QUADRATURE SIGNAL RECEIVER USING SYNCHRONIZED OSCILLATOR
First Claim
Patent Images
1. An apparatus, comprising:
- a processing device;
a signal generator coupled to the processing device and configured to generate a first signal; and
a single receiver coupled to the processing device and configured to receive a second signal from a capacitive sense array, the single receiver comprising a first processing stream to process an in-phase component of the second signal and a second processing stream to process a quadrature component of the second signal, wherein the single receiver is configured to process the second signal for stylus sensing of a stylus proximate to the capacitive sense array in a first mode of operation and to process the second signal for touch sensing of a passive touch object proximate to the capacitive sense array in a second mode of operation, wherein the second signal is unsynchronized with the first signal in the first and second modes of operation.
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Abstract
A system comprises a processing device, a signal generator to generate a first signal and a single receiver to receive a second signal from a capacitive sense array. The single receiver is configured to process the second signal for stylus sensing of a stylus proximate to the capacitive sense array in a first mode of operation and to process the second signal for touch sensing of a passive touch object proximate to the capacitive sense array in a second mode of operation. The second signal is unsynchronized with the first signal.
41 Citations
20 Claims
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1. An apparatus, comprising:
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a processing device; a signal generator coupled to the processing device and configured to generate a first signal; and a single receiver coupled to the processing device and configured to receive a second signal from a capacitive sense array, the single receiver comprising a first processing stream to process an in-phase component of the second signal and a second processing stream to process a quadrature component of the second signal, wherein the single receiver is configured to process the second signal for stylus sensing of a stylus proximate to the capacitive sense array in a first mode of operation and to process the second signal for touch sensing of a passive touch object proximate to the capacitive sense array in a second mode of operation, wherein the second signal is unsynchronized with the first signal in the first and second modes of operation. - View Dependent Claims (2, 3, 4, 6, 7, 20)
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5. (canceled)
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8. A method comprising:
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generating a transmit signal; receiving, by a single receiver, a receive signal from a capacitive sense array; and processing, by the single receiver, the receive signal for stylus sensing of a stylus proximate to the capacitive sense array in a first mode of operation and processing the receive signal for touch sensing of a passive touch object proximate to the capacitive sense array in a second mode of operation, wherein processing the receive signal processing an in-phase component of the receive signal in a first processing stream and processing a quadrature component of the receive signal in a second processing stream, and wherein the receive signal is unsynchronized with the transmit signal in the first and second modes of operation. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system comprising:
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a capacitive sense array; a stylus; and a sensing device coupled to the capacitive sense array, wherein the sensing device comprises; a signal generator configured to generate a first signal; and a single receiver configured to receive a second signal from the capacitive sense array, the single receiver comprising a first processing stream to process an in-phase component of the second signal and a second processing stream to process a quadrature component of the second signal, wherein the single receiver is configured to process the second signal for stylus sensing of the stylus proximate to the capacitive sense array in a first mode of operation and to process the second signal for touch sensing of a passive touch object proximate to the capacitive sense array in a second mode of operation, wherein the second signal is unsynchronized with the first signal in the first and second modes of operation. - View Dependent Claims (16, 17, 18)
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19. (canceled)
Specification