公开(公告)号：US09450599B1

公开(公告)日：2016-09-20

申请号：US15057273

申请日：2016-03-01

Applicant: Samsung Electronics Co., Ltd.

Inventor： Sun-Woo Kwon ,  Myung-Jin Lee

IPC: H03M1/00 ,  H03M1/66 ,  H03K17/16 ,  H03M1/08

CPC classification number: H03M1/66 ,  H03M1/08 ,  H03M1/747

Abstract: A current DAC circuit includes a reference current source, a current mirror, a decoder, and one or more current DAC units. The reference current source provides a reference current to a first node. The current mirror includes first and second PMOS transistors configured to provide a copy current generated by copying the reference current to a second node and coupled, at respective drains, to separate nodes. The current mirror may reduce noise of the first and second PMOS transistors through swapping the separate nodes to which the respective drains of the first and second PMOS transistors are connected periodically according to first and second clock signals. The decoder generates one or more enable signals based on a data input signal. One or more current DAC units generate separate positive currents and negative currents based on the copy current and separate enable signals of the one or more enable signals, respectively.

Abstract translation: 电流DAC电路包括参考电流源，电流镜，解码器和一个或多个电流DAC单元。 参考电流源向第一个节点提供参考电流。 电流镜包括第一和第二PMOS晶体管，其被配置为提供通过将参考电流复制到第二节点而产生的复制电流，并在相应的漏极处耦合到分离的节点。 电流镜可以通过交换根据第一和第二时钟信号周期性地连接第一和第二PMOS晶体管的相应的漏极的分离节点来减少第一和第二PMOS晶体管的噪声。 解码器基于数据输入信号产生一个或多个使能信号。 一个或多个电流DAC单元分别基于复制电流和一个或多个使能信号的单独使能信号产生单独的正电流和负电流。