低功耗人体通信射频收发器的设计

Low Power Single-Chip RF Transceiver for Human Body Communication

Human body communication is proposed as a promising body proximal communication technology for body sensor networks. To achieve low power and small volume in the sensor nodes, a Radio Frequency (RF) application-specific integrated circuit transceiver for Human Body Communication (HBC) is presented and the characteristics of HBC are investigated. A high data rate On-Off Keying (OOK)/Frequency-Shift Keying (FSK) modulation protocol and an OOK/FSK demodulator circuit are introduced in this paper, with a data-rate-to-carrier-frequency ratio up to 70% . A low noise amplifier is proposed to handle the dynamic range problem and improve the sensitivity of the receiver path. In addition, a low power automatic-gain-control system is realized using a novel architecture, thereby rendering the peak detector circuit and loop filter unnecessary. Finally, the complete chip is fabricated. Simulation results suggest receiver sensitivity to be -75 dBm. The transceiver shows an overall power consumption of 3.2 mW when data rate is 5 Mbps, delivering a P1 dBoutput power of -30 dBm.