Design of Low Voltage Low Power LPF for WSN Node

Abstract:

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 corner, aging and temperature deviation is adjusted by an automatic frequency tuning circuit. The filter in a 0.18μm RF CMOS technology consumes 1mW from a 1V 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.

• Periodical: Advanced Materials Research (Volumes 760-762)
• Pages: 54-59
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.760-762.54
• Online since: September 2013
• Authors: Yang Lin, Zhi Qun Li, Chen Jian Wu, Meng Zhang, Zeng Qi Wang
• Keywords: Automatic Frequency Tuning, Low-Pass Continuous-Time Filter, Low-Power, Wireless Sensor Network (WSN)

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