Improved design method for continuous-time quadrature bandpass /spl Sigma//spl Delta/ ADCs |
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Authors: | Reekmans S De Maeyer J Rombouts P Weyten L |
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Affiliation: | CAS-Group, Gent Univ., Belgium; |
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Abstract: | In continuous-time quadrature bandpass /spl Sigma//spl Delta/ ADCs it is desirable to limit the number of cross-couplings. This can be achieved by implementing the loop as a cascade of complex integrators with only real coefficients. It is shown that this may result in a very poor approximation of the desired noise transfer function, because the effect of the DAC pulse is not taken into account correctly. A simple implementation that solves this problem is proposed. |
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