摘要
为了提升射频数字功放整体效率,需要降低前端△∑调制器(DSM)输出的平均切换频率,以减少功放的切换损耗。基于滞环比较思想在DSM中提出了一种可变门限量化策略,并通过理论和仿真分析了该策略下DSM输出的平均切换速率以及带内SNR性能。结果表明,采用所提出的量化策略,在带内SNR减少有限的情况下,能够有效降低DSM输出的平均切换频率。
In order to improve the efficiency of RF digital power amplifier,it is necessary to limit the amplifier＇s switch loss by reducing the average transition frequency of delta-sigma modulator （DSM） output.By using the hysteresis,a quantization strategy with alterable thresholds for DSM is proposed and analyzed in this paper.Simulation results show that the DSM output＇s average transition frequency（ATF） can be reduce effectively with little SNR decline by using the proposed quantization strategy.
出处
《电子技术应用》
北大核心
2014年第12期49-52,共4页
Application of Electronic Technique
基金
中国博士后科学基金资助项目(2013M532239)
