An electrostatic capacitance detection circuit includes a charge amplifier that has an operational amplifier in which a capacitor is provided on a feedback path, and into which a signal including detection of electric charge of an inter-electrode capacitor of a sensor electrode and electric charge due to an external noise, and a selection switch that can switch a direction of a capacitor that is connected to input and output terminals of the charge amplifier through a feedback path that switches the direction of the capacitor depending on a direction of electric charge flowing in from a detection-side electrode of the sensor electrode, due to a drive signal applied to the sensor electrode.

Electrostatic capacitance detection circuit and input device

Disclosed herein is a method for detecting capacitance including: allowing an oscillator to output a plurality of time division oscillation frequencies according to the capacitance detected by a capacitance detection plate; counting the plurality of time division oscillation frequencies during a predetermined time period; and offsetting increasing and decreasing of the oscillation frequencies due to noise such that a count value becomes uniform over the predetermined time period. Even when external noise is applied, distortion of the oscillation frequency due to the external noise is minimized and the oscillation frequency varies depending on only the capacitance of the capacitance detection plate. Accordingly, it is possible to prevent an error due to the noise at the time of the detection of the capacitance.

Method and apparatus for detecting capacitance using a plurality of time division frequencies

A method and an integrated circuit (IC) for detecting capacitance variation are disclosed In order to resolve the prior art problem that sensitivity of detecting capacitance variation is decreased by a time delay component td of a charging/discharging unit, the present invention employs two time divided frequencies More specifically, the method for detecting capacitance variation comprises the steps of: generating a detection frequency (fa) for capacitance variation and a detection frequency (fb) which lags the detection frequency (fa) by k times, wherein the detection frequencies (fa and fb) are based on a time divisional format; operating the detection frequencies (fa and fb) to produce a difference frequency (fd); operating variation rate of the difference frequency; and comparing the variation rate of the difference frequency with a predetermined detection level, and outputting a signal indicative of capacitance variation if the variation rate of the difference frequency is greater than the detection level Therefore, the present invention can enhance sensitivity of detecting capacitance variation

Method and IC for detecting capacitance variation

PROBLEM TO BE SOLVED: To improve accuracy of a capacity detecting device and a resistance detecting device.SOLUTION: The capacity detecting device and the resistance detecting device include an oscillation part, a first differentiation part, a second differentiation part, an integration part, a sample-and-hold part, and a control part. The first differentiation part generates a first differential signal comprising an oscillation signal differentiated by means of a first capacity sensor or a first resistance sensor. The second differentiation part generates a second differential signal comprising the oscillation signal differentiated by means of a second capacity sensor or a second resistance sensor. The integration part generates an integration signal corresponding to a difference between the first and second differential signals with a predetermined phase. The sample-and-hold part holds a value of the integration signal according to a sample-and-hold control signal. The control part generates the sample-and-hold control signal for holding the value of the integration signal for each of a plurality of cycles of the oscillation signal and generates an integration control signal for resetting the integration signal after the value of the integration signal is held.

Capacity detecting device and resistance detecting device

PROBLEM TO BE SOLVED: To provide a touch detection circuit capable of connecting with the sensor capacitance of a self-capacitance method disposed on a touch panel, increasing the amount of an integration signal per unit time, and reducing the operation period of touch detection and improving touch detection accuracy.SOLUTION: A touch detection circuit is a capacitance detection circuit that has an integration capacitance and is connectable with a sensor capacitance, charges and discharges a connected sensor capacitance, and cumulatively adds input and output electrical charges for charging and discharging the sensor capacitance to an integration capacitance. According to the direction of movement of electrical charges accompanying charging and discharging, the polarity of electrical charges added to the integration capacitance is reversed. Since the absolute value of the moving electrical charges is integrated when the sensor capacitance is not only charged but also discharged, the amount of a signal is doubled.

Capacitance detection circuit, touch detection circuit, and semiconductor integrated circuit having the same

PROBLEM TO BE SOLVED: To precisely detect the variation in capacitance by applying a voltage pulse having a reversed phase to one end of a pair of variable capacitance capacitors, by connecting an inversion input of an operational amplifier to the other end, and by connecting the one end and the other end of the detecting capacitor to the inversion input and output of the amplifier connected through a switch, through respective switches. SOLUTION: Variable capacitance capacitors 101, 102 are connected at their one end to a reverse phase output of pulse oscillators 103, 104, and at their other end to an inversion input of an operational amplifier through a switch 105. A a capacitor 107 is connected at its one end to an inversion input of the operational amplifier 106 through a switch 109, and at the other end to the output of the operational amplifier 106 through a switch 110, and to the inversion input of the operational amplifier 106 through a switch 111. A switch 112 is connected between the inversion input and the output of the operational amplifier 106. Accordingly, a voltage is applied to the inversion input of the operational amplifier 106, and the charge depending upon the voltage is accumulated in the capacitor 107, thereby it is possible to output from the output of the amplifier 106.

Capacitance variation detecting circuit

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Capacitance variation detecting circuit