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From: Paul Burridge
Subject: Amplifying stage with *negative* Voltage gain??
X-Newsreader: Forte Agent 1.8/32.548
Date: Wed, 04 Dec 2002 08:43:57 +0000
NNTP-Posting-Date: Wed, 04 Dec 2002 10:12:27 GMT
Organization: ntlworld News Service
I've just put together a single-stage buffer amp for an oscillator
stage. It's in emitter follower configuration. The input signal is 8v
p--p; the output, OTOH, is only 2v p-p! The signal frequency is
3.57mhz and the active device I'm using for the buffer (a BC337) is
supposed to be good for 150mhz. So where are all me volts going? I'd
expect to get 99% of 8v out. The general formula for V gain in C/E
amps is RE/RE+re so typically comes out at just under 1. The 8v signal
is present on the base pin; only 2v sig out on the emitter pin.
"I was going to help him up, but then I thumped him."
Michael Head's plea in mitigation to Weybridge Magistrates, Sept. 1975
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