Charge pump having AC and DC outputs for touch panel bootstrapping and substrate biasing
First Claim
1. Charge pump circuitry configured to operate in a first mode and a second mode, the charge pump circuitry comprising:
- a first switch formed in a first well in a substrate, wherein the first switch is coupled to a first output node of the charge pump circuitry; and
a second switch formed in a second well in the substrate, wherein the second switch is coupled to a second output node of the charge pump circuitry, and the first well is disposed within the second well,wherein;
the first output node is configured to output a first voltage to a touch-sensitive device,the second output node is configured to output a second voltage to the touch-sensitive device, different than the first voltage,during the first mode, the first output node is configured to output a first DC voltage, and the second output node is configured to output a second DC voltage, andduring the second mode, the first output node is configured to output a first AC voltage, and the second output node is configured to output a second AC voltage.
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Accused Products
Abstract
A charge pump that can be configured to operate in a first mode and a second mode is disclosed. The charge pump can comprise a charging capacitor coupled to a first node and configured to transfer a first DC voltage to the first node. The charge pump can also comprise a first output node and a second output node coupled to the first node. During the first mode, the first output node can be configured to output a second DC voltage based on the first DC voltage, and the second output node can be configured to output a third DC voltage based on the first DC voltage. During the second mode, the first output node can be configured to output the second DC voltage, and the second output node can be configured to output an AC voltage, the AC voltage being offset by the third DC voltage.
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Citations
17 Claims
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1. Charge pump circuitry configured to operate in a first mode and a second mode, the charge pump circuitry comprising:
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a first switch formed in a first well in a substrate, wherein the first switch is coupled to a first output node of the charge pump circuitry; and a second switch formed in a second well in the substrate, wherein the second switch is coupled to a second output node of the charge pump circuitry, and the first well is disposed within the second well, wherein; the first output node is configured to output a first voltage to a touch-sensitive device, the second output node is configured to output a second voltage to the touch-sensitive device, different than the first voltage, during the first mode, the first output node is configured to output a first DC voltage, and the second output node is configured to output a second DC voltage, and during the second mode, the first output node is configured to output a first AC voltage, and the second output node is configured to output a second AC voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of fabricating charge pump circuitry, comprising:
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forming a first switch in a first well in a substrate, wherein the first switch is coupled to a first output node of the charge pump circuitry; and forming a second switch in a second well in the substrate, wherein the second switch is coupled to a second output node of the charge pump circuitry, and the first well is disposed within the second well, wherein; the first output node is configured to output a first voltage to a touch-sensitive device, the second output node is configured to output a second voltage to the touch-sensitive device, different than the first voltage, during a first mode, the first output node is configured to output a first DC voltage, and the second output node is configured to output a second DC voltage, and during a second mode, the first output node is configured to output a first AC voltage, and the second output node is configured to output a second AC voltage.
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10. A method of operating charge pump circuitry configured to operate in a first mode and a second mode, the method comprising:
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outputting, at a first output node of the charge pump circuitry, a first voltage to a touch-sensitive device, wherein the charge pump circuitry comprises a first switch formed in a first well in a substrate, and the first switch is coupled to the first output node of the charge pump circuitry; outputting, at a second output node of the charge pump circuitry, a second voltage to the touch-sensitive device, different than the first voltage, wherein the charge pump circuitry comprises a second switch formed in a second well in the substrate, the second switch is coupled to the second output node of the charge pump circuitry, and the first well is disposed within the second well; during the first mode; outputting, at the first output node, a first DC voltage; and outputting, at the second output node, a second DC voltage; and during the second mode; outputting, at the first output node, a first AC voltage; and outputting, at the second output node, a second AC voltage. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification