Design of Low Voltage Low Power LPF for WSN Node
A fourth-order low-pass continuous-time filter for a WSN transmitter is presented.The active RC filter was chosen for the high linearity,designed by using the leapfrog topology imitates the passive filter.The operation amplifier (op-amp) adopted by the filter is feed-forward operation amplifier,which could get the GBW as large as possible under the low power consumption.The cut-off frequency deviation due to the process comer,aging and temperature deviation is adjusted by an automatic frequency tuning circuit.The filter in a 0.18μm RF CMOS technology consumes 1 mW from a Ⅳ power supply.The measured results of the chip show that the bandwidth is about 1.5MHz.The voltage gain of filter is about-4.5dB with the buffer,the ripple in the pass-band is lower than 0.5 dB,and the channel rejection ratio is larger than 30dB at 4MHz.
Low-pass Continuous-time Filter Low-power Automatic Frequency Tuning WSN
Yang Lin Zhiqun Li Chenjian Wu Meng Zhang Zengqi Wang
Institute of RF-&OE-ICs,Southeast University,Nanjing,China,210096;School of Integrated Circuit,South Institute of RF-&OE-ICs,Southeast University,Nanjing,China,210096;Key Laboratory of Jiangsu Province
国际会议
郑州
英文
257-261
2013-10-19（万方平台首次上网日期，不代表论文的发表时间）