带通采样定理在降低功耗问题中的实际应用  

The Application of Bypass Sampling in Reducing Power Waste

作　　者：李晓陆 

机构地区：[1]海军驻广州地区通信军事代表室,广东广州510656

出　　处：《桂林电子工业学院学报》2004年第5期36-38,共3页Journal of Guilin Institute of Electronic Technology

摘　　要：由带通采样定理和奈奎斯特采样定理可知,在对同一带通数据信号进行采集时,采用带通采样定理的采样频率为fs≥2B(信号带宽),而采用奈奎斯特采样定理的采样频率为fs≥2fH(信号最高频率),带通采样定理的采样频率小。同时运用带通采样定理降低采集频率,能够降低芯片的工作电流,从而降低器件功耗。通过数字下变频芯片HSP50216的应用实例证明,采用该方法可以保持系统良好性能的基础上,有效的降低器件功耗。According to the theorem of bypass sampling,the sampling frequency is fs≥2B.However,according to the theorem of Nyquist Sampling,the sampling frequency is fs≥2f_H.It is clear that the former is less.After analyzing the power dissipation of data sampling,we can find that by applying the bypass sampling theory,the sampling frequency and the working current will be reduced and so does the power dissipation.By using HSP50216,it is proved in this paper that using the bypass sampling theory can not only keep the performance of the system but also reduce the power dissipation obviously.

关 键 词：Nyquist采样 带通采样 数字下变频 

分 类 号：TN91[电子电信—通信与信息系统]