公开(公告)号：US20180191363A1

公开(公告)日：2018-07-05

申请号：US15857651

申请日：2017-12-29

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Ding LI ,  Shuai DU ,  Hongpei WANG

IPC: H03M1/06 ,  H03M1/40

CPC classification number: H03M1/068 ,  H03M1/00 ,  H03M1/1009 ,  H03M1/406 ,  H03M1/66 ,  H03M1/742 ,  H03M1/745 ,  H03M1/785

Abstract: Embodiments of the present invention provide a digital-to-analog conversion circuit, where the digital-to-analog conversion circuit includes a signal amplitude detector and a digital-to-analog converter. When the signal amplitude detector detects a low signal amplitude, a first current module in the digital-to-analog converter operates normally and a second current module in the digital-to-analog converter stops operating. In addition, when stopping operating, the second current module is in a state of a third bias voltage and a fourth bias voltage that are generated by a second bias circuit. When the amplitude detector detects a high signal amplitude subsequently, the second current module resumes normal operation. After operating normally, the second current module switches back to a first bias voltage and a second bias voltage that are generated by a first bias circuit. This reduces a nonlinearity problem caused before a second current module resumes normal operation.