United Microelectronics Corp.

Hai Thanh Nguyen

Yuan-Hui Chen

Chung-Cheng Tsai

Wei-Liang Chen

A sampling method and a data recovery circuit using the same are provided. The sampling method includes following steps. First, a first strobe, a second strobe, a third strobe, and a fourth strobe are provided, wherein the second strobe lags the first strobe a first predetermined phase, the third and the fourth strobe respectively lag the first and the second strobe a second predetermined phase, and the second predetermined phase is half of the first predetermined phase. Then, a digital signal is respectively sampled with the first and the second strobe. Thereafter, the positions of data transition points of the digital signal are determined according to the sampling results of the first and the second strobe. Next, the third or the fourth strobe is selected as a preferable sampling strobe according to the determination result. Finally, the digital signal is sampled with the preferable sampling strobe.

Sampling method and data recovery circuit using the same

A low-voltage differential signal driver with a pre-emphasis circuit having a current control circuit and a pre-emphasis circuit is provided. Wherein, the pre-emphasis circuit includes the current sourcing circuit and the current sinking circuit, both of which have similar circuit structure, coupled to the current control circuit, respectively. The current sourcing circuit and the current sinking circuit are controlled by two sets of driving signals, so that the pre-emphasis circuit provides an extra driving current to the current control circuit at an instant when the current control circuit switches the current direction. In addition, each set of driving signals contains two synchronous but phase-inversed driving signals. The time it takes for the current steering circuit to switch terminated resistor current between upward and downward directions is decreased.

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Los Altos, CA, United States of America

Hai Thanh Nguyen