Amplifier gain control circuit arrangements

Details Amplifier gain control circuit arrangements Amplifier gain control circuit arrangements

1987-06-11

1989-07-18

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330289, 330290, H03F 300

Patent

active

048497126

ABSTRACT:
A gain control circuit arrangement comprises a transistor amplifier (A) for providing an output signal (OP) in response to a received input signal (IP). The gain of the transistor amplifier (A) is controlled by means of a field effect transistor (TF) connected in the emitter circuit of the amplifier and included in a feedback control loop to which a gain control signal (Ref A) is applied in operation of the gain control arrangement. A collector load of the amplifier comprises a potential divider (R1 and R2) one portion of which is shunted by a control loop which serves to maintain constant the collector current passing through the transistor amplifier.

REFERENCES:
Abdulleav et al., "A Pulse Amplifier with a Controllable Gain", Instruments and Experimental Techniques, vol. 18, No. 2, pt. 2, pp. 485-487, Mar.-Apr., 1975 (published Sep. 1975).

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