Realtek Semiconductor Inc.

Peng-Zhan Zhang

Li-Jun Gu

Liu Jian

Ran Ding

An apparatus for impedance matching circuit is disclosed. The impedance matching apparatus has an output driver for outputting an output signal and includes an output data generator, for generating an output data signal; an output stage, for generating the output signal according to the output data signal, and receiving a first control signal to adjust an impendence of the output stage; an impendence unit, electrically coupled to the output stage, for receiving a second control signal to adjust an impedance of the impedance unit; and a calibration circuit electrically coupled to the output stage and the impedance unit, for outputting the first control signal and the second control signal to respectively control the output stage and the impedance unit such that a sum of impedances of the output stage and the impedance unit is adjusted to compensate an environment factor of the chip.

Apparatus of impedance matching for output driver and method thereof

The present invention is to provide a method and circuit for producing spread spectrum and over clock, which includes a primary circuit and a secondary circuit, wherein the primary circuit uses a frequency division technique based on phase swallow to achieve a high frequency resolution clock signal, and the secondary circuit multiplies the frequency of the output clock signal of the primary circuit, so as to expand its frequency range.

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Hsinchu, Taiwan

Peng-Zhan Zhang