Circuit Design for Realization of a 16 bit 1MS/s Successive Approximation Register Analog-to-Digital Converter

Brenneman, Cody R.

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Circuit Design for Realization of a 16 bit 1MS/s Successive Approximation Register Analog-to-Digital Converter

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As the use of digital systems continues to grow, there is an increasing need to convert analog information into the digital domain. Successive Approximation Register (SAR) analog-to-digital converters are used extensively in this regard due to their high resolution, small die area, and moderate conversion speeds. However, capacitor mismatch within the SAR converter is a limiting factor in its accuracy and resolution. Without some form of calibration, a SAR converter can only reasonably achieve an accuracy of 10 bits. The Split-ADC technique is a digital, deterministic, background self-calibration algorithm that can be applied to the SAR converter. This thesis describes the circuit design and physical implementation of a novel 16-bit 1MS/s SAR analog-to-digital converter for use with the Split-ADC calibration algorithm. The system was designed using the Jazz 0.18um CMOS process, successfully operates at 1MS/s, and consumes a die area of 1.2mm<SUP>2</SUP>. The calibration algorithm was applied, showing an improvement in the overall accuracy of the converter.

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