Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

1990-12-28

1992-12-01

Shepperd, John W.

Registers

Coded record sensors

Particular sensor structure

250214AG, 330134, G06K 710

Patent

active

051681480

ABSTRACT:
In a laser scanning system, an automatic gain control (AGC) circuit for dynamically adjusting the gain of a receiver that is used to receive light reflected from a bar code. The AGC provides a fast adjustment to receiver gain so that the receiver can provide a decodable signal quickly. To accomplish the fast adjustment, the AGC circuit, in addition to sensing the final output of the receiver, includes an additional feedback path from an amplifier in the receiver that is located before the final amplification stage. The additional feedback has a negligible attack time, and adjusts receiver gain quickly, thereby minimizing the time required to reach steady state.

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