Force sensing
First Claim
1. An apparatus comprising:
- a first signal generator of a force sensing circuit to output a first excitation (TX) signal on a first terminal and a second TX signal on a second terminal, wherein the first terminal and the second terminal are configured to couple to a first force sensor and a reference sensor, wherein the first force sensor is subject to deformation by a touch object, and wherein the reference sensor is not subject to deformation by the touch object; and
a first receiver channel of the force sensing circuit coupled to a third terminal and a fourth terminal, wherein the third terminal is configured to couple to the first force sensor and the fourth terminal is configured to couple to the reference sensor, wherein the force sensing circuit is configured to measure a first receive (RX) signal from the first force sensor via the third terminal and a second RX signal from the reference sensor via the fourth terminal, wherein the force sensing circuit is configured to measure a force value indicative of a force applied by the touch object to the first force sensor by using the second RX signal to remove noise from the first RX signal caused by vibration of the apparatus.
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Accused Products
Abstract
An apparatus including a first signal generator of a force sensing circuit to output a first excitation (TX) signal on a first terminal and a second TX signal on a second terminal. The first terminal and the second terminal are configured to couple to a first force sensor and a reference sensor. The apparatus includes a first receiver channel coupled to a third terminal and a fourth terminal. The third terminal is configured to couple to the first force sensor and the fourth terminal is configured to couple to the reference sensor. The force sensing circuit is configured to measure a first receive (RX) signal from the first force sensor via the third terminal and a second RX signal from the reference sensor via the fourth terminal. The force sensing circuit is configured to measure a force value indicative of a force applied to the first force sensor.
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Citations
21 Claims
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1. An apparatus comprising:
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a first signal generator of a force sensing circuit to output a first excitation (TX) signal on a first terminal and a second TX signal on a second terminal, wherein the first terminal and the second terminal are configured to couple to a first force sensor and a reference sensor, wherein the first force sensor is subject to deformation by a touch object, and wherein the reference sensor is not subject to deformation by the touch object; and a first receiver channel of the force sensing circuit coupled to a third terminal and a fourth terminal, wherein the third terminal is configured to couple to the first force sensor and the fourth terminal is configured to couple to the reference sensor, wherein the force sensing circuit is configured to measure a first receive (RX) signal from the first force sensor via the third terminal and a second RX signal from the reference sensor via the fourth terminal, wherein the force sensing circuit is configured to measure a force value indicative of a force applied by the touch object to the first force sensor by using the second RX signal to remove noise from the first RX signal caused by vibration of the apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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generating a first excitation (TX) signal and a second TX signal; measuring, by a force sensing circuit, a first capacitance of a first force sensor that is subject to deformation by a touch object; measuring, by the force sensing circuit, a second capacitance of a reference sensor that is not subject to deformation by the touch object; and determining a force applied by the touch object to the first force sensor by using the second capacitance to remove noise from the first capacitance caused by vibration. - View Dependent Claims (12, 13, 14)
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15. A system comprising:
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a force touch panel comprising a first force sensor and a reference sensor; and a processing device operatively coupled to the force touch panel, the processing device comprising; a first signal generator of a force sensing circuit to output a first excitation (TX) signal and a second TX signal, wherein the first TX signal is configured to couple to the first force sensor and the reference sensor, wherein the first force sensor is subject to a force applied to the force touch panel by a touch object and the reference sensor is not subject to the force applied to the force touch panel by the touch object; and a first receiver channel of the force sensing circuit coupled to the first force sensor and the reference sensor, wherein the force sensing circuit is configured to measure a first receive (RX) signal from the first force sensor and a second RX signal from the reference sensor, wherein the force sensing circuit is configured to measure a force value indicative of the force applied by the touch object to the first force sensor by using the second RX signal to remove noise from the first RX signal caused by vibration of the system. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification