Phase-locked loop circuit and delay-locked loop circuit

Details Phase-locked loop circuit and delay-locked loop circuit Phase-locked loop circuit and delay-locked loop circuit

2005-10-11

2005-10-11

Chin, Stephen (Department: 2634)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C331S016000

Reexamination Certificate

active

06954511

ABSTRACT:
A PLL circuit and a DLL circuit able to stabilize a control voltage within a short time after a phase pull-in operation in each cycle of a reference clock. In a phase comparator, the size of a leading phase or a delayed phase of a feedback signal is detected with respect to a reference clock signa, and pulse signals having pulse widths corresponding to the size are output. A current corresponding to the signals is output from a charge pump circuit to a lag-lead filter, and a control voltage obtained by removing noise of the above output is output from a low-pass filter to a voltage-controlled oscillator. Furthermore, through capacitors, pulse signals are superposed on the control voltage, and a sharp waveform is obtained by correcting blunting of the waveform by the low-pass filter. Due to this, the control voltage is stabilized within a short time after a phase pull-in operation in each cycle of the reference clock signal.

REFERENCES:
patent: 4156855 (1979-05-01), Crowley
patent: 5334954 (1994-08-01), Koblitz et al.
patent: 5831483 (1998-11-01), Fukuda
patent: 5896066 (1999-04-01), Katayama et al.
patent: 312141 (1989-04-01), None
patent: 373750 (1990-06-01), None
patent: 833452 (1998-04-01), None
patent: 10-242851 (1998-09-01), None
patent: 11-027106 (1999-01-01), None
patent: 11-195982 (1999-07-01), None

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