Multipoint Touch Surface Controller
First Claim
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1. A charge amplifier comprising:
- an operational amplifier having an inverting input terminal, a non-inverting input terminal, and an output terminal;
a feedback capacitor connected between the output terminal and the inverting input terminal, wherein the feedback capacitor is programmable to take on a range of values; and
a feedback resistor connected between the output terminal and the inverting input terminal, wherein the feedback resistor is programmable to take on a range of values.
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Abstract
A multipoint touch surface controller is disclosed herein. The controller includes an integrated circuit including output circuitry for driving a capacitive multi-touch sensor and input circuitry for reading the sensor. Also disclosed herein are various noise rejection and dynamic range enhancement techniques that permit the controller to be used with various sensors in various conditions without reconfiguring hardware.
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Citations
3 Claims
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1. A charge amplifier comprising:
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an operational amplifier having an inverting input terminal, a non-inverting input terminal, and an output terminal; a feedback capacitor connected between the output terminal and the inverting input terminal, wherein the feedback capacitor is programmable to take on a range of values; and a feedback resistor connected between the output terminal and the inverting input terminal, wherein the feedback resistor is programmable to take on a range of values. - View Dependent Claims (2, 3)
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Specification