A novel technique for tunable mismatch shaping in oversampled digital-to-analog converters

Over-sampled digital-to-analog converters typically employ a unit-element architecture to drive out the analog signal. Performance can suffer from errors due to mismatch between unit elements, leading to a sharp drop in the achievable signal-to-noise ratio (SNR). Mismatch noise shaping is an established technique for overcoming these limitations, but usually anchors the signal band to a fixed location. In order to extend these advantages to tunable applications, this paper presents a novel technique that allows the mismatch noise shaping transfer function to have an adjustable center frequency.