An Ultra-Low-Supply Dual-Band VCO for Wireless Sensor Networks
Aggressive scaling down reduces the supply voltage of digital integrated circuits continuously. In order to realize Systems-On-a-Chip (SOC), analog and RF circuits should also work under the reduced voltage. For Wireless Sensor Networks (WSN), low supply is important for communication nodes as the supply voltage must be low enough under a single solar cell as power source. Besides, the future transceiver system for WSN must be able to adapt itself to various applications and environments, so multi-mode is the trend. In multi-mode systems, it would be ideal to use a signal oscillator which can generate multiple frequencies. Therefore, a Ultra-low-supply Dual-band Voltage-Controlled Oscillator (UDVCO) is proposed here. The presented UDVCO can be dynamically switched between two bands near 2.4-GHz and the 5-GHz. Its minimal operating voltage is 0.5 V by connecting the substrate of the cross-coupled NMOSFETs to the supply. A mathematical model is built for the low-supply VCOs, whose accuracy is validated by SpectreRF simulation. A series of LC tank is used as a noise filter for both the two bands. The chip is fabricated in the 0.18- 1m CMOS HJTC technology. Our measurement results show that the low-frequency band can be tuned from 2.01 GHz to 2.08 GHz and the phase noise is about -82.17 dBc/Hz@1MHz; while the high-frequency band ranging from 3.24 GHz to 3.44 GHz and the phase noise is about -74.33 dBc/Hz@1MHz.
Bo Zhao Yongpan Liu Pengpeng Chen Tao Chen Huazhong Yang Hui Wang
Electronic Engineering Dept, TNList, Tsinghua University, Beijing, China, 100084 Faculty of Electronic Engineering, TNList, Tsinghua University, Beijing, China, 100084
国际会议
2009国际通信电路与系统学术会议(ICCCAS 2009)(2009 International Conference on Communications，Circuits and Systems)
成都
英文
797-801
2009-07-23（万方平台首次上网日期，不代表论文的发表时间）