Resolution enhancement of analog-to-digital converters through computationally simple digital filtering Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mw22v8919

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  • The resolution of analog-to-digital converters can be distinguished as absolute resolution, or average resolution. This study reviews average resolution enhancement techniques and proposes a method which is particularly applicable as a low-cost modification to a high-speed waveform acquisition system. This method uses oversampling combined with computationally simple digital filtering to enhance the average resolution of an analog-to-digital (A/D) converter, while maintaining an absolute resolution which is at least that of the unmodified system. The average resolution enhancement is approximately 1/2 log₂(N) - 1/4 bits, where N is the oversampling ratio. The simple digital filter is also shown to be useful in reducing alias errors when sample rates are reduced to near Nyquist rates. Additive dither signals are shown to be useful in maintaining expected resolution enhancement for certain input signals.
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