Resonator-based multi-stage /spl Sigma//spl Delta/ modulator for wideband applications with improved dynamic range |
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Authors: | Chang T-H Dung L-R |
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Affiliation: | Dept. of Electr. & Control Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan; |
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Abstract: | A new design methodology for wideband, multi-stage, multi-bit /spl Sigma//spl Delta/ modulators (/spl Sigma//spl Delta/Ms) with improved dynamic range, is presented. The key to improving dynamic range is to have the first stage oscillated, then the coarse quantisation noise vanishes and hence circuit non-linearities do not cause a leakage quantisation noise problem. Based on the proposed methodology, a fourth-order four-bit /spl Sigma//spl Delta/M can achieve the dynamic range of 80 dB at the OSR of 8 without using additional calibration techniques. |
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