Phase-controlled current source for phase-locked loop

Details Phase-controlled current source for phase-locked loop Phase-controlled current source for phase-locked loop

2006-09-20

2008-11-11

Pascal, Robert J. (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S025000, C327S002000, C327S003000, C327S005000, C327S007000, C327S012000, C327S040000

Reexamination Certificate

active

07449962

ABSTRACT:
A phase-controlled current source for phase-locked loop is provided. The phase-locked loop includes a voltage-controlled oscillator to associate a charging path or discharging path in order to generate an output signal and the output signal is further sensed so as to generate a loop signal. The phase-controlled current source includes a status memory receiving the loop signal and the reference signal so as to output an energy-triggering/energy-removing signal; and a controllable current source, under the control by energy-triggering/energy-removing signal so as to decide whether a charging and discharging action should be performed, wherein after the charging action or discharging action is decided, the charging path or the discharging path is generated through the reference signal and the loop signal.

REFERENCES:
patent: 5440274 (1995-08-01), Bayer
patent: 5631582 (1997-05-01), Fujikawa
patent: 6011822 (2000-01-01), Dreyer
patent: 6803753 (2004-10-01), Lu
patent: 6856202 (2005-02-01), Lesso

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