Controllable amplifier circuit

Details Controllable amplifier circuit Controllable amplifier circuit

1992-04-23

1993-06-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330277, 330311, H03G 330

Patent

active

052163830

ABSTRACT:
A controllable amplifier circuit includes, successively, in a cascode arrangement between a power supply voltage and ground, a control transistor and a field effect amplifier transistor having a control input for applying a gain control signal thereto and a gate input for applying an input signal thereto, respectively, via which control transistor the field effect amplifier transistor supplies an output signal to a signal output of the controllable amplifier circuit. The control transistor varies the working point of the field effect amplifier transistor in the ohmic range in dependence upon the gain control signal, at least in a part of the control range of the gain control signal. The circuit can be used with a low power supply voltage because the controllable amplifier circuit includes a controllable bias circuit which is coupled to the gate input of the field effect amplifier transistor for applying a controllable bias voltage thereto. This voltage varies in the opposite direction to the gain control signal mainly in said part of the control range.

REFERENCES:
patent: 3443240 (1969-05-01), Santilli

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