SIGNAL CONTROL CIRCUIT

摘要

A signal control circuit which includes an amplifying transistor connected to an input circuit to receive an input signal. A constant reference bias voltage is produced across a diode connected to the input circuit and signals are connected from the input circuit to the transistor by a resistor. A controllable impedance is connected at a point between the resistor and the transistor so that by controlling the impedance the current gain of the amplifier is linearly controlled over a wide range.