Phase locked loop and method for operating the same

Details Phase locked loop and method for operating the same Phase locked loop and method for operating the same

2007-12-31

2011-11-22

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S014000, C327S157000

Reexamination Certificate

active

08063708

ABSTRACT:
A phase locked loop can reduce a locking time, thereby efficiently reducing power in a locking operation. The phase locked loop includes a phase detector, a control voltage generator, a voltage controlled oscillator and a start-up driver. The phase detector detects a phase difference between a reference clock and a feedback clock to generate a detection signal corresponding to the detected phase difference. The control voltage generator generates a control voltage having a voltage level corresponding to the detection signal. The voltage controlled oscillator generates an internal clock having a frequency corresponding to a voltage level of the control voltage. The start-up driver drives a control voltage terminal to a predefined start-up level in response to a start-up level multiplex signal corresponding to a frequency of the reference clock prior to activation of the voltage controlled oscillator.

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