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ABSTRACT: This paper describes a high-performance WLAN 802.11a/b/g radio transceiver, optimized for low-power in mobile applications, and for co-existence with cellular and Bluetooth systems in the same terminal. The direct-conversion transceiver architecture is optimized in each mode for low-power operation without compromising the challenging RF performance targets. A key transceiver require-ment is a sensitivity of 77 dBm (at the LNA input) in 54 Mb/s OFDM mode while in the presence of a GSM1900 transmitter interferer. The receiver chain achieves an overall noise figure of 2.8/3.2 dB, consuming 168/185 mW at 2.8 V for the 2.4/5 GHz bands, respectively. Signal loopback and transmit power de-tection techniques are used in conjunction with the baseband modem processor to calibrate the transmitter LO leakage and the transceiver I/Q imbalances. Fabricated in a 70 GHz f T 0.25-m SiGe BiCMOS technology for system-in-package (SiP) use, the dual-band, tri-mode transceiver occupies only 4.6 mm 2 . Index Terms—BiCMOS integrated circuits, Bluetooth, cal-ibration, cellular radio, frequency synthesis, IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, interference, OFDM, RF trans-ceiver, wireless LAN.
IEEE Journal of Solid-State Circuits 41. · 3.06 Impact Factor