Multi-loop oscillator

Details Multi-loop oscillator Multi-loop oscillator

2006-03-07

2006-03-07

Chang, Joseph (Department: 2817)

Oscillators

Ring oscillators

C331S185000

Reexamination Certificate

active

07009457

ABSTRACT:
A multi-loop oscillator which can control variation of an oscillating frequency of a ring oscillator according to variation of a supply voltage is disclosed comprising: first to Nth delay loops, wherein oscillation signal having a predetermined period is generated by selecting one of first to Nth delay loops according to potential variation of a supply voltage. Herein, the multi-loop oscillator further comprises a loop selection section for selecting one loop from among the first to the Nth delay loops, according to potential variation of the supply voltage. Further, the multi-loop oscillator further comprises a supply voltage detection circuit section for detecting variation of the supply voltage, and the supply voltage detection circuit section controls an operation of the loop selection section. In the multi-loop oscillator, an oscillation frequency of the ring oscillator can be adjusted. Accordingly, when the ring oscillator is employed, an abnormal operation of a pumping circuit operating in response to an oscillation signal of the ring oscillator can be considerably reduced.

REFERENCES:
patent: 5317219 (1994-05-01), Lupi et al.
patent: 5592126 (1997-01-01), Boudewijns et al.
patent: 6831524 (2004-12-01), Krawczyk et al.

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