Phase locked loop circuit having regulator

Details Phase locked loop circuit having regulator Phase locked loop circuit having regulator

2008-03-04

2009-11-10

Chang, Joseph (Department: 2817)

Oscillators

With particular source of power or bias voltage

Regulated

C331S044000

Reexamination Certificate

active

07616075

ABSTRACT:
Embodiments of present invention provide a circuit including a voltage regulator, a phase frequency detector, a charge pump, a low pass filter a control-voltage generating circuit and a voltage controlled oscillator. In a first mode of operation the voltage controlled oscillator produces an output clock in accordance with a control voltage produced from the control-voltage generating circuit and the output voltage of the voltage regulator. In a second mode of operation, the voltage controlled oscillator produces an output clock in accordance with a control voltage from the low pass filter and the output voltage of the voltage regulator.

REFERENCES:
patent: 2002/0075080 (2002-06-01), Nelson et al.
patent: 2002/0167367 (2002-11-01), Ingino, Jr.
patent: 2001-339298 (2000-05-01), None
patent: 2004-112157 (2002-09-01), None
patent: 2006-25131 (2004-07-01), None

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