High-efficiency power amplifier for wireless sensor networks
High-efficiency power amplifier for wireless sensor networks
复制标题
用于无线传感器网络的高效功率放大器
DOI：
10.1109/iscas.2005.1465981
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
F. Maloberti
中科院分区：
文献类型：
--
作者：
D. Y. Aksin;S. Gregori;F. Maloberti
设计了一种用于无线网络化微传感器系统的高效率E类开关功率放大器。在该系统中，每个传感器都使用微电池运行，具有本地处理能力，并且在同一芯片上集成了传感元件和RF发射器，大部分功率都由发射器消耗。该放大器的最大漏极效率达到92.4%，发射功率在-4.2 ~-0.2dBm之间变化，效率几乎恒定。通过控制调制占空比和切换并联电路中的电容器值来获得最后一个特征。根据与基站或其他传感器的距离以及电池的充电水平来选择发射功率的可能性与功率感知网络协议相结合，提高了网络寿命、可靠性和适应性。该放大器采用0.18 /spl mu/m CMOS工艺设计，采用标称1.2 V电源供电。
We designed a high-efficiency class-E switched-mode power amplifier for a wireless networked micro-sensor system. In this system, where each sensor operates using a micro-battery, has local processing capability, and contains on the same chip integrated sensing elements and an RF transmitter, most of the power is dissipated by the transmitter. The proposed amplifier achieves 92.4% maximum drain efficiency and can vary the transmitted power between -4.2 to -0.2 dBm with almost constant efficiency. This last feature is obtained by controlling the modulation duty cycle and by switching the capacitors' values in the parallel circuit. The possibility of choosing the transmitted power depending on the distance from a base station or other sensors and on the charge level of the battery, combined with power aware network protocols, improves network lifetime, reliability, and adaptability. The amplifier is designed in 0.18 /spl mu/m CMOS process and operates with a nominal 1.2 V supply.