SINGLE-CHIP MULTI-STIMULUS SENSOR CONTROLLER
First Claim
1. An apparatus for decoding a plurality of sense signals, the apparatus comprising:
- demodulation circuitry configured for mixing each sense signal with a demodulation signal to obtain a set of composite measurements, each sense signal being formed of a plurality of component signals resulting from driving a sensor with a combination of simultaneous drive signals; and
processing circuitry configured for processing the set of composite measurements to obtain measurement data carried by the component signals, wherein processing the set of composite measurements comprises decoding the set of composite measurements to derive the measurement data carried by the component signals, wherein the decoding is based on a plurality of values used to generate the simultaneous drive signals.
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Abstract
A multi-stimulus controller for a multi-touch sensor is formed on a single integrated circuit (single-chip). The multi-stimulus controller includes a transmit oscillator, a transmit signal section that generates a plurality of drive signals based on a frequency of the transmit oscillator, a plurality of transmit channels that transmit the drive signals simultaneously to drive the multi-touch sensor, a receive channel that receives a sense signal resulting from the driving of the multi-touch sensor, a receive oscillator, and a demodulation section that demodulates the received sense signal based on a frequency of the receive oscillator to obtain sensing results, the demodulation section including a demodulator and a vector operator.
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Citations
20 Claims
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1. An apparatus for decoding a plurality of sense signals, the apparatus comprising:
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demodulation circuitry configured for mixing each sense signal with a demodulation signal to obtain a set of composite measurements, each sense signal being formed of a plurality of component signals resulting from driving a sensor with a combination of simultaneous drive signals; and processing circuitry configured for processing the set of composite measurements to obtain measurement data carried by the component signals, wherein processing the set of composite measurements comprises decoding the set of composite measurements to derive the measurement data carried by the component signals, wherein the decoding is based on a plurality of values used to generate the simultaneous drive signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for demodulating and decoding sense signals, the method comprising:
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mixing each sense signal with a demodulation signal to obtain a set of composite measurements, each sense signal being formed of a plurality of component signals resulting from driving a sensor with a combination of simultaneous drive signals; and processing the set of composite measurements to obtain measurement data carried by the component signals, wherein processing the set of composite measurements comprises decoding the set of composite measurements to derive the measurement data carried by the component signals, wherein the decoding is based on a plurality of values used to generate the simultaneous drive signals. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification