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    题名: A Wideband Cascaded Sigma-Delta Modulator with Improved Non-linearity Effects
    作者: 江正雄;Chiang, Jen-shiun;Chou, Pao-chu;Chang, Teng-hung
    贡献者: 淡江大學電機工程學系
    日期: 2003-08-01
    上传时间: 2011-10-15 00:55:58 (UTC+8)
    摘要: This work presents a wideband cascaded sigma-delta modulator (CLFSDM) that reduces the nonlinearity effects of components. This architecture offers a new noise-shaping function to achieve high resolution in wideband applications and reduce digital-analogue converter (DAC) mismatch from the multi-bit feedback. Moreover, the error cancellation schemes can be added in the digital circuit part to cancel the coarse quantization errors and thus effectively reduce the non-ideal effects such as DAC mismatch. The mismatches between the two stages, such as in the gain error and pole error, may seriously degrade performance. The blind on-line calibration technique is used to eliminate these imperfect analogue circuit errors in the digital circuit. Accordingly, this architecture can reduce the over sampling ratio (OSR), and the in-band noise can be significantly suppressed to achieve a high resolution in Matlab and Switcap2 simulations. Simulation results indicate this sigma-delta modulator is very efficient in wide bandwidth applications.
    關聯: International Journal of Electronics 90(4), pp.255-275
    DOI: 10.1080/00207210310001597126
    显示于类别:[電機工程學系暨研究所] 期刊論文

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