Method and apparatus for sensing an input object relative to a sensing region of an ultrasound sensor device
First Claim
1. A subsystem for sensing an input object relative to a sensing region of an ultrasound sensor device, comprising:
- a first circuit having an input for receiving a first resulting signal, wherein the first resulting signal is in a form of a waveform comprising positive and negative polarities, the first resulting signal comprising effects indicative of the input object relative to the sensing region;
a first switch coupled to an output of the first circuit; and
a first integrating capacitor coupled to the output of the first circuit, to a substantially constant voltage source and to the first switch, wherein the first circuit is operable to output a first rectified signal to the first integrating capacitor.
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Abstract
A subsystem, system and method for sensing an input object relative to a sensing region of an ultrasound sensor device are disclosed herein. In one embodiment, a subsystem for sensing an input object relative to a sensing region of an ultrasound sensor device includes a circuit, a switch coupled to an output of the circuit, and an integrating capacitor coupled to the output of the circuit. The circuit has an input for receiving a resulting signal comprising positive and negative polarities, the resulting signal having effects indicative of the input object relative to the sensing region. The integrating capacitor is also coupled to a substantially constant voltage source and to the switch. The circuit is operable to output a rectified signal to the first integrating capacitor indicative of the input object relative to a sensing region.
45 Citations
20 Claims
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1. A subsystem for sensing an input object relative to a sensing region of an ultrasound sensor device, comprising:
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a first circuit having an input for receiving a first resulting signal, wherein the first resulting signal is in a form of a waveform comprising positive and negative polarities, the first resulting signal comprising effects indicative of the input object relative to the sensing region; a first switch coupled to an output of the first circuit; and a first integrating capacitor coupled to the output of the first circuit, to a substantially constant voltage source and to the first switch, wherein the first circuit is operable to output a first rectified signal to the first integrating capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for sensing an input object relative to a sensing region of an ultrasound sensor device, comprising:
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a substrate; an array of sensor electrodes disposed on the substrate and operable to provide a first resulting signal, wherein the first resulting signal is in a form of a waveform comprising positive and negative polarities in response to presence of the input object in the sensing region; and a detection module having a first input coupled to the array of sensor electrodes and an output, the detection module operable to integrate charge onto a first integrating capacitor of the detection module with a first rectified signal in response to receiving the first resulting signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for sensing an input object relative to a sensing region of an ultrasound sensor device, the method comprising:
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receiving a first resulting signal, wherein the first resulting signal is in a form of a waveform comprising positive and negative polarities, the first resulting signal comprising effects indicative of the input object relative to the sensing region; and charging an integrating capacitor with a first rectified signal in response to receiving the first resulting signal. - View Dependent Claims (17, 18, 19, 20)
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Specification