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Eliminate the Influence of SMPS Ripple Noise for WiFi Receiver with LMS Algorithms
ZHANG Yan,BU Gang,WANG Mingming
Electronic Science and Technology    2019, 32 (1): 11-15.   DOI: 10.16180/j.cnki.issn1007-7820.2019.01.003
Abstract   (413 HTML6 PDF(pc) (1610KB)(36)  

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.


Figure 9. Adaptive filter power analysis results
Extracts from the Article
完成自适应滤波器版图设计并使用PTPX进行功耗分析,结果如图9所示。在33 MHz,1.98 V的工作条件下,本次设计的自适应滤波器功耗约为1.35 mW,可以从WiFi接收机系统总功耗角度来考虑自适应滤波器的意义。线性稳压源电源转换效率约为60%,而开关电源一般可以达到90%以上的转换效率[13],所以当满足如式(1)所示关系时,使用开关电源方案的总功耗得到降低
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