Digital automatic gain control for multi-stage amplification cir

Details Digital automatic gain control for multi-stage amplification cir Digital automatic gain control for multi-stage amplification cir

1998-05-18

2000-06-13

Hajec, Donald

Registers

Coded record sensors

Particular sensor structure

23546225, G06K 710

Patent

active

060738480

ABSTRACT:
The present invention relates to a multi-stage digital Automatic Gain Control (AGC)circuit for selectively sampling the outputs of a serially connected amplification stages and for selectively controlling the gain of one or more stages in order to keep the amplitude of the final stage output within a predetermined range. The AGC provides a "quick" adjustment to overall system gain so that the system can produce a regulated signal within a short period of time, thereby improving the regulation response time. The AGC includes a number of serially connected amplification stages, and a gain controller. The output of each amplification stage, in addition to feeding the next amplification stage, is also an input to the gain controller. The gain controller receives the amplification-stage outputs, processes the outputs, determines the required gains of the various amplification stages and adjusts the gains via a number of gain control signals. The gain controller, in turn, includes a sensing logic for sensing and processing the amplification-stage outputs, and a gain adjuster for determining and adjusting the required gains. All the gains can be adjusted in a single cycle and the overall system gain can be quickly stabilized.

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