A digitally assisted baseband filter with 9MHz bandwidth and 0.3 dB IQ mismatch for a WLAN receiver chain

Yogesh Darwhekar,Rakesh Kumar,Debapriya Sahu,Shanthi Pavan,Ashish Lachhwani,T. Krishnaswamy,Subhashish Mukherjee

2009 IEEE International Symposium on Circuits and Systems (ISCAS)（2009）

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摘要

We describe the design of a fifth order opamp-RC filter in a 65nm digital CMOS process. Designed for a WLAN receiver chain, the baseband filter has a bandwidth of 9MHz and features extensive use of digital hardware to correct for analog imperfections and thereby relaxing area and power requirements. Measurements show a 24 dB adjacent channel attenuation and an out-of-band IIP3 of 33 dBm. The complete filter consumes 9.5mA from a 1.3V supply and occupies an area of 0.46mm ² .

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关键词

digitally assisted baseband filter,IQ mismatch,WLAN receiver chain,fifth order opamp-RC filter design,digital CMOS process,analog imperfection,adjacent channel attenuation,out-of-band IIP3,bandwidth 9 MHz,size 65 nm,current 9.5 mA,voltage 1.3 V

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