Sigma-Delta 调制器的建模、分析和设计 |
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引用本文: | 葛彬杰,王新安,张兴,冯晓星,汪清勤.Sigma-Delta 调制器的建模、分析和设计[J].半导体学报,2010,31(9):095003-5. |
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作者姓名: | 葛彬杰 王新安 张兴 冯晓星 汪清勤 |
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摘 要: | This paper introduces a new method for SC sigma–delta modulator modeling. It studies the integrator's different equivalent circuits in the integrating and sampling phases. This model uses the OP-AMP input pair's tail current (I0) and overdrive voltage (von) as variables. The modulator's static and dynamic errors are analyzed. A group of optimized I0 and von for maximum SNR and power × area ratio can be obtained through this model. As examples, a MASH21 modulator for digital audio and a second order modulator for RFID baseband are implemented and tested, and they can achieve 91 dB and 72 dB respectively, which verifies the modeling and design criteria.
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关 键 词: | sigma-delta 建模 瞬态响应 优化 |
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