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Home > 1.ANALOG, ADC > How the voltage reference affects ADC performance, Part 3

How the voltage reference affects ADC performance, Part 3

By Bonnie Baker, Senior Applications Engineer, and Miro Oljaca, Senior Applications Engineer  from Texas Instruments

This article is Part 3 of a three-part series that investigates the design and performance of a voltage-reference system for a successive-approximation-register (SAR) analog-to- digital converter (ADC). Part 1 (see Reference 1) exam- ined the ADC characteristics and specifications, with a particular interest in the gain error and signal-to-noise ratio, while assessing how the voltage reference impacts the ADC transfer function and DC accuracy. Part 2 (see Reference 2) examined the voltage-reference characteris- tics, focusing on how the voltage-reference noise produces the most error at the converter’s full-scale range. Part 2 concluded by presenting a design for a voltage-reference circuit that is appropriate for 8- to 14-bit converters. This article, Part 3, tackles the challenge of designing a voltage- reference circuit that is appropriate for converters with 16+ bits. Part 3 examines methods of improving noise filtering and of compensating for losses caused by the improved filters.

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Categories: 1.ANALOG, ADC
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