The present disclosure relates to the field of touch technologies, and in particular, to a capacitance detection circuit, a capacitance detection method, a touch chip, and an electronic device. The capacitance detection circuit includes: a control module, a charge transfer module, a processing module, a drive module, and a cancellation module. The control module is configured to control the drive module to charge a capacitor to be detected. The cancellation module is configured to perform M times of charge cancellations on the capacitor to be detected. The charge transfer module is configured to convert a charge of the capacitor to be detected, subject to the M times of charge cancellations, to generate an output voltage. The processing module is configured to determine, according to the output voltage, a capacitance variation of the capacitor to be detected.

A capacitive sensor includes a switching capacitor circuit, a comparator, and a charge dissipation circuit. The switching capacitor circuit reciprocally couples a sensing capacitor in series with a modulation capacitor during a first switching phase and discharges the sensing capacitor during a second switching phase. The comparator is coupled to compare a voltage potential on the modulation capacitor to a reference and to generate a modulation signal in response. The charge dissipation circuit is coupled to the modulation capacitor to selectively discharge the modulation capacitor in response to the modulation signal.

The present disclosure provides a touch detection circuit which comes with additional, new functions, an input device and an electronic apparatus.

N first terminals (Ps) are each connected with a corresponding first electrode (Es). A second terminal (Pc) is connected with a second electrode (Ec). N first capacitance detection circuits (210) correspond to the N first terminals (Ps), change voltages of the first terminals (Ps), respectively, and each generate a first detection signal indicating an electrostatic capacitance of the corresponding first electrode (Es) in accordance with movement of a charge produced in the corresponding first terminal (Ps). A cancelling circuit (240) driving the second terminal (Pc) in a manner that a voltage of the second terminal (Pc) follows a voltage of the first terminal (Ps). A second capacitance detection circuit (260) generating a second detection signal indicating an electrostatic capacitance of the second electrode (Ec).

An fluid connector apparatus having an exhalation insert that provides an improved exhalation feature whereby exhaled breathing gas flows out of the fluid connector apparatus in the form of elongated blades of gas. The elongated blades of gas enable improved fluid flow when compared with conventional circular jets of gas and advantageously also entrain atmospheric gases adjacent the gas blades to facilitate diffusion and dissipation of the gas blades. The fluid connector apparatus includes one or more elongated flow channels formed between the exhalation insert and the fluid connector. The exhaust gas flows through the flow channels, and the flow channels cause the discharged gas to be output in the form of the elongated blades of gas. The exhalation feature enables the outputting of exhaled breathing gas in greater volumes, at reduced velocities, and with reduced acoustic signature.

A capacitance sensing circuit includes: a front-end circuit, a first subtracting and summing circuit and a capacitance judging circuit; wherein the front-end circuit is coupled to the detection circuit; the first subtracting and summing circuit is coupled between the front-end circuit and the capacitance judging circuit, and includes: a subtracting unit; a summing unit, coupled to the subtracting unit; a first converter, coupled between the summing unit and the capacitance judging unit; and a second converter, coupled between the first converter and the subtracting unit; and the capacitance judging circuit is configured to judge a capacitance change of the detection capacitor. According to the present application, resistance against noise may be improved.

The present application provides a capacitance sensing circuit, comprising an integrating circuit, comprising an integrating input terminal, coupled to the touch capacitance, wherein the integrating input terminal receives an input voltage; and an integrating output terminal, configured to output an output voltage; a comparator; a positive digital-to-analog (DA) converting unit; a negative DA converting unit; a control circuit, configured to control the positive DA converting unit and the negative DA converting unit; and a logic circuit, configured to output an output code, wherein the output code is related to a capacitance of the touch capacitance.

According to a first aspect of the present disclosure, an electronic device for use in a touch-based user interface is provided, the electronic device comprising a first capacitor, a second capacitor, a third capacitor, and an analog-to-digital converter, wherein: the first capacitor and the second capacitor are switchably coupled to each other; the first capacitor is switchably coupled to an input of the analog-to-digital converter; the second capacitor is coupled to the input of the analog-to-digital converter; the third capacitor is coupled to the first capacitor; the third capacitor is switchably coupled to the second capacitor; the third capacitor is switchably coupled to the input of the analog-to-digital converter. According to a second aspect of the present disclosure, a corresponding method of manufacturing an electronic device for use in a touch-based user interface is conceived.

The present disclosure describes aspects of a capacitance-to-voltage modulation circuit. In some aspects, the circuit is used in touch sensing. In some aspects, a modulation circuit comprises a first pair of switches having one switch connected between a voltage source and a capacitor, and another switch connected between ground and the input of the circuit. The circuit also includes a second pair of switches having one switch connected between the voltage source and the input of the circuit, and another switch connected between ground and the capacitor. A third pair of the circuit's switches comprise one switch connected between the capacitor and an input of an analog-to-digital converter (ADC) and another switch connected between the input of the circuit and the input of the ADC. The third pair of switches may enable charge sharing of signals modulated by the first and second pairs of switches, a result of which can be used to sense touch input based on capacitance at the input of the circuit.

The disclosure provides an integrator, a touch display device, and a driving method therefor which can perform amplification and integration functions together. The integrator includes an amplifier having a non-inverting input terminal to which a reference signal having a pulse waveform is supplied; at least one feedback capacitor; a first path switching unit configured to connect the feedback capacitor between an inverting input terminal and an output terminal of the amplifier during a rising period of the reference signal; and a second path switching unit configured to connect the feedback capacitor between the inverting input terminal and the output terminal of the amplifier during a falling period of the reference signal, wherein, during each of the rising period and the falling period of the reference signal, a voltage difference between the reference signal and a signal applied to the inverting input terminal of the amplifier is amplified and accumulated, and the amplified and accumulated voltage difference is output.

A capacitive sensor includes a switching capacitor circuit, a comparator, and a charge dissipation circuit. The switching capacitor circuit reciprocally couples a sensing capacitor in series with a modulation capacitor during a first switching phase and discharges the sensing capacitor during a second switching phase. The comparator is coupled to compare a voltage potential on the modulation capacitor to a reference and to generate a modulation signal in response. The charge dissipation circuit is coupled to the modulation capacitor to selectively discharge the modulation capacitor in response to the modulation signal.