Mstar Semiconductor, Inc.

Ju-Ming Chou

Chih-Tien Chang

Yao-Zhong Zhang

An input/output (IO) circuit with high voltage tolerance is provided. In an integrated circuit, the IO circuit includes a charge pump for generating a bias voltage higher than an internal operating voltage of the charge pump itself, and a switch between an external circuit and an internal circuit of the integrated circuit. When the switch conducts between the external circuit and the internal circuit, the switch provides a clamping voltage according to the bias voltage and a cross voltage of the switch, so that a voltage of the internal circuit is bounded by the clamping voltage to prevent the internal circuit from over-voltage.

Input/output circuit with high voltage tolerance and associated apparatus

A current calibration method and the associated control circuit are provided. The method includes: providing a predetermined voltage to the differential output for obtaining an accurate current passing through the panel resistor during a calibration procedure and, providing a driving current to the differential output according to the accurate current during a normal operation procedure.

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Hsinchu Hsien, Taiwan

Ju-Ming Chou