Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By phase
Reexamination Certificate
2005-07-28
2009-12-29
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By phase
C327S007000
Reexamination Certificate
active
07639048
ABSTRACT:
A system and method for detecting a phase and a frequency and an arrival-time difference between two signals (118and120) that minimizes delay and jitter, and has stable operation even when the two signals (118and120) are essentially identical. The system includes two single-ended charge-pump (188), phase-frequency detection (PFD) circuits (280). The first PFD is stable when a reference signal, supplied to a polarity determining flip-flop, leads the signal to be synchronized. A second, complementary, PFD circuit is stable, but has an inverted polarity output, when the signal to be synchronized, supplied to a polarity determining flip-flop, leads the reference signal. A polarity-selection logic-circuit (284) ensures that the first activated PFD controls the polarity a single-ended charge pump (188) for a time-period determined by the delay between the activation of the polarity determining and non-polarity determining flip-flops of the selected PFD.
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Donovan Lincoln
Fox Rothschild LLP
Keystone Semiconductor Inc.
Nguyen Hiep
Woodbridge Richard C.
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