System and method for controlling a gain circuit

Details System and method for controlling a gain circuit System and method for controlling a gain circuit

1994-01-28

1995-08-15

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327346, H03L 500, G06F 7556

Patent

active

054423112

ABSTRACT:
A circuit (12) for controlling the gain of a gain cell (14) is provided. Circuit (12) comprises a circuit (16) for generating a control current. A circuit (22) generates a reference voltage. A circuit (18) uses the reference voltage to generate a first control voltage. A circuit (20) uses the control current to generate a second control voltage. The first and second control voltages comprise a differential control output of circuit (12). The gain of the gain cell is exponentially related to the control current.

REFERENCES:
patent: 4331929 (1982-05-01), Yokoyama
patent: 5162678 (1992-11-01), Yamasaki
patent: 5220219 (1993-06-01), Barber
patent: 5248945 (1993-09-01), Atkinson

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