"The concept is similar to a darlington, which
    uses like transistors to emulate one high gain
    transistor."

The 'cascode' configuration has other goals like
improved bandwidth and lower noise figure as contrasted
to simply increasing the gain, verily, voltage (and even
current) gain in a cascode configuration is _lower_
than other configurations ...

Jim





----- Original Message -----
From: "Olin Lathrop" <olin_piclist@EMBEDINC.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, May 28, 2002 11:59 AM
Subject: Re: [EE]: Cascoded?


> > I'm reading through some apps notes and what not about amplifiers and
> ADC's etc.
> > Since my EE background is a little weak I'm encountering a lot of
> unfamiliar
> > terms, but one in particular is bugging me. I keep reading about things
> that are
> > cascoded together (transistors, stages, etc.). At first I thought it was
a
> typo
> > (or bad English) and was supposed to read "cascaded", but its occurring
> too
> > frequently to be a typo. I tried dictionary.com and its clueless too.
> Spell
> > check doesn't like it either. Does anybody know what "cascoded" is and
how
> it
> > relates to "cascaded"?
>
> I've seen that term used when two complementary transistors (NPN to PNP or
> vice versa) are cascaded.  The collector of the first transistor is
> connected to the base of the second.  If you tie the emitter of the first
to
> the collector of the second, you are left with three external connections
> which can act like a single transistor with very high current gain.  The
> concept is similar to a darlington, which uses like transistors to emulate
> one high gain transistor.
>
> > <rant>
> > On a related note, I really wish companies would hire English
> speakers/writers
> > if they're going to publish docs using English. Its hard to separate the
> > technical details from the bad grammar.
> > </rant>
>
> Please not to offend of honorable translator from Japanese for English.
He
> job only to make manual look like good.  Americans not so smart for
reading
> but buy much anything we make.  Sell same for manual good or not.
>
>

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