Charge pump circuit having an improved charge pumping efficiency
First Claim
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1. A charge pump circuit for generating a predetermined voltage, comprising:
- a first transistor element responsive to a first clock signal applied through first capacitance means for transferring a first reference voltage to a first node, said first node receiving a second clock signal through capacitive coupling of second capacitance means; and
a rectifying element connected between the first node and a second node such that electric charges required for generating said predetermined voltage are unidirectionally transferred, said rectifying element comprising a diode-connected transistor element different in conductivity type from said first transistor element.
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Abstract
A charge pump circuit includes a P channel field effect transistor, a diode-connected N channel field effect transistor between a first node and a second node. The P channel field effect transistor operates in response to a first clock signal applied through a first capacitor to discharge the first node to a ground potential. The first node receives a second clock signal through a second capacitor. Negative electric charges are pumped out to the second node. A negative bias voltage is generated from the second node with an improved efficiency and reliability.
79 Citations
20 Claims
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1. A charge pump circuit for generating a predetermined voltage, comprising:
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a first transistor element responsive to a first clock signal applied through first capacitance means for transferring a first reference voltage to a first node, said first node receiving a second clock signal through capacitive coupling of second capacitance means; and a rectifying element connected between the first node and a second node such that electric charges required for generating said predetermined voltage are unidirectionally transferred, said rectifying element comprising a diode-connected transistor element different in conductivity type from said first transistor element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A charge pump circuit for generating a predetermined voltage comprising:
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a first gate type field effect transistor of a first conductivity type responsive to a first clock signal applied through first capacitance means for transferring a first reference voltage to a first node, said first node receiving a second clock signal through capacitive coupling of second capacitance means; and a rectifying element connected between the first node and a second node such that electric charges required for generating said predetermined voltage are unidirectionally transferred, said rectifying element comprising; a junction diode and, wherein said junction diode is formed in a well region of the first conductivity type surrounded by a semiconductor layer of a second conductivity type and separated from any other region forming an element. - View Dependent Claims (19, 20)
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Specification