Duty cycle correction circuit

Details Duty cycle correction circuit Duty cycle correction circuit

2006-08-14

2008-08-19

Richards, N. Drew (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S035000, C327S159000

Reexamination Certificate

active

07414448

ABSTRACT:
A duty cycle correction circuit comprises a tuned circuit, a delay circuit and a phase-locked loop; wherein the tuned circuit receives an input clock, generates a periodic pulse according to the input clock, tunes the periodic pulse depending on a reference voltage, and outputs an output clock; a delay circuit receives the output clock, and generates a complementary signal; a phase lock loop receives the complementary signal, measures the periods of time of the high level state and the low level state of the complementary signal, generates the reference voltage and feeds back to the tuned circuit. By using the technique of the present invention, it is able to track the delay time between the input clock and the output clock, and the drift of the output clock is reduced.

REFERENCES:
patent: 4761568 (1988-08-01), Stronski
patent: 5361003 (1994-11-01), Roberts
patent: 6815994 (2004-11-01), Huber et al.
patent: 7282978 (2007-10-01), Lee
patent: 2007/0080732 (2007-04-01), Cho

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