Digitally controlled ring oscillator

Details Digitally controlled ring oscillator Digitally controlled ring oscillator

2007-04-09

2009-06-16

Barnie, Rexford (Department: 2819)

Oscillators

Ring oscillators

C331S17700V

Reexamination Certificate

active

07548127

ABSTRACT:
A ring oscillator for generating an output signal, comprising a plurality of serially connected main elements for selectively delaying a signal input thereto, each of the plurality of main elements having two circuit paths, a first path including at least one time-delay element for delaying a signal input thereto and a second circuit path bypassing the first circuit path; and a multiplexor (MUX) having a first input coupled to the first circuit path including the at least one time-delay element and a second input coupled to the second circuit path, the MUX selecting the first or second inputs of a plurality of inputs and outputting an output signal.

REFERENCES:
patent: 7265638 (2007-09-01), Osvaldella
patent: 2002/0171496 (2002-11-01), Jordan et al.
patent: 2004/0070459 (2004-04-01), Motoyama
patent: 2004/0263266 (2004-12-01), Rosenbaum
A Scalable DCO Design for Portable ADPLL Designs, Chia-Tsun Wu et al, pp. 5449-5452, Aug. 2005.
DIGICC™ PLL Technology, Technology Background, C3IP, Nov. 2004.

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