Invention Grant
US09432041B2 Method of calibrating a thermometer-code SAR A/D converter and thermometer-code SAR-A/D converter implementing said method
有权
校准温度计代码SAR A / D转换器和实施所述方法的温度计代码SAR-A / D转换器的方法
- Patent Title: Method of calibrating a thermometer-code SAR A/D converter and thermometer-code SAR-A/D converter implementing said method
- Patent Title (中): 校准温度计代码SAR A / D转换器和实施所述方法的温度计代码SAR-A / D转换器的方法
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Application No.: US14683325Application Date: 2015-04-10
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Publication No.: US09432041B2Publication Date: 2016-08-30
- Inventor: Mauro Giacomini , Carmelo Burgio
- Applicant: STMICROELECTRONICS S.r.l.
- Applicant Address: IT Agrate Brianza (MB)
- Assignee: STMICROELECTRONICS S.R.L.
- Current Assignee: STMICROELECTRONICS S.R.L.
- Current Assignee Address: IT Agrate Brianza (MB)
- Agency: Allen, Dyer, Doppelt, Milbrath & Gilchrist, P.A.
- Priority: ITMI2014A0720 20140417
- Main IPC: H03M1/10
- IPC: H03M1/10 ; H03M1/08 ; H03M1/12 ; H03M1/46 ; H03M1/68 ; H03M1/80
Abstract:
A method of calibrating a thermometer-code SAR-A/D converter is provided. The thermometer-code SAR-A/D converter includes an Nbit-bit digital-to-analog converter (DAC) for outputting an Nbit-bit output code. The DAC includes a first subconverter having a plurality of NTh thermometer elements Tj and a second subconverter having a plurality of NBin binary-weighted elements. The Nbit output code is equal to the sum of NBitTh and NBitBin where NTh=2NBitTh and NBitBin is equal to NBin=NBitBin. The calibration method includes determining an Integral Non-Linearity error value (εR) of an Rth thermometer-code level of the thermometer elements. The method further includes reducing the highest of the error value εR to obtain a reduced error value, and generating the output code according to said reduced error.
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