ACTIVE INTEGRATOR FOR A CAPACITIVE SENSE ARRAY
First Claim
1. A circuit, comprisingan active integrator configured to measure a capacitance of a touch sense array, wherein the active integrator is configured to receive from the touch sense array a response signal having a positive portion and a negative portion, wherein the response signal is representative of a presence or an absence of a conductive object on the touch sense array, and wherein the active integrator is configured to continuously integrate the response signal.
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Accused Products
Abstract
An active integrator for sensing capacitance of a touch sense array is disclosed. The active integrator is configured to receive from the touch sense array a response signal having a positive portion and a negative portion. The response signal is representative of a presence or an absence of a conductive object on the touch sense array. The active integrator is configured to continuously integrate the response signal.
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Citations
20 Claims
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1. A circuit, comprising
an active integrator configured to measure a capacitance of a touch sense array, wherein the active integrator is configured to receive from the touch sense array a response signal having a positive portion and a negative portion, wherein the response signal is representative of a presence or an absence of a conductive object on the touch sense array, and wherein the active integrator is configured to continuously integrate the response signal.
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14. A method, comprising:
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receiving a response signal at an active integrator from a touch sense array, the response signal having a positive portion and a negative portion; and continuously integrating the response signal using the active integrator to measure a change in capacitance, wherein the change in capacitance is representative of an absence or a presence of the conductive object. - View Dependent Claims (15, 16, 17, 18)
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19. An apparatus, comprising:
a processing device configured to detect a presence of a conductive object on a touch sense array, wherein the processing device comprises a capacitive sensing circuit, comprising an active integrator configured to measure a capacitance of the touch sense array, wherein the active integrator is configured to receive from the touch sense array a response signal having a positive portion and a negative portion, wherein the response signal is representative of a presence or an absence of the conductive object on the touch sense array, and wherein the active integrator is configured to continuously integrate the response signal. - View Dependent Claims (20)
Specification