Tellabs Operations, Inc.

Steven Metzler

Thomas E Ryan

Charles H Daugherty

An improved phase-lock loop circuit comprising a phase detector, a loop filter, and a voltage controlled oscillator. The phase detector samples the phase-lock loop input signal at various points in a cycle of the phase-lock loop output signal and outputs a signal representative of the point of the phase-lock loop output cycle at which a logic state transition of the input signal is detected. In addition, a self-sweeping autolock circuit interacts with the loop filter in such a manner that the self-sweeping autolock circuit commands the loop filter to sweep its output signal when phase-lock is absent and the loop filter halts the sweep of its output signal when phase-lock is acquired.

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Lisle, IL, United States of America

Steven Metzler