Gain control circuit

Details Gain control circuit Gain control circuit

1976-08-16

1977-12-27

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330285, 330289, 358 27, H03F 345, H03G 330

Patent

active

040657256

ABSTRACT:
An electronic gain control circuit and method are disclosed for providing gain control. The gain control circuit is adaptable for use with differential amplifiers to control the gain thereof and is suitable to be fabricated in monolithic integrated circuit form. The gain control circuit utilizes voltages generated by currents established through diodes to obtain a differential gain voltage to linearly vary the gain of the amplifier. In a preferred form, the amplifier consists of first and second differentially connected transistor pairs with each pair commonly connected to a respective collector of an input differential stage. A constant current source supplies a constant current through a first diode string and is coupled to a common node between the transistor pairs for providing a fixed voltage thereat. Another common node between the transistor pairs that is coupled to the output transistors, is connected to a variable current drive circuit which is adapted to receive a gain control voltage for varying the current drive to the output transistors to vary the gain of the differential amplifier in a linear manner.

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