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Linearity enhancement of multibit ΔΣ A/D and D/A converters using data weighted averaging

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2 Author(s)
R. T. Baird ; Crystal Semicond. Corp., Austin, TX, USA ; T. S. Fiez

A dynamic element matching algorithm, data weighted averaging, is introduced for use in multibit ΔΣ data converters. Using this algorithm, distortion spectra from DAC linearity errors are shaped by first-order noise shaping, resulting in a dynamic range improvement of 9 dB/octave when DAC errors dominate. Combining this technique with random dithering nearly eliminates the aliasing of the DAC errors into the baseband. Simulations show that with only 1% element matching 110 dB signal-to-noise ratio (18 b) is achieved for a third-order 3-b modulator with an oversampling ratio of 128

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IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing  (Volume:42 ,  Issue: 12 )