公开(公告)号：EP2933925B1

公开(公告)日：2018-03-28

申请号：EP15163376.5

申请日：2015-04-13

Applicant: STMicroelectronics S.r.l.

Inventor： Giacomini, Mauro ,  Burgio, Carmelo

IPC: H03M1/10 ,  H03M1/46 ,  H03M1/68 ,  H03M1/80

CPC classification number: H03M1/0809 ,  H03M1/1033 ,  H03M1/1057 ,  H03M1/1245 ,  H03M1/464 ,  H03M1/466 ,  H03M1/687 ,  H03M1/804 ,  H03M1/806

Abstract: The present disclosure relates to a method of calibrating a thermometer-code SAR-A/D converter, said thermometer-code SAR-A/D converter comprising a N bit -bit digital-to-analog converter (DAC) for outputting a N bit -bit output code, said digital-to-analog converter (DAC) comprising a first subconverter (C MSB ) having a plurality of N Th thermometer elements T j (1) and a second subconverter (C LSB ) having a plurality of N Bin binary-weighted elements (2), wherein said N bit output code is equal to the sum of N BitTh and N BitBin where N Th = 2^N BitTh and N BitBin is equal to N Bin = N BitBin . The calibration method includes the steps of determining (5) an Integral Non-Linearity error value (µ R ) of a R th thermometer-code level of said thermometer elements T j according to the formula: µ R = ˆ‘ j = 0 R - 1 E j - R N th ˆ‘ j = 0 N th - 1 E j where E j represents the relative differences between said plurality of thermometer elements T j and a reference thermometer element T ref selected from said plurality of thermometer elements T j of said digital-to-analog converter (DAC) - minimizing (6) the maximum of said error value µ R to obtain a minimized error value; - generating (7) said output code (OUTPUT) according to said minimized error.

公开(公告)号：EP2933925A1

公开(公告)日：2015-10-21

申请号：EP15163376.5

申请日：2015-04-13

Applicant: STMicroelectronics S.r.l.

Inventor： Giacomini, Mauro ,  Burgio, Carmelo

IPC: H03M1/10 ,  H03M1/46

CPC classification number: H03M1/0809 ,  H03M1/1033 ,  H03M1/1057 ,  H03M1/1245 ,  H03M1/464 ,  H03M1/466 ,  H03M1/687 ,  H03M1/804 ,  H03M1/806

Abstract: The present disclosure relates to a method of calibrating a thermometer-code SAR-A/D converter, said thermometer-code SAR-A/D converter comprising a N bit -bit digital-to-analog converter (DAC) for outputting a N bit -bit output code, said digital-to-analog converter (DAC) comprising a first subconverter (C MSB ) having a plurality of N Th thermometer elements T j (1) and a second subconverter (C LSB ) having a plurality of N Bin binary-weighted elements (2), wherein said N bit output code is equal to the sum of N BitTh and N BitBin where N Th = 2^N BitTh and N BitBin is equal to N Bin = N BitBin . The calibration method includes the steps of determining (5) an Integral Non-Linearity error value (ε R ) of a R th thermometer-code level of said thermometer elements T j according to the formula: ε R = ∑ j = 0 R - 1 E j - R N th ∑ j = 0 N th - 1 E j where E j represents the relative differences between said plurality of thermometer elements T j and a reference thermometer element T ref selected from said plurality of thermometer elements T j of said digital-to-analog converter (DAC)
- minimizing (6) the maximum of said error value ε R to obtain a minimized error value;
- generating (7) said output code (OUTPUT) according to said minimized error.

Abstract translation: 本发明涉及一种校准温度计代码SAR A / D转换器的方法，所述温度计代码SAR A / D转换器，包括N个比特位的数字 - 模拟输出婷N个位转换器（DAC） 位输出代码，所述数字 - 模拟转换器（DAC），包括第一子转换器具有N个滨的多元性（C MSB）具有第n个温度计元件T J（1）的多元和第二子转换器（C LSB） 二进制加权元件（2），worin所述n位输出码等于N和N第一点BitBin的总和，其中N TH = 2 ^ N第一点和N BitBin等于N = N滨BitBin。 该校准方法包括确定性开采（5），以积分非线性误差值（μR）一个R TH。所述温度计元件T J雅丁的温度计代码级式的步骤：μR =“J = 0 R - 图1e的J - RN个“J = 0第N - 1个C j，其中ëĴdarstellt温度计元件T j和从参考选择的参考温度计元素T的所述多个之间的相对差异所述TJ的温度计元件的多元性 所述数字 - 模拟转换器（DAC） - 最小化（6）的最大所述误差值的率μr，以获得最小化的误差值; - 生成（7）所述输出码（OUTPUT）雅丁于所述的最小化误差。