Tunable N-path mismatch shaping for multibit bandpass delta-sigma modulators

Many radio applications require the use of programmable bandpass ¿¿ converter. In the digital-to-analog converter (DAC) used within a ¿¿ converter, non-linearities created by DAC element mismatch error can be spectrally shaped to fall outside the signal band. The mismatch shapers within these converters thus also need to be programmable in order to follow the signal band. This paper proposes a new technique that tunes the center frequency of a mismatch noise transfer function while using an arbitrary mismatch shaping algorithm.