Fig. 18.17 Practical ratio detector circuits, {a) unbalanced and (b) balanced
input for the centre point of L
s
is obtained from a coil L
3
tightly
coupled to L
p
. Circuit a is unbalanced, one side of the load circuit
being earthed, and the output is taken from C
2
. Circuit b is balanced,
the midpoint of the diode load circuit being earthed. The output is
taken from Cj but it could equally well be taken from C
2
. This circuit
also includes resistors R
4
and R
5
to optimise the a.m. rejection. In
both circuits the two load resistors R
x
and R
2
are replaced by a single
equivalent resistor R
3
. Notice, too ...
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