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Analog Electronics
book

Analog Electronics

by Ian Hickman
October 2013
Intermediate to advanced content levelIntermediate to advanced
342 pages
16h 43m
English
Newnes
Content preview from Analog Electronics
Active signal processing
in the
time domain
163
1
1-^
—1
-Κ
1
k
Figure 7.7 Log and
antilog circuits.
(a)
A
logarithmic amplifier,
k
depends upon /?,, /?2,
and
Trj.
Tr, is a
monolithic dual transistor,
e.g.
2N3860.
(b) Multiplier using logamps. Note that
the
usable range
of Vo is no
greater than
in (a).
Therefore
the
circuit cannot
handle
the
whole combined range
of
I/1V2.
(c) Selectable sign
of
gain circuit: gives
xl or
x(-l).
(d) Improved
log
ratio amplifier (reproduced
by
courtesy
of Electronic Product Design).
terminal
of the
opamp
is the
same
as the
input
voltage,
so the
gain
is
unity
and
non-inverting.
If the same voltage
is
applied
t
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Publisher Resources

ISBN: 9781483162287