This thesis is mainly divided into three parts. In the first part, we design a timing controller applied to the liquid crystal display. The timing controller receives 6-bit series data, brings out synchronous signals which can be used for the panel in the XGA standard. The main circuits of the timing controller are the data receiver and the timing generator. In the second part, a high-driving class-AB buffer amplifier, which consists of a high-gain input stage and a pseudo source follower, is proposed. The new-type pseudo source follower improves the driving capability by using two same types of differential pairs rather than two complementary error amplifiers. In the third part, we have proposed a wide-band divided-by-2 circuit. This circuit has a larger working range, and has lower power consumption.