Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

1997-08-18

1999-06-29

Pascal, Robert

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330279, 4552341, H03G 320, H03G 310, H04B 106

Patent

active

059173726

ABSTRACT:
An automatic gain control circuit comprising a variable gain amplifier for controlling a gain of an input signal in accordance with a gain control signal, and outputting the controlled signal, a demodulator for demodulating an output signal from said variable gain amplifier and outputting a baseband signal, an amplitude detecting circuit for detecting an amplitude of the baseband signal to output an amplitude signal, a target amplitude generating circuit for outputting a target amplitude signal, a subtracter for outputting an amplitude error signal based on a difference between the amplitude signal and the target amplitude signal, a sequence control circuit for outputting trigger signals corresponding to not less than a given one-bit interval, and a gain setting circuit for setting a gain with a precision corresponding to a width of (1/N).sup.M by repeatedly performing, over M steps, an operation of selecting and setting one of N gains in steps of 1/N of a total gain width in accordance with the N trigger signals on the basis of the amplitude error signal.

REFERENCES:
patent: 5369789 (1994-11-01), Kosugi et al.
patent: 5737033 (1998-04-01), Masuda

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