医疗植入式无线传感系统的低功耗接收机电路设计

Design of Low Power Receiver Circuit for Medical Implantable Wireless Sensor Systems

针对医疗植入式无线传感系统低电压、低功耗和小尺寸的需求设计了一种接收机电路。所设计的接收机电路能工作于0.5V电源电压下,有利于充分利用无线采集能量;提出一种可调式比例因子检波器,有利于平衡功耗和敏感度性能;匹配网络采用可编程设计,使得接收机在100MHz带宽内都能正常工作。此接收机采用中芯国际的0.18μm CMOS工艺流片,测试结果显示整体功耗为42μW,占用芯片面积仅为0.5cm×0.7cm,而且无需采用任何片外晶振和匹配网络,易于集成,尤其适合植入性医疗系统设计。

According to the requirements of low supply voltage,low power consumption and small size,a receiver circuit for medical implantable wireless sensor systems was designed.The proposed receiver circuit could work under the 0.5V power supply voltage,which was beneficial to the full use of wireless acquisition energy.An adjustable proportional factor detector was proposed to provide a better trade-off between power consumption and sensitivity.The matching network was programmable to ensure the receiver operated in the 100MHz bandwidth.The entire receiver used in SMIC 0.18μm CMOS process.The test results show that the overall power consumption is 42μW,the occupied area of the chip is only 0.5cm×0.7cm,and it is easy to integrate without any off-chip crystal vibration and matching network,especially suitable for the design of the implant medical system.