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Interpolation of Microcontroller ADC by self-induced dithering

Journal article
Authors Lars Bengtsson
Published in International Journal on Smart Sensing and Intelligent Systems
Volume 6
Issue 4
Pages 1366-1382
ISSN 1178-5608
Publication year 2013
Published at Department of Physics (GU)
Pages 1366-1382
Language en
Links www.s2is.org/Issues/v6/n4/papers/pa...
Keywords ADC, dithering, resolution, microcontroller, quantization, noise
Subject categories Electronic measurement and instrumentation, Embedded Systems, Electronics

Abstract

The resolution of ADCs (Analog- to -Digital Converters) can be improved by dithering, i.e. by intentionally injecting white noise into the analog signal. This work describes the theory behind dithering, how to optimize the magnitude of the noise and also a design that illustrates how dithering can be implemented to increase the resolution of a microcontroller’s ADC. In order to demonstrate the potential of the design, the resolution of the 10-bit ADC of a PIC18F458 microcontroller is increased to 12 bits by dithering. This is possible by oversampling and decimation. The great advantage of the proposed design is that the noise is generated by the microcontroller itself, obviating the need of an external noise source

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