Circuit and method for automatic gain control

Details Circuit and method for automatic gain control Circuit and method for automatic gain control

2007-09-04

2007-09-04

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including temperature compensation means

Reexamination Certificate

active

11092566

ABSTRACT:
A system for generating a supply voltage, temperature and process compensated gain control voltage from a digital data word. In particular, the compensated gain voltage control voltage maintains a linear relationship between a change in gain in response to an input gain control voltage for a gain circuit of a transmitter circuit. A monitor circuit senses at least one of the supply voltage, temperature and process parameters, and generates a first set of digital signals corresponding to the sensed parameter. A digital compensator circuit converts the input gain control voltage into a second set of digital signals, and decodes the combined first and second set of digital signals to provide a data word. The data word is converted into an analog voltage representing the compensated gain voltage control voltage. The digital compensator circuit includes a table of compensation values, each accessible by a distinct combination of the first and second set of digital signals.

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