公开(公告)号：US20030231130A1

公开(公告)日：2003-12-18

申请号：US10172376

申请日：2002-06-14

Applicant: STMicroelectronics S.r.I.

Inventor： Pierangelo Confalonieri ,  Marco Zamprogno ,  Francesca Girardi

IPC: H03M001/38 ,  H03M001/10

CPC classification number: H03M1/181 ,  H03M1/468

Abstract: A method of operating an SAR-type analog-to-digital converter to match the dynamic range of an input voltage signal to be converted with the full scale range of the converter, the converter including at least one array of binary weighted capacitors. The method includes the step of obtaining a digital gain code that represents the ratio between the full scale range and the dynamic range of the voltage signal to be converted, applying the voltage signal to be converted to the capacitor array so as to charge with the voltage signal to be converted only those array capacitors having the same binary weights as the bits of the gain code that have a selected binary value, and selectively coupling the capacitors of the array to one of a first and second predetermined reference voltage terminals according to an SAR technique, to obtain an output digital code corresponding to the input voltage signal.

Abstract translation: 一种操作SAR型模数转换器以匹配要转换的输入电压信号的动态范围与转换器的满量程范围的方法，所述转换器包括至少一个二进制加权电容器阵列。 该方法包括获得数字增益代码的步骤，该数字增益代码表示满量程范围和要转换的电压信号的动态范围之间的比率，将要转换的电压信号施加到电容器阵列，以便对电压进行充电 信号仅转换具有与具有选定二进制值的增益码的位相同的二进制权重的阵列电容器，并且根据SAR选择性地将阵列的电容器耦合到第一和第二预定参考电压端子之一 技术，以获得对应于输入电压信号的输出数字代码。