op-amp is capable of infinite gain.
> If I didn't know better, I'd be tempted to say that someone
> confused the two concepts.
>
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