Mediatek Corporation

Realtek Semiconductor Inc.

Shu-Lin Chang

Chih-Lung Chen

Chih-Hou Tsai

Tzung-Ling Tsai

Chien-Yuan Cheng

Ting-Yu Ko

A complementary current-steering digital-to-analog converter (DAC) including a p-type DAC as well as an n-type DAC is shown. The p-type DAC has p-type current sources, and the n-type DAC has n-type current sources. The p-type and n-type current sources are coupled to a first input terminal or a second input terminal of a transimpedance amplifier (TIA) according to the digital input of the complementary current-steering DAC. In response to the digital input changing from a first value to a second value that is greater than the first value, one or more n-type current sources connected to the second input terminal of the TIA are switched so that they are connected to the first input terminal of the TIA.

Complementary current-steering digital-to-analog converter

Disclosed is a differential amplifier including an input circuit, a detecting and controlling circuit, and an output circuit. The input circuit outputs input current to two output nodes according to the voltage of a differential input signal and the voltage of a bias node. The detecting and controlling circuit outputs compensative current to the two output nodes according to control bias voltage and the voltage of the bias node, in which the voltage of the bias node and the compensative current relate to the voltage of the differential input signal. The output circuit is coupled to the two output nodes and outputs a differential output signal according to the sum of the input current and the compensative current. Due to the detecting and controlling circuit outputting the compensative current, the differential amplifier prevents itself from entering a deadlock state even though the input current is insufficient or zero.

Differential amplifier

Growing community of inventors

Hsinchu, Taiwan

Shu-Lin Chang