Abstract: The application relates to a capacitance sensing circuit, which samples and holds a reference signal to generate an input reference signal, hereby, an input signal is generated to a sensing circuit. Thereby, the sensing circuit generates an output signal according to the input signal and a sensing signal, for the capacitance sensing.

Abstract: This disclosure provides a noise suppression circuit for suppressing a noise in a voltage signal. The noise suppression circuit comprises: a switch unit having a first terminal receiving the voltage signal and a second terminal; a capacitor having a first terminal connected to the first terminal of the switch unit and a second terminal grounded; and an analog front-end unit including an operational amplifier with a signal input terminal and a reference-voltage input terminal electrically connected to the second terminal of the switch unit; wherein the switch unit is controlled by a pulse signal.

Abstract: The application relates to a capacitance sensing circuit, which samples and holds a reference signal to generate an input reference signal, hereby, an input signal is generated to a sensing circuit. Thereby, the sensing circuit generates an output signal according to the input signal and a sensing signal, for the capacitance sensing.

Abstract: The present invention provides a touch circuit, which comprises a detection circuit and an emulation circuit. The detection circuit detects a detection signal; the emulation circuit includes a reference load and receives a signal. The emulation circuit generates an emulation signal according to the reference load and the signal. The touch circuit outputs a touch signal according to the detection signal and the emulation signal.

Abstract: The present invention provides a touch circuit, which comprises a detection circuit and an emulation circuit. The detection circuit detects a detection signal; the emulation circuit includes a reference load and receives a signal. The emulation circuit generates an emulation signal according to the reference load and the signal. The touch circuit outputs a touch signal according to the detection signal and the emulation signal.

Abstract: The present invention provides a touch display driving circuit, which comprises a source driving circuit and a touch detection circuit. The source driving circuit is coupled to a plurality of source lines of a touch display panel. The touch display driving circuit outputs a touch driving signal to one of the plurality of source lines during a touch detection cycle. The touch detection circuit receives a plurality of touch sensing signals via the corresponding common electrode of the source line. The plurality of touch sensing signals are then generated according to the touch driving signal.

Abstract: A calibration method for a capacitive sensing device is disclosed. The capacitive sensing device is capable of operating in a self-sensing mode or a mutual-sensing mode. The calibration method includes detecting a capacitance change of a panel in the self-sensing mode to generate a self-sensing output signal, detecting a capacitance change of the panel in the mutual-sensing mode to generate a mutual-sensing output signal, calculating a self-sensing difference between the self-sensing output signal and a self-sensing static parameter, and calibrating the mutual-sensing output signal according to the mutual-sensing output signal and the self-sensing difference.

Abstract: This disclosure provides a noise suppression circuit for suppressing a noise in a voltage signal. The noise suppression circuit comprises: a switch unit having a first terminal receiving the voltage signal and a second terminal; a capacitor having a first terminal connected to the first terminal of the switch unit and a second terminal grounded; and an analog front-end unit including an operational amplifier with a signal input terminal and a reference-voltage input terminal electrically connected to the second terminal of the switch unit; wherein the switch unit is controlled by a pulse signal.

Abstract: A frequency selecting module for a touch system includes a storage unit, for storing a sum of at least one of a plurality of sensing signals of a plurality sensing channels in the touch system; a spectrum calculating unit, for transforming the sum of the at least one of the plurality of sensing signals stored in the storage unit to generate a spectrum data and storing the spectrum data to the storage unit; and a selecting unit, for generating an adjusting signal according to the spectrum data to select one of a plurality of operation frequencies as a working frequency of the plurality of sensing signals.

Abstract: A touch detection method for a capacitive sensing device is disclosed. The capacitive sensing device is utilized for detecting capacitance variance of a panel, and a variable capacitor includes a first end electrically coupled to the panel. The touch detection method includes simultaneously providing a first clock signal to a second end of the variable capacitor and providing a second clock signal to the panel; determining a touched region of the panel according to a voltage variance of the first end of the variable capacitor; and generating an output signal utilized for indicating the touched region. Notably, the first clock signal and the second clock signal have opposite phases against each other.

Abstract: A calibration method for a capacitive sensing device is disclosed. The capacitive sensing device is capable of operating in a self-sensing mode or a mutual-sensing mode. The calibration method includes detecting a capacitance change of a panel in the self-sensing mode to generate a self-sensing output signal, detecting a capacitance change of the panel in the mutual-sensing mode to generate a mutual-sensing output signal, calculating a self-sensing difference between the self-sensing output signal and a self-sensing static parameter, and calibrating the mutual-sensing output signal according to the mutual-sensing output signal and the self-sensing difference.

Abstract: A frequency selecting module for a touch system includes a storage unit, for storing a sum of at least one of a plurality of sensing signals of a plurality sensing channels in the touch system; a spectrum calculating unit, for transforming the sum of the at least one of the plurality of sensing signals stored in the storage unit to generate a spectrum data and storing the spectrum data to the storage unit; and a selecting unit, for generating an adjusting signal according to the spectrum data to select one of a plurality of operation frequencies as a working frequency of the plurality of sensing signals.

Abstract: The present disclosure provides a capacitor voltage information sensing circuit. The capacitor voltage information sensing circuit includes a mixer and an analog filter. The mixer includes a first input terminal for receiving a reference signal, a second input terminal for receiving a voltage signal, the voltage signal includes capacitor voltage information and a noise when a touch occurs, a first output terminal for outputting a first differential signal according to the voltage signal and the reference signal, and a second output terminal for outputting a second differential signal according to the voltage signal and the reference signal. The analog filter is coupled to the mixer for generating a first low-frequency signal and a second low-frequency signal according to the first differential signal and second differential signal.

Abstract: The present disclosure provides a capacitor voltage information sensing circuit. The capacitor voltage information sensing circuit includes a mixer and an analog filter. The mixer includes a first input terminal for receiving a reference signal, a second input terminal for receiving a voltage signal, the voltage signal includes capacitor voltage information and a noise when a touch occurs, a first output terminal for outputting a first differential signal according to the voltage signal and the reference signal, and a second output terminal for outputting a second differential signal according to the voltage signal and the reference signal. The analog filter is coupled to the mixer for generating a first low-frequency signal and a second low-frequency signal according to the first differential signal and second differential signal.