Phase locked loop charge pump and method of operation

Details Phase locked loop charge pump and method of operation Phase locked loop charge pump and method of operation

2006-09-05

2006-09-05

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S148000

Reexamination Certificate

active

07102400

ABSTRACT:
A charge pump includes a current source capable of generating a reference current. The charge pump also includes a first current mirror capable of conducting a first current. The charge pump further includes a second current mirror capable of conducting a second current and the reference current. In addition, the charge pump includes an output coupled to the first and second current mirrors and capable of providing one of the first and second currents as an output of the charge pump. The first current mirror may be capable of conducting the first current and a second reference current. The second current mirror may be capable of conducting the second current, the reference current, and the second reference current.

REFERENCES:
patent: 6512404 (2003-01-01), Ruegg et al.
patent: 6759912 (2004-07-01), Yamagishi et al.
patent: 2004/0183598 (2004-09-01), Behzad
patent: 2005/0162200 (2005-07-01), Haerle
Woogeun Rhee, “Design of High-Performance CMOS Charge Pumps In Phase-Locked Loops”, IEEE, 1999, pp. II-545-II-548.
Esdras Juarez-Hernandez et al., “A Novel CMOS Charge-Pump Circuit with Positive Feedback for PLL Applications”, Instituto Tecnologico de Chihuahua, Electro 2001, pp. 283-286.
Jae-Shin Lee et al., “A Charge Pump with Perfect Current Matching Characteristics in Phase-Locked Loops.”
Juha Hakkinen et al., “An Integrated Programmable Low-Noise Charge Pump”, IEEE, 1999, pp. 185-188.

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