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US 6,157,242 AGranted
Charge pump for operation at a wide range of power supply voltages
AssigneeSharp Kabushiki Kaisha
InventorHaruyasu Fukui
Life of this patent
Estimating the term…
Abstract
In a charge pump for providing a desired boosted output voltage, a plurality of boosting stages are connected in series. The pump also has a clock signal supply circuit for providing clock signals and a boost circuit for boosting the clock signals. Clock signals derived from the clock signal supply circuit are supplied to each of the boosting stages on a former side. In contrast, a boosted clock signal derived from the clock signal boost circuit and a clock signal derived from the clock signal supply circuit are supplied to each of the boosting stages on a latter side.
Claims20
A charge pump, comprising:
- n (n:
- an integer, n.gtoreq.2) series-connected boosting stages for receiving an input voltage and providing a boosted output voltage, each boosting stage having first and second switching transistors and first and second boosting capacitors associated with the first and second switching transistors, respectively, each boosting capacitor connected with a gate of the associated switching transistor;
- a clock signal supply circuit for providing a first clock signal and a second clock signal which have specified phases different from each other;
- and
- a clock signal boost circuit for boosting voltages of the first and second clock signals,
- wherein in m (m:
- an integer, n>m.gtoreq.1) latter boosting stages, inclusive of a final boosting stage, of all the n boosting stages, the first and second boosting capacitors are supplied with the boosted first and second clock signals output from the clock signal boost circuit, respectively, while in (n-m) former boosting stages, the first and second boosting capacitors are directly supplied with the first and second clock signals output from the clock signal supply circuit, respectively.
4 more elements
A charge pump, comprising:
- n (an integer, n.gtoreq.2) series-connected boosting stages for receiving an input voltage and providing a boosted output voltage of a magnitude, each boosting stage having first and second switching transistors and first and second boosting capacitors associated with the first and second switching transistors, respectively, each boosting capacitor connected with a gate of the associated switching transistor;
- a clock signal supply circuit for providing a first clock signal and a second clock signal which have specified phases different from each other;
- and
- a clock signal boost circuit for boosting a voltage of one of the first and second clock signals,
- wherein in m (m:
- an integer, n>m.gtoreq.1) latter boosting stages, inclusive of a final boosting stage, of all the n boosting stages, if the first clock signal is boosted, the first and second boosting capacitors are supplied with the boosted first clock signal output from the clock signal boost circuit and the second clock signal output from the clock signal supply circuit, respectively, and if the second clock signal is boosted, the first and second boosting capacitors are supplied with the first clock signal output from the clock signal supply circuit and the boosted second clock signal output from the clock signal boost circuit, respectively, while in (n-m) former boosting stages, in both cases, the first and second boosting capacitors are directly supplied with the first and second clock signals output from the clock signal supply circuit, respectively.
3 more elements
A charge pump, comprising:
- a plurality of series-connected boosting stages for receiving an input voltage and providing a boosted output voltage;
- a clock signal supply circuit for providing a first clock signal and a second clock signal that have same waveforms, but different phases from each other, wherein the first clock signal is intended for odd-numbered boosting stages and the second clock signal is intended for even-numbered boosting stages;
- and
- a clock signal boost circuit for boosting voltages of the first and second clock signals,
- wherein each of one or more latter boosting stages, inclusive of a final boosting stage, of all the boosting stages, is supplied with the boosted first or second clock signal, while each of the other, former boosting stages is supplied with the first or second clock signal not boosted.
2 more elements
Dependencies are inferred from the claim text.