Shenzhen Goodix Technology Co., Ltd.

Yanan Wen

Yingsi Liang

Huafei Li

Fuchiang Yang

As applied to the field of touch control technology, a capacitance sensing circuit for sensing a detection capacitor of a detecting circuit, includes: a capacitance judging circuit coupled to the detecting circuit for judging the capacitance of the detection capacitor according to the output signal; and an input signal generator coupled to the detecting circuit for generating the input signal according to noise. The input signal generator includes: a phase detection unit for receiving the noise and detecting a first phase of the noise; a phase calculation unit coupled to the phase detection unit for receiving the noise and the first phase and calculating an optimum phase according to the noise and the first phase; and a first waveform generator coupled to the phase calculation unit for generating the input signal according to the optimum phase.

Capacitance sensing circuit

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.

Capacitance sensing circuit and touch panel for sensing capacitance changes

A common mode noise processing apparatus is provided. The common mode noise processing apparatus includes s subtraction processing units (-to-) and one spectrum analysis module (); each of the subtraction processing units (-to-) includes two first input ports (-to--to-) connected to the subtractor, one subtractor (-to-) and one first output port (-to-) connected to the subtractor; the spectrum analysis module () includes s second input ports (-to-) connected to the s first output ports in one-to-one correspondence and at least one spectrum analysis unit () connected to the s second input ports (). The common mode noise processing apparatus may be capable of detecting a common mode noise in a signal for determining a location of a touch point, so as to reduce impact of the common mode noise on the signal.

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Shenzhen, China

Yanan Wen