公开(公告)号：US09191025B1

公开(公告)日：2015-11-17

申请号：US14502360

申请日：2014-09-30

Applicant: STMICROELECTRONICS INTERNATIONAL N.V.

Inventor： Anubhuti Chopra

IPC: H03M1/66 ,  H03M1/68 ,  H03M1/06 ,  H03M1/12 ,  H03M1/46 ,  H03M3/00

CPC classification number: H03M1/687 ,  H03M1/0626 ,  H03M1/0665 ,  H03M1/1245 ,  H03M1/462 ,  H03M3/464

Abstract: In an embodiment, a digital-to-analog converter (DAC) converts an input digital signal into an output analog signal, and includes first and second segments, a combiner, and a controller. The first segment includes a first number of first elements that are configured to generate a first analog signal in response to a first portion of the digital signal, and the second segment includes a second number of second elements that are configured to generate a second analog signal in response to a second portion of the digital signal. The combiner is configured to combine the first analog signal and the second analog signal to generate the output analog signal, and the controller is configured to deactivate one of the first elements and to activate one of the second elements in place of the deactivated first element. For example, such a segmented DAC may be suitable for use in a sigma-delta ADC.

Abstract translation: 在一个实施例中，数模转换器（DAC）将输入数字信号转换为输出模拟信号，并且包括第一和第二段，组合器和控制器。 第一段包括第一数量的第一元件，其被配置为响应于数字信号的第一部分产生第一模拟信号，并且第二段包括第二数量的第二元件，其被配置为产生第二模拟信号 响应于数字信号的第二部分。 组合器被配置为组合第一模拟信号和第二模拟信号以产生输出模拟信号，并且控制器被配置为去激活第一元件中的一个并且激活第二元件中的一个代替去激活的第一元件。 例如，这种分段DAC可适用于Σ-ΔADC。