Huawei Technologies Co., Limited

Yongping Liu

Jun Chen

Gong Tom Lei

Shubao Guo

An embodiment of the present invention provides a digital-to-analog converter including: a primary modulator; a secondary modulator, connected to the primary modulator; a delay unit, connected to the primary modulator; a subtractor, connected to the delay unit and the secondary modulator separately; a first processing module, configured to perform decoding, dynamic matching, and digital-to-analog conversion in sequence on a B-bit digital signal output by the secondary modulator, so as to obtain a first analog signal; a second processing module, configured to perform decoding, dynamic matching, and digital-to-analog conversion in sequence on an (N&#x2212;B+1) -bit quantization noise signal output by the subtractor, so as to obtain an analog noise signal; and an adder, connected to the first processing module and the second processing module separately, and configured to add the first analog signal and the analog noise signal, so as to obtain and output a second analog signal.

Digital-to-analog converter

A device and a method for eliminating feedback common mode signals are provided, which belong to the electronic technology field. The device includes an operational amplifier circuit with two output ends. The two output ends are a first output end and a second output end. The device also includes a feedback unit. The feedback unit is configured to receive level signals of the first output end and the second output end of the operational amplifier circuit, and superpose feedback common mode signals to input ends of the operational amplifier circuit according to states of the level signals. The method includes: the feedback unit receives level signals of a first output end and a second output end of an operational amplifier circuit, and superposes feedback common mode signals to the input ends of the operational amplifier circuit according to the states of the level signals. Thus, the feedback common mode signals of the operational amplifier circuit are stabilized, the requirements for the operational amplifier circuit are lowered, and the performance of the operational amplifier circuit is improved.

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Guangdong, China

Yongping Liu