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From: Kevin Aylward on 24 Dec 2009 11:19
Dave wrote:
> How can one tell if one has the optimum setup for biasing a bipolar
> transistor, while it's still all on paper? There must be a way, I
> just don't know what it is, and am thinking that it's not necessary
> to build the damn thing every time to *see* if it works.
>
> Many thanks,
>
> Dave

Use a Spice simulation program that has automatic worst case analysis.

Kevin Aylward

www.anasoft.co.uk
SuperSpice


From: Jon Kirwan on 24 Dec 2009 14:05
On Thu, 24 Dec 2009 16:19:28 GMT, "Kevin Aylward"
<kaExtractThis(a)kevinaylward.co.uk> wrote:

>Dave wrote:
>> How can one tell if one has the optimum setup for biasing a bipolar
>> transistor, while it's still all on paper? There must be a way, I
>> just don't know what it is, and am thinking that it's not necessary
>> to build the damn thing every time to *see* if it works.
>>
>> Many thanks,
>>
>> Dave
>
>Use a Spice simulation program that has automatic worst case analysis.
>
>Kevin Aylward
>
>www.anasoft.co.uk
>SuperSpice

Hi, Kevin. Been a while.

I think the OP wrote "while it's still all on paper." Which is a
skill worth working on, even if "optimum" is never fully achieved and
even if the OP didn't say what the circumstances were. It means the
OP needs to get a handle on BJTs, which is good.

For some specific, worked examples of designing a degenerative 1-BJT
common emitter voltage amp stage, the better I've seen done by hand
were in the Student Manual for the Art of Electronics, 2nd ed. Not
the textbook, but the student manual, where it walks one through a
cookbook ordering of steps with some whys. Together with the
textbook, it's decent.

I remember your descriptions and your web links (which I appreciated)
regarding these things, too. But one needs a little more background,
I think, to appreciate the approaches better.

Also, the OP provides _no_ information about their own background,
skills, what they feel they understand. The one thing we do know is
that the OP does _not_ feel they understand "BJT biasing," for
whatever purpose they may have in mind.

Two things that helped me quite a bit, book-learning wise and aside
from AofA and its student manual, were:

Ian Getreu's "Modeling the Bipolar Transistor," 1979 printing
of the 1976 book; and,
Andrei Vladimirescu's "The SPICE Book," 1994

Ian's book has been digitized and made available from Lulu, about a
month ago. (Tektronix was the prior publisher and they stopped doing
that in 1979.) One of the things it does is to approach, for those
interested, the BJT models from a physical understanding approach
starting with Ebers & Moll's 1954 paper and moving forward with
explanations and reasons along the way through Gummel-Poon (1970).
These include excellent graphs and charts which illustrate in great
detail many important elements in a way I haven't seen in print
before. That's the first half of the book. The other half is about
how to set up and measure the parameter values, which enhances the
theory a great deal I think.

Clive Maxfield has done a recent review:

http://www.techbites.com/200912221556/myblog/reviews/z000c-book-review-modeling-the-bipolar-transistor.html

But without knowing much about the OP or what problem is being worked,
it's really hard to know what to suggest. And the OP has remained
silent on this. Oh, well.

Hope you are doing fine,
Jon
From: pimpom on 24 Dec 2009 14:40
Jon Kirwan wrote:
> On Thu, 24 Dec 2009 16:19:28 GMT, "Kevin Aylward"
> <kaExtractThis(a)kevinaylward.co.uk> wrote:
>
>> Dave wrote:
>>> How can one tell if one has the optimum setup for biasing a
>>> bipolar
>>> transistor, while it's still all on paper? There must be a
>>> way, I
>>> just don't know what it is, and am thinking that it's not
>>> necessary
>>> to build the damn thing every time to *see* if it works.
>>>
>
> But without knowing much about the OP or what problem is being
> worked,
> it's really hard to know what to suggest. And the OP has
> remained
> silent on this. Oh, well.
>

Perhaps I scared him off with my earlier reply, saying that
certain criteria should first be defined to make the term
"optimum" meaningful, while citing several examples of such
criteria. If that's the case, it was not my intention.


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