Gain control circuit for controlling operation of a variable-gai

Details Gain control circuit for controlling operation of a variable-gai Gain control circuit for controlling operation of a variable-gai

1999-07-12

2000-11-07

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 83, H03K 5153

Patent

active

06144233&

ABSTRACT:
A gain control circuit includes a first path block for a gain control voltage and a second path block for a reference voltage. The first path block includes a voltage-current linear conversion unit for outputting a current which is proportional to a gain control voltage V.sub.ctrl, and which is inversely proportional to a resistivity, and also includes a temperature characteristic compensation unit for mirroring the current output by the voltage-current linear conversion unit and outputting a current I.sub.ctrl which is proportional to the gain control voltage V.sub.ctrl and an absolute temperature, and which is inversely proportional to the resistivity. The second path block has the same construction as the first path block except that it receives a reference voltage V.sub.ref and outputs a current I.sub.ref. The current I.sub.ctrl and the current I.sub.ref are supplied to a variable- gain cell so as to produce a voltage gain A.sub.v not affected by a variation in temperature.

REFERENCES:
patent: 5068595 (1991-11-01), Kearney et al.
patent: 5268872 (1993-12-01), Fujii et al.
patent: 5325070 (1994-06-01), McGinn
Meyer, Robert G., "A DC to 1-GHz Differential Monolithic Variable-Gain Amplifier," IEEE J. Solid-State Circuits, vol. SC-26, No. 11, Nov. 1991, pp. 1673-1680.

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