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Method for analog-digital conversion and analog-digital converter

A technology of analog-to-digital conversion and capacitors, which is applied in the electronic field and can solve problems such as inaccurate digital signals

Active Publication Date: 2018-06-08
SHENZHEN GOODIX TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, there is an offset voltage V in this conventional SAR ADC off The resulting error makes the output digital signal inaccurate

Method used

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  • Method for analog-digital conversion and analog-digital converter

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Embodiment Construction

[0024] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0025] image 3 A schematic flowchart of a method 100 for analog-to-digital conversion according to an embodiment of the present application is shown, the method 100 may be performed by a SAR ADC, specifically, for example, the SAR ADC may be figure 1 As shown in the SAR ADC, the SAR ADC includes a capacitor array and a comparator, wherein the capacitor array includes n capacitors connected in parallel. The SAR ADC also includes a controller, which can be used to execute the method 100, specifically, the controller can be a logic circuit or ..., for example, as figure 1 The logic circuit included in the shown SAR ADC, optionally, the controller may include several related switches, and the controller may further control the connection relationship of various parts of the SAR ADC by controlling these switches.

[0026] Such as i...

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Abstract

The present invention relates to a method for analog-digital conversion and an analog-digital converter. The method is applied to an SAR ADC comprising a capacitor array and a comparator, and the capacitor array comprises n capacitors which are connected in parallel. The method comprises the steps of: employing a successive approximation method to determine an error array corresponding to an offset voltage of the SAR ADC; according to the error array, determining a first reference voltage V'j corresponding to a jth capacitor in the n capacitors; and after a sampling phase of analog signals tobe converted being subjected to sampling, and employing the successive approximation method to convert the analog signals to be converted to target digital signals, wherein in the sampling phase, thefirst end of each capacitor of the n capacitor is connected with the analog signals to be converted, and the second end of the jth capacitor is connected with the first reference voltage V'j. The method for analog-digital conversion and the analog-digital converter achieve self-elimination of the offset voltage without adding extra circuits.

Description

technical field [0001] The present application relates to the field of electronic technology, in particular to a method for analog-to-digital conversion and an analog-to-digital converter. Background technique [0002] Successive approximation register (SAR) analog to digital converters (analog to digital converters, ADC) can convert an analog signal into a digital signal. General, such as figure 1 As shown, the SAR ADC includes a comparator, a digital-to-analog converter (Digital-to-analog converter, DAC) and a logic circuit, wherein the DAC may include a capacitor array, such as figure 2 As shown, the capacitor array may include n capacitors connected in parallel. The basic principle of SAR ADC converting analog signal to digital signal is: convert the analog input signal V in with reference voltage V ref For comparison, the reference voltage is determined according to the output of the DAC, and the comparator decides to increase or decrease the digital signal input t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/06H03M1/46
CPCH03M1/0607H03M1/468
Inventor 李博
Owner SHENZHEN GOODIX TECH CO LTD
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