发明名称 |
METHOD OF CALIBRATING A THERMOMETER-CODE SAR A/D CONVERTER AND THERMOMETER-CODE SAR-A/D CONVERTER IMPLEMENTING SAID METHOD |
摘要 |
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. |
申请公布号 |
EP2933925(A1) |
申请公布日期 |
2015.10.21 |
申请号 |
EP20150163376 |
申请日期 |
2015.04.13 |
申请人 |
STMICROELECTRONICS S.R.L. |
发明人 |
GIACOMINI, MAURO;BURGIO, CARMELO |
分类号 |
H03M1/10;H03M1/46 |
主分类号 |
H03M1/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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