Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By phase
Patent
1998-03-17
2000-04-11
Wells, Kenneth B.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By phase
327 3, 327 7, 327149, G01R 2900
Patent
active
060492333
ABSTRACT:
A phase detector circuit includes a first flip flop, a second flip flop, a first charge pump and a second charge pump. Outputs of the flip flops directly enable the charge pumps in response to received clocking signals. A first delay circuit delays the output signal from the first flip flop to an AND gate which combines the delayed output signal and the output signal from the second flip flop. The AND gate output is delayed in a second delay circuit to produce a delayed reset signal which resets both flip flops simultaneously and disables the charge pumps. The phase detector circuit balances the amount of charge provided to a phase locked loop near the in-phase condition to improve linearization of the phase detector.
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patent: 5892380 (1999-04-01), Quist
Bartusiak Paul J.
Motorola Inc.
Nguyen Hai L.
Rauch John G.
Wells Kenneth B.
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