Oscillator and charge pump circuit using the same
First Claim
1. A current-limited oscillator, comprising:
- 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;
at least one first transistor that limits a first current between said inverters and a high potential power supply; and
at least one second transistor that limits a second current between said inverters and a low potential power supply, wherein at least one of said plurality of inverters is configured as a first inverter that is connected with said first transistor and is not connected with said second transistor, and at least another of said plurality of inverters is configured as a second inverter that is not connected with said first transistor and is connected with said second transistor.
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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.
99 Citations
13 Claims
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1. A current-limited oscillator, comprising:
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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;
at least one first transistor that limits a first current between said inverters and a high potential power supply; and
at least one second transistor that limits a second current between said inverters and a low potential power supply, wherein at least one of said plurality of inverters is configured as a first inverter that is connected with said first transistor and is not connected with said second transistor, and at least another of said plurality of inverters is configured as a second inverter that is not connected with said first transistor and is connected with said second transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 11)
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8. A charge pump circuit comprising:
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a constant-current generating circuit that outputs a current limiting level indication signal;
an oscillator comprising a delay section that includes a plurality of series-connected inverters to delay an output pulse on the basis of said current limiting level indication signal, at least one first transistor that limits a first current between said inverters and a high potential power supply, and at least one second transistor that limits a second current between said inverters and a low potential power supply, wherein at least one of said plurality of inverters is configured as a first inverter that is connected with said first transistor and is not connected with said second transistor, and at least another of said plurality of inverters is configured as a second inverter that is not connected with said first transistor and is connected with said second transistor; and
a voltage generating circuit that generates an output potential based on an output of said oscillator. - View Dependent Claims (9, 12, 13)
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Specification