Digital duty cycle corrector for multi-phase clock application

Details Digital duty cycle corrector for multi-phase clock application Digital duty cycle corrector for multi-phase clock application

2007-11-06

2007-11-06

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S172000

Reexamination Certificate

active

11148642

ABSTRACT:
Provided is a digital duty cycle corrector for a multi-phase clock application which includes a flip-flop receiving a signal having a first clock cycle as an input and generating a reference signal having a cycle twice the first clock cycle, a duty corrector generating a signal having a second clock cycle that is half the cycle of the reference signal, from the reference signal, a duty detector measuring an amount of a duty error of the second clock cycle signal and generating a digital code value to control a duty cycle of the second clock cycle signal becomes 50%, and a phase inverter inverting a phase of the second clock cycle signal by 180° such that a rising edge of the second clock cycle signal is always fixed constantly regardless of a duty cycle correction operation.

REFERENCES:
patent: 6426660 (2002-07-01), Ho et al.
patent: 6535040 (2003-03-01), Jung et al.
patent: 6603337 (2003-08-01), Cho
patent: 6639441 (2003-10-01), Ono et al.
patent: 6958639 (2005-10-01), Park et al.
patent: 6967514 (2005-11-01), Kizer et al.
patent: 7015739 (2006-03-01), Lee et al.
patent: 02002235 (1990-01-01), None

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