Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By frequency
Reexamination Certificate
2005-08-30
2005-08-30
Nguyen, Linh My (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By frequency
C327S156000
Reexamination Certificate
active
06937069
ABSTRACT:
In one embodiment a system and method is arranged for bridging the dead-band when asynchronous signals are compared against each other. There is developed a pair of phase related signals from one of the signals, each phase related signal phase shifted from each other, but having the same frequency as the signal from which it was derived. The other frequency signal is compared against each of the phase-related developed signals to generate an error signal which quadrature rotates when the first and second signals are out of frequency with each other. A control signal is generated when the quadrature rotation is outside a certain limit. The error signal is controllably buffered to insure that the error signal only occurs when the frequencies are offset for a selected period of time.
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Pottbacker, Ansgar, et al. “A Si Bipolar Phase and Frequency Detector IC for Clock Extraction up to 8 Gb/s”, IEEE journal of Solid-State Circuits. vol. 27, No. 12, Dec. 1992, pp. 1747-1751.
Rabaey, J.M., “Digital Integrated Circuits”, Prentice Hall, 1996, pp. 533-538.
Galloway Brian J.
Knotts Thomas A.
Agilent Technologie,s Inc.
Nguyen Linh My
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