Re: VBC of npn transistor in common collector mode



John B wrote:

"Eeyore" <rabbitsfriendsandrelations@xxxxxxxxxxxxxxxxxxxxxx> wrote in
message news:44AD3067.28D655D3@xxxxxxxxxxxxxxxxxxxxxxxxx

The more common name for this is an emitter follower.
I disagree. Emitter follower has a different topology. There is nothing
"below" the collector, of my flipped transistor, other than an attached
ground.

Emitter follower and common collector are the same thing. You were mistaken to
call it common collector.

If this npn transistor were to be suddenly replaced by a pnp, then I see an
emitter follower. Of course, the controlling signal at the base would then
have to be referenced to the upper rail, instead of to ground, as my npn is.

Since supply and ground are typically the same thing for a.c. coupled signals
that difference is largely academic.

Graham


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Relevant Pages

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