Integrating Circuit and Capacitance Sensing Circuit
AssigneeShenzhen Goodix Technology Co., Ltd.
InventorsYa-Nan Wen, Fu-Chiang Yang, Yingsi Liang
Life of this patent
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Abstract
The present disclosure is applied to touch technology, and provides an integrating circuit. The integrating circuit comprises an impedance unit, an amplifier, an integration capacitor, a discharge capacitor, a first switch and a second switch. The amplifier comprises a first input terminal, a second input terminal and an output terminal configured to output an output signal; the integration capacitor is coupled between the first input terminal and the output terminal; the first switch is coupled between the first input terminal of the amplifier and the second terminal of the discharge capacitor; and the second switch is coupled between the first terminal and the second terminal of the discharge capacitor.
Claims20
An integrating circuit, comprising:
- an impedance unit;
- an amplifier, comprising:
- a first input terminal, coupled to the impedance unit;
- a second input terminal;
- and
- an output terminal, configured to output an output signal;
- an integration capacitor, coupled between the first input terminal and the output terminal;
- a discharge capacitor, comprising:
- a first terminal, configured to receive a first voltage;
- and
- a second terminal;
- a first switch, coupled between the first input terminal of the amplifier and the second terminal of the discharge capacitor;
- and
- a second switch, coupled between the first terminal and the second terminal of the discharge capacitor.
A capacitance sensing circuit, configured to sense a detection capacitance of a detection circuit, comprising:
- a front-end circuit, coupled to the detection circuit, comprising at least one active component;
- a first analog-to-digital convertor (ADC), configured to generate a first digital signal;
- a capacitance determining circuit, coupled to the first ADC, configured to determine a capacitance variation of the detection capacitance according to the first digital signal;
- and
- a first integrating circuit, coupled between the detection circuit and the first ADC, wherein the first integrating circuit comprises:
- an impedance unit;
- a first amplifier, comprising:
- a first input terminal, coupled to the impedance unit;
- a second input terminal;
- and
- an output terminal, configured to output a first output signal to the first ADC;
- a first integration capacitor, coupled between the first input terminal and the output terminal of the first amplifier;
- a first discharge capacitor, comprising:
- a first terminal, configured to receive a first voltage;
- and
- a second terminal;
- a first switch, coupled between the first input terminal of the first amplifier and the second terminal of the discharge capacitor;
- and
- a second switch, coupled between the first terminal and the second terminal of the discharge capacitor.
Dependencies are inferred from the claim text.