Fast-setting digital automatic gain control

Details Fast-setting digital automatic gain control Fast-setting digital automatic gain control

2007-09-04

2007-09-04

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S254000

Reexamination Certificate

active

11312089

ABSTRACT:
A fast-settling digital automatic gain control circuit comprises first and second gain-controllable amplifiers in series. Each amplifier can be digitally switched between minimum and maximum gains by control logic that receives inputs from a multi-level voltage comparator. A peak detector connected to the output of the first gain-controlled amplifier is used to set the overall operating ranges for several threshold detectors. Four reference voltages are generated from the peak detector. The highest reference voltage is used to clock and reset the gain control logic with a hysteresis comparator to the instantaneous input signal from the first gain-controlled amplifier. The three other lower reference voltages are used to provide three-bits of digital input data to the gain control logic. Two digital controls are output, a min/max gain bit for the first gain-controlled amplifier, and a similar min/max gain bit for the second gain-controlled amplifier.

REFERENCES:
patent: 6195133 (2001-02-01), Bae
patent: 6972626 (2005-12-01), Takahashi et al.
patent: 6977550 (2005-12-01), Ishida et al.
patent: 7015759 (2006-03-01), Ishida et al.
patent: 7183845 (2007-02-01), Dauphinee et al.
patent: 2004/0259510 (2004-12-01), Audinot et al.

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