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US 12,763,741 B2Granted
Analog front-end circuit and touch-sensing circuit
AssigneeKunshan Yunyinggu Electronic Technology Co., Ltd.
InventorsKusuma Adi Ningrat, Hanif Fakhruddin
Life of this patent
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Abstract
An analog front-end circuit includes a reference voltage source, a first capacitor, an amplifier, and a second capacitor. The first capacitor is coupled to the reference voltage source through a switch. The amplifier includes a first input end receiving a touch sensing signal from a touch sensor, a second input end receiving a reference signal from the first capacitor, and an output end outputting an output signal. The second capacitor is disposed between the first input end and the second input end.
Claims20
An analog front-end circuit, comprising:
- a reference voltage source;
- a first capacitor coupled to the reference voltage source through a switch;
- an amplifier, comprising:
- a first input end receiving a touch sensing signal from a touch sensor;
- a second input end receiving a reference signal from the first capacitor;
- and
- an output end outputting an output signal;
- a second capacitor disposed between the first input end and the second input end;
- a third capacitor disposed between the first input end and the touch sensor;
- a fourth capacitor disposed between the first input end and a display panel;
- a fifth capacitor disposed between the first input end and the output end;
- a sixth capacitor comprising a first terminal coupled to the first input end and the fifth capacitor and a second terminal coupled to all of a first resistor, the second capacitor, the third capacitor, and the fourth capacitor;
- and
- the first resistor disposed between the output end and the third capacitor.
11 more elements
An analog front-end circuit, comprising:
- a reference voltage source;
- a first capacitor coupled to the reference voltage source through a switch;
- an amplifier, comprising:
- a first input end receiving a touch sensing signal from a touch sensor;
- a second input end receiving a reference signal from the first capacitor;
- and
- an output end outputting an output signal;
- a second capacitor disposed between the first input end and the second input end;
- a third capacitor disposed between the first input end and the touch sensor;
- a fourth capacitor disposed between the first input end and a display panel;
- a first resistor disposed between the output end and the third capacitor;
- a second resistor disposed between the first input end and the output end, wherein the first resistor and the second resistor are two different resistors;
- and
- a third resistor comprising a first terminal coupled to the first input end and the second resistor and a second terminal coupled to all of the first resistor, the second capacitor, the third capacitor, and the fourth capacitor, wherein the third resistor is located between the first resistor and the second resistor.
11 more elements
A touch sensing circuit, comprising:
- an analog front-end circuit, comprising:
- a reference voltage source;
- a first capacitor coupled to the reference voltage source through a switch;
- an amplifier, comprising:
- a first input end receiving a touch sensing signal from a touch sensor;
- a second input end receiving a reference signal from the first capacitor;
- and
- an output end outputting an output signal;
- a second capacitor disposed between the first input end and the second input end;
- a third capacitor disposed between the first input end and the touch sensor;
- a fourth capacitor disposed between the first input end and a display panel;
- a fifth capacitor disposed between the first input end and the output end;
- a sixth capacitor comprising a first terminal coupled to the first input end and the fifth capacitor and a second terminal coupled to all of a first resistor, the second capacitor, the third capacitor, and the fourth capacitor;
- and
- the first resistor disposed between the output end and the third capacitor;
- and
- an integrator circuit, comprising:
- a first integrator input end coupled to the output end of the amplifier;
- a second integrator input end coupled to the reference voltage source;
- and
- an integrator output end.
18 more elements
Dependencies are inferred from the claim text.