Phase frequency detector having instantaneous phase difference o

Details Phase frequency detector having instantaneous phase difference o Phase frequency detector having instantaneous phase difference o

1999-05-04

2000-12-19

Nuton, My-Trang

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327 7, H03L 706

Patent

active

06163185&

ABSTRACT:
A phase frequency detector comprises means for providing Up/Down signals in order to detect a phase difference between detector input signals, and output control means having Up/Down signal inputs for providing a detector output signal containing a measure which is proportional to said detected phase difference, and having capacitor means for providing the detector output signal whose measure depends instantaneously on said detected phase difference.
This allows a loop filter which is present in a phase locked loop to have reduced averaging properties and to have a broader bandwidth resulting in a cleaner output frequency signal of a voltage controlled oscillator in the phase locked loop.

REFERENCES:
patent: 4801894 (1989-01-01), Garner
patent: 5121010 (1992-06-01), Hoshizaki et al.
patent: 5949264 (1999-09-01), Lo
patent: 6002273 (1999-12-01), Humphreys
patent: 6040742 (2000-03-01), Bailey et al.
By Roland E. Best "Phase-Locked Loops" McGraw -Hill 1993, pp. 93-95.

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