Three-state phase-detector/charge pump with no dead-band offerin

Details Three-state phase-detector/charge pump with no dead-band offerin Three-state phase-detector/charge pump with no dead-band offerin

1997-09-30

1999-06-29

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327156, 327147, 327149, 327 3, 327 12, 331 1A, 331 11, 375376, H03L 700

Patent

active

059173521

ABSTRACT:
The present invention is directed to providing a phase detector capable of establishing phase-locked-loop operation in a highly accurate and reliable manner. For example, exemplary embodiments detect a phase difference between at least two input signals to phase lock the input signals to one another. Exemplary embodiments include two phase detectors each of which receives the two input signals (e.g., three-state phase detectors), and each of which is forced to operate outside of its dead-band region by introducing predetermined phase delays for its inputs. Each of the two phase detectors detects a phase difference between its respective inputs. The two phase differences are then combined to produce a composite output signal formed as a net charge proportional to the net phase difference detected by the two phase detectors.

REFERENCES:
patent: 4322643 (1982-03-01), Preslar
patent: 4380083 (1983-04-01), Andersson et al.
patent: 4795985 (1989-01-01), Gillingham et al.
patent: 4803705 (1989-02-01), Gillingham et al.
patent: 4901026 (1990-02-01), Phillips et al.
patent: 4970469 (1990-11-01), Kasperkovitz
patent: 5036216 (1991-07-01), Hohmann et al.
patent: 5408200 (1995-04-01), Buhler

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