Focaltech Systems Co., Ltd.

Fang-Yi Su

An active stylus receiving circuit receives a vector data signal transmitted by an active stylus. The vector data signal carries vector data. The vector data includes in-phase data and quadrature data. The active stylus receiving circuit includes an analog-to-digital converter, an interpolation circuit and a demodulation circuit. The analog-to-digital converter samples and converts the vector data signal into digital signal with a plurality of sampling points. The interpolation circuit performs interpolating operation on the digital signal, so as to increase the number of sampling points representing the digital signal, and generate interpolated digital signal. The demodulation circuit performs demodulating operation on the interpolated digital signal to generate demodulated in-phase data and demodulated quadrature data, thereby obtaining demodulated vector data.

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Hsinchu, Taiwan

Fang-Yi Su