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Method and apparatus to reduce effect of dielectric absorption in SAR ADC

A digital-to-analog converter and converter technology, applied in the direction of analog-to-digital conversion, analog-to-digital conversion, analog/digital conversion calibration/test, etc.

Active Publication Date: 2018-03-30
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the time domain, dielectric absorption can cause increased time delay due to capacitive discharge over time

Method used

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  • Method and apparatus to reduce effect of dielectric absorption in SAR ADC
  • Method and apparatus to reduce effect of dielectric absorption in SAR ADC
  • Method and apparatus to reduce effect of dielectric absorption in SAR ADC

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Embodiment Construction

[0025] Among other things, the inventors have realized that as geometries shrink, dielectric absorption effects become more prominent. For smaller geometries, even metal-insulator-metal (MIM) capacitors exhibit dielectric absorption. In a digital-to-analog converter (SAR ADC) embodiment, based on acquisition time and temperature, previously stored digitized values ​​may be scaled to produce scaled values ​​that adjust later digitized values ​​during successive approximation in order to mitigate the effects of dielectric absorption influences. In another SAR ADC embodiment, during successive approximation, the capacitance between the forward digital-to-analog converter (PDAC) and the negative-direction analog converter (NDAC) can be shuffled to mitigate the effect of dielectric absorption.

[0026] figure 1 is an illustrative circuit schematic showing differential SAR ADC 102 in accordance with some embodiments. Differential SAR ADC 102 includes differential comparator 104, ...

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Abstract

The invention relates to a method and an apparatus to reduce effect of dielectric absorption in a successive approximation register analog to digital converter (SAR ADC). The successive approximationregister analog to digital converter (SAR ADC) is provided in which impact of dielectric absorption is reduced with a correction circuit configured to adjust a present digital code value signal basedat least in part upon a previous digital code value signal, an acquisition time and temperature.

Description

Background technique [0001] An analog-to-digital converter (ADC) generates a multi-bit digital value from an analog signal. Successive Approximation (SAR) A SAR ADC samples an input voltage and compares it to a sequence of voltages to generate a digital representation of the input voltage. A SAR ADC includes at least one capacitor array to generate a voltage sequence. [0002] Dielectric absorption is an inherent characteristic of capacitors, which partially recharge shortly after the capacitor is discharged. The dielectric absorption phenomenon is the result of dipoles or electrical relaxation in the dielectric material disposed between opposing capacitive plates. In an ideal dielectric, internally polarized dipoles form and dissipate instantaneously in response to changes in the applied electric field. However, in an actual dielectric, the physical movement of charges that are the origin of dipoles requires time, and the length of time required depends on the mechanism of...

Claims

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Application Information

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IPC IPC(8): H03M1/10H03M1/46
CPCH03M1/1019H03M1/468H03M1/1042H03M1/0617H03M1/1245H03M1/38H03M3/378
Inventor S·莫南吉M·马德黑文
Owner ANALOG DEVICES INT UNLTD