Electronic Science and Technology ›› 2019, Vol. 32 ›› Issue (1): 11-15.doi: 10.16180/j.cnki.issn1007-7820.2019.01.003

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Eliminate the Influence of SMPS Ripple Noise for WiFi Receiver with LMS Algorithms

ZHANG Yan,BU Gang,WANG Mingming   

  1. School of Electronic and Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China
  • Received:2018-01-10 Online:2019-01-15 Published:2018-12-29
  • Supported by:
    Natural Science Foundation of Jiangsu Province(BK2012792)

Abstract: Aim

ing at the problem of ripple when the switching mode power supply was applied to the RF front-end analog circuit, a scheme of eliminating ripple in the digital baseband by using adaptive filtering was proposed. WiFi transceiver system based on IEEE802.11b wireless communication protocol was established by using simulink, and LMS adaptive filter was utilized in digital baseband to suppress the ripple. Simulation results showed that the signal quality could be significantly improved by the adaptive filter. When the ripple amplitude was within 150 mV, the received signal could meet the protocol requirements. Based on these results, an adaptive filter was designed, including both front end and layout. The power consumption analysis showed that the final adaptive filter consumed only 1.35 mW at 33 MHz clock frequency and 1.98 V supply voltage, validating the possibility of using switching mode power supplies for WIFI receivers to achieve significant power savings.

Key words: switching mode power supply, WiFi receiver, adaptive filter, LMS algorithms, low power, wireless communication

CLC Number: 

  • TN492