Phase-locked loop

Details Phase-locked loop Phase-locked loop

2007-02-05

2009-12-29

Cho, James H. (Department: 2819)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S017000, C327S157000

Reexamination Certificate

active

07639087

ABSTRACT:
A phase-locked loop including a phase comparator, a charging/discharging unit, a low pass filter, a controlled oscillator, and a feedback unit is provided. The charging/discharging unit outputs a control signal according to the result of the phase comparator. The charging/discharging unit includes a compensation unit for compensating the control signal according to a compensation value. The controlled oscillator is electrically connected to the low pass filter and outputs an output signal. The controlled oscillator includes a copy unit which is electrically connected to the compensation unit to determine the compensation value according to an internal current of the controlled oscillator.

REFERENCES:
patent: 5687201 (1997-11-01), McClellan et al.
patent: 5815042 (1998-09-01), Chow et al.
patent: 6426680 (2002-07-01), Duncan et al.
patent: 6661267 (2003-12-01), Walker et al.
patent: 2005/0156673 (2005-07-01), Pretl et al.
patent: 2005/0156684 (2005-07-01), Chiu

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