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Method of calibrating sar-a/d converter and sar-a/d converter implementing said method

A converter, analog converter technology, applied in the self-calibration of digital-to-analog converter DAC, mixed thermometer code-binary code SAR-A/D converter field

Active Publication Date: 2019-03-19
STMICROELECTRONICS SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] Of course, if the thermometer element measurements are not made with extreme accuracy, the INL Thermo invalid value
[0026] Another issue is the area occupied by the switches used to switch the thermometer element

Method used

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  • Method of calibrating sar-a/d converter and sar-a/d converter implementing said method
  • Method of calibrating sar-a/d converter and sar-a/d converter implementing said method
  • Method of calibrating sar-a/d converter and sar-a/d converter implementing said method

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Embodiment Construction

[0037] Each feature described with reference to a particular embodiment should be intended to be complementary to and / or interchangeable with other features described with reference to other exemplary embodiments, even if not expressly stated otherwise.

[0038] Hereinafter, for the sake of brevity, the same numerical values ​​will be used to refer to parts described about the prior art.

[0039] Given the minimized INL Thermo value without the use of dedicated or additional hardware, the thermometer element T j The redundancy of the actuation sequence is a key factor for efficient self-calibration of the SAR-A / D converter.

[0040] In particular, all actuation sequences are identical (because all elements must be identical, i.e. when N BitBin 64LSB when bits are equal to 6), but they are actually slightly different so that any change in the actuation sequence of the elements involves a change in the output code of the ADC.

[0041] As mentioned above, the error between the...

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Abstract

The present disclosure relates to methods for self-calibration of successive approximation register analog-to-digital converters. The method includes measuring an error value for each of the plurality of thermometer elements and determining an average of the measured error values. The method also includes generating a thermometer scale, wherein each level of the thermometer scale is an incremental sum of each value in the first subset, and each additional level of the thermometer scale is all of the second subset The sum of the values ​​plus the incremental sum of the elements in the first subset in any order. Additionally, the method includes generating an output code based on a thermometer scale.

Description

technical field [0001] The present disclosure relates to a method of self-calibration of a successive approximation register analog-to-digital (SAR-A / D) converter and a SAR-A / D converter implementing the method. In particular, the present disclosure relates to a method of self-calibration of a hybrid thermometer code-binary code SAR-A / D converter and such a hybrid thermometer code-binary code SAR-A / D converter. More particularly, the present disclosure relates to a method of self-calibration of a digital-to-analog converter DAC as part of a thermometer-coded SAR-A / D converter to optimize the integral nonlinearity of the analog-to-digital converter. Background technique [0002] SAR-to-A / D converters are known in the art for analog-to-digital conversion. In this type of transformer, the transform is based on a dichotomic search of all possible quantization levels to determine the final transform value. [0003] refer to figure 1 , which shows a block diagram of a classical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/38
CPCH03M1/1033H03M1/466H03M1/687H03M1/804H03M1/806H03M1/00H03M1/0695H03M1/1047H03M1/12H03M1/1245H03M1/462H03M1/802H03M1/808
Inventor C·布尔焦M·贾科米尼
Owner STMICROELECTRONICS SRL
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