公开(公告)号：US08576101B1

公开(公告)日：2013-11-05

申请号：US13668706

申请日：2012-11-05

Applicant: Google Inc.

Inventor： Cheng-Yi Andrew Lin ,  Arnold Feldman

IPC: H03M1/06

CPC classification number: H03M1/1042 ,  H03M1/1047 ,  H03M1/785

Abstract: A R2R ladder circuit implementation of a digital-to-analog convertor (DAC) may be configured to compensate for mismatch in each of a plurality of current sources in the R2R ladder circuit. The compensating of mismatch in each of the plurality of current sources may be achieved by adding one or more auxiliary current sources associated with each of the plurality of current sources, which may be used to provide pre-configured auxiliary current that would enable compensating for mismatch in current of an associated one of the plurality of current sources. For example, each of the plurality of current sources may have two auxiliary current sources, connected in parallel therewith, with one of two auxiliary current sources being switched to the positive-side and the other auxiliary current source being switched to the negative-side. The switching structure of the modified R2R ladder circuit may be implemented in any semiconductor technology (e.g., BiCMOS technology).

Abstract translation: 数模转换器（DAC）的R2R梯形电路实现可以被配置为补偿R2R梯形电路中的多个电流源中的每一个中的失配。 可以通过添加与多个电流源中的每一个相关联的一个或多个辅助电流源来实现对多个电流源中的每一个的失配的补偿，其可用于提供预配置的辅助电流，其能够补偿不匹配 在多个电流源中的相关联的一个的电流中。 例如，多个电流源中的每一个可以具有与其并联连接的两个辅助电流源，其中两个辅助电流源中的一个切换到正侧，另一个辅助电流源切换到负极侧。 修改的R2R梯形电路的开关结构可以在任何半导体技术（例如，BiCMOS技术）中实现。