[sdiy] Moog ladder theory questions

[Jim Patchell]

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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