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Quadrature Mismatch Shaping for Digital-to-Analog Converters

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4 Author(s)
Reekmans, S. ; Dept. of Electron. & Inf. Syst., Ghent Univ. ; De Maeyer, J. ; Rombouts, P. ; Weyten, L.

Quadrature sigma-delta analog-to-digital converters require a feedback path for both the I and the Q parts of the complex feedback signal. If two separate multibit feedback digital-to-analog converters (DACs) are used, mismatch among the unit DAC elements leads to additional mismatch noise in the output spectrum as well as an I/Q imbalance. This paper proposes new quadrature bandpass (QBP) mismatch shaping techniques. In our approach, the I and Q DACs are merged into one complex DAC, which leads to near-perfect I/Q balance. To select the unit DAC elements of the complex multibit DAC, the well-known butterfly shuffler and tree structure are generalized towards a complex structure, and necessary constraints for their correct functioning are derived. Next, a very efficient first-order QBP shaper implementation is proposed. Finally, the newly presented complex structures are simulated to prove their effectiveness and are compared with each other with respect to performance

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:53 ,  Issue: 12 )