Effect of switch charge injection on /spl Sigma//spl Delta/ modulator

1995 IEEE TENCON. IEEE Region 10 International Conference on Microelectronics and VLSI. 'Asia-Pacific Microelectronics 2000'. Proceedings Pub Date : 1995-11-06 DOI:10.1109/TENCON.1995.496354

Y. Xu, G. Rigby, M. Starr

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Abstract

The effect of switch charge injection on a second-order /spl Sigma//spl Delta/ modulator has been investigated. It has been found that the switch charge injection can cause an error at the output of the SC integrator and that this integrator error can significantly degrade the dynamic range of the oversampling /spl Sigma//spl Delta/ modulator. The integrator error depends on the switch and the integrating capacitor sizes and the common-mode rejection performance of the op-amp. The differential signal at the input of the modulator can also affect the switch charge injection.

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开关电荷注入对/spl Sigma//spl Delta/调制器的影响

研究了开关电荷注入对二阶/spl Sigma//spl Delta/调制器的影响。已经发现，开关电荷注入会在SC积分器的输出处引起误差，并且该积分器误差会显著降低过采样/spl Sigma//spl Delta/调制器的动态范围。积分器误差取决于开关和积分器电容的尺寸以及运放的共模抑制性能。调制器输入端的差分信号也会影响开关电荷注入。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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1995 IEEE TENCON. IEEE Region 10 International Conference on Microelectronics and VLSI. 'Asia-Pacific Microelectronics 2000'. Proceedings

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