Method and apparatus for providing for automatic gain control of

Details Method and apparatus for providing for automatic gain control of Method and apparatus for providing for automatic gain control of

1989-02-09

1991-08-13

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

375 76, 455234, 455240, 328173, H04L 2708

Patent

active

050401947

ABSTRACT:
An improved circuit for providing automatic gain control (AGC) for incoming phase shift keyed (PSK) and quadrature amplitude modulated (QAM) signals. An absolute value circuit (193) and a comparator (195) provide a first error signal (197). An integrater (200,202) smoothes the first error signal (197) to provide a second error signal (201) to a variable-threshold threshold detector (204). The threshold (209) is initially set at a low value to allow the AGC circuit to quickly respond. A larger value is then used to reduce susceptibility to noise and provide for proper QAM operation. An error circuit (208,211,213) provides a non-linear response so that the gain variations will be small when the input signal (190) is large. This non-linear response further reduces the effects of noise on the AGC circuit.

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