Dual-mode bluetooth/wireless local area network channel-select filter for direct conversion receivers

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Dual-mode bluetooth/wireless local area network channel-select filter for direct conversion receivers

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Published

System level analysis is used to extract various specifications of the channel select filter for integrated dual-mode CMOS bluetooth (BT)/wireless local area network (WLAN; IEEE 802.11b) receivers. A digitally programmable active-RC filter suitable for direct conversion topology is presented. Six-bit R-2R ladders are used to adjust the filter bandwidth with tuning resolution better than 1.56%. Experimental results obtained from 0.35 µm CMOS chips show that using a fourth-order filter satisfies the selectivity requirements of both applications. The filter exhibits spurious free dynamic range of 70.6 and 61.2 dB for BT and WLAN, respectively.

Inspec keywords: CMOS integrated circuits; IEEE standards; wireless LAN; radio receivers; active filters; Bluetooth

Other keywords: direct conversion receiver; wireless local area network receiver; size 0.35 mum; integrated dual-mode CMOS bluetooth; direct conversion topology; dual-mode bluetooth; filter bandwidth; fourth-order filter; tuning resolution; WLAN; active RC filter; system level analysis; wireless local area network channel select filter; IEEE 802.11b

Subjects: CMOS integrated circuits; Local area networks; Radio links and equipment; Computer communications; Active filters and other active networks

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