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Abstract:
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Oversampled digital -to -analog converters typically employ an array of unit elements to drive out the analog signal . Manufacturing defects can create errors due to mismatch between the unit elements , leading to a sharp reduction in the effective dynamic range through the converter . Mismatch noise shaping is an established technique for alleviating these effects , but usually anchors the signal band to a fixed frequency location . In order to extend these advantages to tunable applications , this work explores a series of techniques that allow the suppression band of the mismatch noise shaping function to have an adjustable center frequency . The proposed techniques are implemented in hardware and evaluated according to mismatch shaping performance , latency and hardware complexity . |