Jitter-less phase detector in a clock recovery circuit

Details Jitter-less phase detector in a clock recovery circuit Jitter-less phase detector in a clock recovery circuit

2005-02-15

2005-02-15

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

C331S00100A, C331S025000, C327S012000

Reexamination Certificate

active

06856207

ABSTRACT:
A jitter-less phase detector in a clock recovery circuit is disclosed. A first control signal generating circuit generates a first control signal by inverting and delaying input data signals through half clock. A second control signal generating circuit generates a high level second control signal when the data signal changes. A phase comparator generates an up signal having a high-level from the falling edge of the first control signal to the falling edge of the second control signal, and generates a down signal having a high-level from the falling edge of the second control signal to the falling edge of the first control signal, so as to control a pair of current sources to selectively discharge and charge a capacitor.

REFERENCES:
patent: 5081655 (1992-01-01), Long
patent: 5307028 (1994-04-01), Chen
patent: 5602512 (1997-02-01), Neron

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