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Low-Power 2.4-GHz Transceiver With Passive RX Front-End and 400-mV Supply
介绍了一款超低功耗2.4GHz收发器，适用于无线传感器网络。
400-mV supply, 7-dB noise figure, 7.5-dBm IIP3, 330 μW
超低功耗2.4GHz无线传感器网络被动接收前端谐振匹配网络
▸创新点1：全被动接收前端设计（电路创新）。该设计摒弃传统有源放大器，采用全被动结构实现电压增益，显著降低功耗至330μW（400mV供电），同时保持7dB噪声系数和7.5dBm IIP3性能，解决了无线传感器网络对超低功耗的需求。
▸创新点2：集成谐振匹配网络（方法创新）。通过LC谐振网络实现天线与被动混频器间的阻抗匹配，直接产生电压增益并优化信号传输效率，该结构在2.4GHz频段实现高效能转换，减少传统有源匹配的功耗开销。
▸创新点3：被动混频器干扰抑制机制（系统创新）。利用混频器输入阻抗特性，在开关频率处形成等效高Q值LC滤波器响应，可抑制带外干扰，论文推导的阻抗模型揭示了其干扰抑制潜力，为无源接收机抗干扰设计提供新思路。
▸创新点4：400mV超低电压供电架构（电路创新）。整个收发器在400mV电源电压下工作，通过优化被动前端和二进制FSK发射机（PA效率达45%）的协同设计，实现系统级能效提升（整体效率30%），突破低压供电限制。
Abstract
An ultra low power 2.4-GHz transceiver targeting wireless sensor network applications is presented. The receiver front-end is fully passive, utilizing an integrated resonant matching network to achieve voltage gain and interface directly to a passive mixer. The receiver achieves a 7-dB noise figure and 7.5-dBm IIP3 while consuming 330 W from a 400-mV supply. The binary FSK transmitter delivers 300 W to a balanced 50- /10load with 30% overall efficiency and 45% power amplifier (PA) efficiency. Performance of the receiver topology is analyzed and simple expressions for the gain and noise figure of both the passive mixer and matching network are derived. An analysis of passive mixer input impedance reveals the potential to reject interferers at the mixer input with characteristics similar to an extremely high- parallel LC filter centered at the switching frequency.