公开(公告)号：US06529152B1

公开(公告)日：2003-03-04

申请号：US09901845

申请日：2001-07-09

Applicant: Douglas S. Piasecki ,  Ka Y. Leung

Inventor： Douglas S. Piasecki ,  Ka Y. Leung

IPC: H03N166

CPC classification number: H03M1/682 ,  H03M1/46 ,  H03M1/765

Abstract: A digital-to-analog converter having a semiconductor resistor strip with plural voltage taps. One voltage tap formed of the semiconductor material defines a nonzero reference voltage for the converter. An auto-zeroing amplifier is utilized to charge a coupling capacitor to the nonzero reference voltage. In the conversion process, the analog voltages at the other voltage taps of the resistor strip are selected via a switch arrangement and coupled to the coupling capacitor. The linearity of the digital-to-analog converter is thus more independent of parasitic resistances that may be formed in the ground connection to the resistor string.

Abstract translation: 具有具有多个电压抽头的半导体电阻条的数 - 模转换器。 由半导体材料形成的一个电压抽头为转换器定义非零参考电压。 利用自动归零放大器将耦合电容器充电到非零参考电压。 在转换过程中，电阻条的其他电压抽头上的模拟电压经由开关装置选择并耦合到耦合电容器。 因此，数 - 模转换器的线性度与在与电阻串的接地连接中可能形成的寄生电阻更独立。