Duty cycle correction systems and methods

Details Duty cycle correction systems and methods Duty cycle correction systems and methods

2011-05-10

2011-05-10

Luu, An T (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S155000, C327S158000, C327S161000, C327S172000

Reexamination Certificate

active

07940103

ABSTRACT:
Duty cycle correction systems and methods of adjusting duty cycles are provided. One such duty cycle correction system includes a duty cycle adjustor and a variable delay line coupled to the output of the duty cycle adjustor. First and second phase detectors have first inputs coupled to the output of the duty cycle adjustor through an inverter and second inputs coupled to the output of the variable delay line. The phase detectors cause the delay line to align rising or falling edges of signals at the output of the delay line with rising or falling edges, respectively, of signals at the output of the inverter. The controller simultaneously causes the duty cycle adjustor to adjust the duty cycle of the output clock signal until the rising and falling edges of signals at the output of the delay line are aligned with rising and falling edges, respectively, of signals at the output of the inverter.

REFERENCES:
patent: 7057431 (2006-06-01), Kwak
patent: 7199634 (2007-04-01), Cho et al.
patent: 7579890 (2009-08-01), Sohn
patent: 2008/0036517 (2008-02-01), Huang et al.
patent: 2008/0169853 (2008-07-01), Park et al.

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