Device and method for detecting phase difference and PLL...

Details Device and method for detecting phase difference and PLL... Device and method for detecting phase difference and PLL...

2006-09-19

2006-09-19

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

C327S002000

Reexamination Certificate

active

07109806

ABSTRACT:
A phase detector includes a first control unit and a second control unit to generate a first control pulse and a second control pulse representative of a phase difference between a reference signal and a first clock signal. The first control unit receives the reference signal and the first clock signal and generates the first control pulse. The first control pulse has a first pulse width that varies depending on the phase difference between the reference signal and the first clock signal. The second control unit receives the reference signal and a second clock signal and generates the second control pulse such that the second control pulse substantially overlaps the first control pulse and has a second pulse width that is a preset value. The second clock signal has a frequency higher than that of the first clock signal.

REFERENCES:
patent: 6667639 (2003-12-01), Oyama
patent: 2002/0070813 (2002-06-01), Schrodinger
patent: 2002/0075982 (2002-06-01), Doblar

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