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US 2004/0061548 A1Published application
Charge pump with Fibonacci number multiplication
AssigneeSanDisk Corporation
InventorRaul-Adrian Cernea
Life of this patent
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Abstract
A charge pump includes a plurality of capacitors that are alternately charged and serially coupled. When serially coupled, the voltage across a given capacitor will equal the voltage at its negative terminal and the voltage across the preceding capacitor.
Claims17
A charge pump, comprising:
- a first plurality of voltage stages, wherein each voltage stage includes a capacitor, the voltages stages being configured to charge the capacitors and serially couple the capacitors such that the capacitor in a first voltage stage has its positive terminal coupled to a negative terminal of the capacitor in a second voltage stage, and so on, and wherein the capacitors are charged and serially coupled such that, for an integer k greater than 1, the voltage across the capacitor in the kth voltage stage is substantially equal to the voltage at its negative terminal plus the voltage across the capacitor in the (k−1)th voltage stage.
A charge pump, comprising:
- a plurality of capacitors;
- means for charging the plurality of capacitors;
- and
- means for serially coupling the charged capacitors such that the negative terminal of a first capacitor in the plurality couples to a supply voltage VCC, the positive terminal of the first capacitor couples to the negative terminal of a second capacitor in the plurality, and so on;
- wherein the means for charging the plurality of capacitors is configured to charge the capacitors such that, when serially coupled and for an integer k greater than one, the voltage across the kth capacitor equals the voltage at its negative terminal and the voltage across the (k−1)th capacitor.
2 more elements
A method of generating voltages, comprising:
- (a) charging a first plurality of capacitors
- (b) serially coupling the first plurality of charged capacitors such that, within the first plurality, a positive terminal of a charged first capacitor couples to a negative terminal of a charged second capacitor and so on;
- (c) charging a second plurality of capacitors from voltages produced by the first plurality of serially-coupled charged capacitors;
- and
- (d) serially coupling the second plurality of charged capacitors such that, within the second plurality, a positive terminal of a charged first capacitor couples to a negative terminal of a charged second capacitor and so on, wherein the charging of the first plurality of capacitors uses voltages produced by the second plurality of serially coupled capacitors, and wherein, during act (b), for an integer k greater than one, the voltage across the kth capacitor in the first plurality equals the voltage at its negative terminal plus the voltage across the (k−1)th capacitor in the first plurality.
2 more elements
Dependencies are inferred from the claim text.