5-8. Synchronous Demodulator
signal polarity. In this operation the collector
current is a function of collector voltage only, and
Transistors 3A2Q7 and 3A2Q8 are utilized in this
is essentially independent from other transistor
phase-sensitive rectifying circuit. The signal from
parameters. The voltage applied to the base of the
the output stage (3A2Q14) is compared with the
transistor acts o n l y a s a phase-sensitive
reference signal from 3A2Q5 and 3A2Q6. The
has a polarity corresponding to the original input
Figure 5-5. Synchronous demodulator, simplified schematic diagram.
The driver, 3A2Q1 and 3A2Q2, is a two-transistor
adjusted to 94 Hz.