Phase locked loop design with diode for loop filter...

Details Phase locked loop design with diode for loop filter... Phase locked loop design with diode for loop filter...

2005-03-01

2005-03-01

Nguyen, Minh (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S147000, C327S538000, C375S376000, C331SDIG002

Reexamination Certificate

active

06861885

ABSTRACT:
A phase locked loop design uses a diode operatively connected to a loop filter capacitor to control a leakage current of the loop filter capacitor. By positioning a diode in series with the loop filter capacitor, a voltage potential across the loop filter capacitor is reduced, thereby reducing the leakage current of the loop filter capacitor. Moreover, the leakage current of the loop filter capacitor is controlled in that it cannot exceed the current through the diode. Control and reduction of the loop filter capacitor leakage current leads to more reliable and stable phase locked loop behavior.

REFERENCES:
patent: 2912651 (1959-11-01), Leeds
patent: 5334952 (1994-08-01), Maddy et al.
patent: 5523724 (1996-06-01), Assar et al.
patent: 5548829 (1996-08-01), Suzuki et al.
patent: 5559474 (1996-09-01), Matsumoto et al.
patent: 5659588 (1997-08-01), Fiedler
patent: 5717353 (1998-02-01), Fujimoto
patent: 6437615 (2002-08-01), Stascausky
John G. Maneatis, “Low-Jitter Process-Independent DLL and PLL Based on Self-Biased Techniques”, IEEE Journal of Solid State Circuits, vol. 31, No. 11, Nov. 1996, pp. 1723-1732.

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