Duty cycle correction circuit and a method for duty cycle...

Details Duty cycle correction circuit and a method for duty cycle... Duty cycle correction circuit and a method for duty cycle...

2007-02-27

2007-02-27

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S175000

Reexamination Certificate

active

11235646

ABSTRACT:
Provided are a duty cycle correction circuit and method for duty cycle correction in a delay locked loop using an inversion locking scheme. The duty cycle correction circuit comprises: a correction unit exchanging and receiving a first duty correction signal and a second duty correction signal and selecting and receiving one of an input clock signal and an inversion signal of the input clock signal in response to an inversion locking signal, and correcting the duty cycle of the received input clock signal or inversion signal of the input clock signal in response to the first and second duty correction signals; a buffer buffering an output signal of the correction unit and outputting the buffered signal as a corrected clock signal; and a duty detector selecting and receiving one of the corrected clock signal and an inversion signal of the corrected clock signal in response to the inversion locking signal, and generating the first and second duty correction signals using the received corrected clock signal or inversion signal of the corrected clock signal.

REFERENCES:
patent: 6687844 (2004-02-01), Zhang
patent: 7015739 (2006-03-01), Lee et al.
patent: 10-2000-0055361 (2000-09-01), None
patent: 10-2003-0052650 (2003-06-01), None
patent: 10-2003-0090122 (2003-11-01), None
patent: 10-2004-0066281 (2004-07-01), None

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