| 引用本文: | 周强,朱蕾,陈剑斌.4电平S类数字功放的电平合成策略.[J].国防科技大学学报,2020,42(2):156-161.[点击复制] |
| ZHOU Qiang,ZHU Lei,CHEN Jianbin.Level synthesis strategy for 4-level class-S digital power amplifier[J].Journal of National University of Defense Technology,2020,42(2):156-161[点击复制] |
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| 4电平S类数字功放的电平合成策略 |
| 周强,朱蕾,陈剑斌 |
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(国防科技大学 第六十三研究所, 江苏 南京 210007)
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| 摘要: |
| 通过增加量化电平,Delta-Sigma调制器输出序列能够获得更好的调制性能。但在S类数字功放中,受限于开关功放的实现结构,多电平Delta-Sigma调制器输出脉冲序列无法直接驱动开关功放,需采用由多个开关功放单元构成的多电平开关功放。针对2比特Delta-Sigma调制器输出序列,分析了电平合成策略对4电平S类数字功放性能的影响,提出了两种优化的电平合成策略。理论分析和仿真结果表明,采用合适的电平合成策略,4电平S类数字功放可以获得更优的输出性能,尤其在输出功率回退状态下,电平合成策略对功放性能的影响更为显著。 |
| 关键词: 数字射频功放 S类 Delta-Sigma调制器 开关功放 电平合成 |
| DOI：10.11887/j.cn.202002021 |
| 投稿日期：2018-11-26 |
| 基金项目:国家自然科学基金资助项目(61631021) |
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| Level synthesis strategy for 4-level class-S digital power amplifier |
| ZHOU Qiang, ZHU Lei, CHEN Jianbin |
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(The Sixty-third Research Institute, National University of Defense Technology, Nanjing 210007, China)
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| Abstract: |
| The DSM (Delta-Sigma modulator) can get a better performance by increasing the quantizer′s levels. But the multi-bit DSM output cannot drive the SMPA (switch-mode power amplifiers) directly due to the multi-levels of DSM output in the class-S DPA (digital power amplifier). So the multi-level SMPA with multiple SMPA cells is needed. Several level synthesis strategies for 4-level class-S DPA based on 2 bit DSM were proposed and analyzed. The theory and simulation results show that, with an appropriate level synthesis scheme, the 4-level class-S DPA obtains a much better performance. Especially, the effect of level synthesis strategy is more remarkable in power back-off condition. |
| Keywords: digital power amplifier class-S Delta-Sigma modulator switched-mode power amplifier level synthesis |
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