SAMPLE AND HOLD CAPACITANCE TO DIGITAL CONVERTER
First Claim
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1. A circuit for converting a measured charge into a digital signal, the circuit comprising:
- a sample and hold circuit configured to sample a charge from a capacitive sense matrix and hold a signal representing the charge for a first period of time; and
an analog to digital converter that converts the signal into a digital value during the first period of time.
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Abstract
A circuit for converting charge measured from a touch screen into a digital signal can include a sample and hold circuit. The sample and hold circuit can sample and integrate a charge from a capacitive sense matrix, and hold a voltage signal representing the measured charge. A sigma delta converter can convert the voltage into a digital value.
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Citations
20 Claims
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1. A circuit for converting a measured charge into a digital signal, the circuit comprising:
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a sample and hold circuit configured to sample a charge from a capacitive sense matrix and hold a signal representing the charge for a first period of time; and an analog to digital converter that converts the signal into a digital value during the first period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of measuring and converting a charge into a digital signal, the method comprising:
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sampling the charge from a capacitive sense matrix; integrating the charge to produce a voltage; storing the voltage for a first period of time; and converting the voltage into a digital value during the first period of time. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification