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电子学报  2015 

基于2比特DSM的开关功放电平变换策略研究

DOI: 10.3969/j.issn.0372-2112.2015.07.025, PP. 1413-1417

Keywords: 开关功放,Delta-Sigma调制器,面积等效原理,电平变换

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Abstract:

通过增加量化电平,Delta-Sigma调制器(DSM)能够获得更好的调制性能.但限于开关功放的具体结构,多电平DSM序列无法直接驱动后级功放,本文根据面积等效原理提出了适用于开关功放的一种电平变换策略.理论分析和仿真结果表明,通过采用合适的电平变换方式,变换序列能够获得比常规2电平DSM序列更优的带内SNR性能.

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