Hi there
is it possible to realize a four quadrant voltage multiplier-for audio
signals- using an op amp or two?if so how and if it's not possible what's
the easist way to do it??
Not possible with an ordinary linear op-amp. The usual
approach uses an array of matched transistors (plus a
couple of op-amps). Try a Web search for 'Gilbert Multiplier'.
There are also Operational Transconductance Amplifiers
(OTAs) like the CA3080 and LM13600 that are often used
to create multipliers, but usually just 2-quadrant..
Depending on exactly what you are shooting for, there are
a number of tricky approaches, including diode ring (bridge)
multipliers, FETs as voltage controlled resistors, pulse width
modulation, log-antilog, etc. Tell us more about your application and
maybe we can pick out the simplest/best approach.
Bob Masta
tech(AT)daqarta(DOT)com
D A Q A R T A
Data AcQuisition And Real-Time Analysis
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www.daqarta.com