Ring oscillator circuit

Details Ring oscillator circuit Ring oscillator circuit

2007-09-04

2007-09-04

Pascal, Robert (Department: 2817)

Oscillators

Ring oscillators

C331S17700V

Reexamination Certificate

active

11112756

ABSTRACT:
A ring oscillator circuit includes a ring of cascade-coupled delay stages and is controlled by a plurality of multiplexers. A feedback circuit has an input terminal coupled to an output terminal of the ring oscillator circuit. The ring oscillator circuit receives a control word and provides a clock signal on the output terminal. The ring oscillator circuit includes a control architecture including a plurality of control blocks receiving respective bits of the control word and coupled to the delay stages of the ring. Each control block has at least a bistable element capable of receiving, storing and sending a bit of the control word to a multiplexer coupled to a respective delay stage in stable operating conditions of the ring.

REFERENCES:
patent: 4458165 (1984-07-01), Jackson
patent: 4691124 (1987-09-01), Ledzius et al.
patent: 5617454 (1997-04-01), Gotz et al.
patent: 6184754 (2001-02-01), Kaneko
patent: 2004/0051593 (2004-03-01), Carpenter et al.
patent: 2004/0189406 (2004-09-01), Shah et al.

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