Method and device for determining a duty cycle offset

Details Method and device for determining a duty cycle offset Method and device for determining a duty cycle offset

2008-03-27

2009-11-03

Chang, Joseph (Department: 2817)

Oscillators

Ring oscillators

C327S161000, C327S263000

Reexamination Certificate

active

07612622

ABSTRACT:
Embodiments of the present invention relate to a method and device operable to determine a duty cycle offset of a periodic signal and correct the periodic signal to a desired duty cycle. Embodiment of the present invention may include a ring oscillator circuit. The ring oscillator includes an odd number of ordered inverting elements. One or more of the inverting elements may be an inverting memory element. Each inverting element's output port (except the last inverting element) may be operably connected to the subsequent inverting element's input port. The last inverting element's output port may be operably connected to the first inverting element's input port, thereby forming a chain or ring. A counter may be incremented by oscillations of an output port of an inverting element during a high portion of a periodic signal and may be decremented by oscillations of the output port of the inverting element during a low portion of the periodic signal. The end result in the counter may be proportional to the duty cycle offset of the periodic signal. The end value may then be used to correct the duty cycle of the periodic signal to a desired duty cycle offset.

REFERENCES:
patent: 6232845 (2001-05-01), Kingsley et al.
patent: 6710637 (2004-03-01), Chan
patent: 6958659 (2005-10-01), Nakajima
patent: 2008/0309417 (2008-12-01), Bonwick et al.

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