Duty cycle correction device

Details Duty cycle correction device Duty cycle correction device

2007-10-16

2007-10-16

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S172000, C327S173000, C327S174000, C327S176000

Reexamination Certificate

active

11477080

ABSTRACT:
Enclosed is a duty cycle correction device for correcting a duty cycle of a clock signal output from a delay locked loop circuit. The duty cycle correction device includes a mixer for mixing phases of the first and second clock signals, thereby outputting a first signal, a phase splitter receiving the first signal and outputting a third clock signal, a duty detection unit receiving the third and fourth clock signals to detect a difference between duty cycles of the third and fourth clock signals, a combination unit for outputting a second signal, a shift register for outputting a first control signal, a phase detection unit receiving the first and second clock signals and outputting a second control signal representing a difference between duty cycles of the first and second clock signals. The mixer adjusts a mixing ratio by using the first and second control signals.

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patent: 5945862 (1999-08-01), Donnelly et al.
patent: 6573771 (2003-06-01), Lee et al.
patent: 6853225 (2005-02-01), Lee
patent: 7057431 (2006-06-01), Kwak
patent: 7088159 (2006-08-01), Kwak et al.
patent: 7199634 (2007-04-01), Cho et al.
patent: 2007/0030753 (2007-02-01), Kwak
patent: 10-2005-0055925 (2005-06-01), None

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