Oscillator and charge pump circuit using the same

Details Oscillator and charge pump circuit using the same Oscillator and charge pump circuit using the same

2008-07-08

2008-07-08

Kinkead, Arnold (Department: 2817)

Oscillators

Ring oscillators

C331S016000, C331S185000, C331S074000

Reexamination Certificate

active

07397315

ABSTRACT:
The present invention provides a current-limited oscillator capable of performing stable operation even when it is driven with a low power-supply voltage, and a charge pump circuit using the oscillator. A current-limited oscillator has a delay section that includes a plurality of series-connected inverters to delay an output pulse on the basis of a current limiting level indication signal, and the oscillator further includes at least one first transistor that limits a first current between the inverters and a high potential power supply and at least one second transistor that limits a second current between the inverters and a low potential power supply, wherein at least one of the plurality of inverters is configured as a first inverter that is connected with the first transistor and is not connected with the second transistor, and at least another of the plurality of inverters is configured as a second inverter that is not connected with the first transistor and is connected with the second transistor.

REFERENCES:
patent: 5457429 (1995-10-01), Ogawa et al.
patent: 5703541 (1997-12-01), Nakashima
patent: 5912591 (1999-06-01), Yamada
patent: 6137345 (2000-10-01), Kaneko et al.
patent: 6759875 (2004-07-01), Mano et al.
patent: 07-066693 (1995-03-01), None
patent: 08-330912 (1996-12-01), None
patent: 10-229166 (1998-08-01), None
patent: 2002-353781 (2002-12-01), None

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