Motorola Corporation

Neil Evan Welter

Lansing M Carson

A dual bandwidth loop filter includes a filter loop, resistive means, switching means for coupling and decoupling the resistive means for changing the bandwidth of the loop from a wider acquisition bandwidth to a narrower tracking bandwidth and a sweep generator for enabling the filter to provide sweep acquisition of an incoming signal.

Dual bandwidth loop filter with sweep generator

An automatic gain control (hereinafter referred to as AGC) circuitry is used in conjunction with a Costas loop detector to provide positive gain control during the acquisition and tracking modes of the operation of a receiver. The circuitry includes circuitry for deriving a noise estimate signal from one channel of the Costas loop and circuitry for subtracting the noise estimate signal from the data and noise signal combination in the other channel of the Costas loop for providing the automatic gain control signal to prevent false locking.

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Scottsdale, AZ, United States of America

Neil Evan Welter