公开(公告)号：US08089380B2

公开(公告)日：2012-01-03

申请号：US12603883

申请日：2009-10-22

Applicant: Roderick McLachlan ,  Samuel Blackburn

Inventor： Roderick McLachlan ,  Samuel Blackburn

IPC: H03M1/10

CPC classification number: H03M1/1019 ,  H03M1/785

Abstract: The invention is a novel scheme of calibrating a voltage-mode digital to analog converter using a current-mode digital to analog converter. A DAC system is comprised of a voltage-mode DAC with an R-2R architecture structure and includes a ROM lookup table where calibration codes associated with each of a plurality of input codes are stored. A reference current is scaled with the calibration codes to output a calibration current that induces adjustments in an output voltage to counteract non-linearities that may be induced by resistor mismatch.

Abstract translation: 本发明是使用电流模式数模转换器校准电压模式数模转换器的新颖方案。 DAC系统由具有R-2R架构结构的电压模式DAC组成，并且包括ROM查找表，其中存储与多个输入代码中的每一个相关联的校准代码。 参考电流用校准代码缩放以输出校准电流，其引起输出电压的调整以抵消可能由电阻器失配引起的非线性。