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We have developed a compact dual-band (2.45 GHz) power-amplifier module with a concurrent 8OZ.llaWg) WLANs. The proposed diplexer-matching network is three-dimensionally implemented i n an LTCC of 20 dBm at 2. 4 GH& and 1s dgm at 5 2 5 G H~ with an E V M 0144% for a 54-Mbps OFDM signal. Our approach of using a concurrent dual-band PA reduces the size and cost by D * almost half compared with using a conventional parallelIn this paper, we present a compact dual-band PA module with a single amplifier chain for IEEE802.1 laiblg output-networks are three-dimensionally integrated in a substrate, which enables us to reduce the module size to 5x 5 x 1.4 mm. The PA module exhibits sufficient output power, compliant with a strict error vector magnitude (EVM) specification, for both the 2.4-and 5-GHz bands, . JdaP/GaAs HBT lor triPle-mde (*EEE WLAN systems, The proposed diplexer input-and subtrate (5 5 , , ,The ,,,duie exhibib an output power multi-layer low temperature co-fired ceramic (LTCC) 1 m.without requiring any external components or band-selecting switch, hder Terms -Diplerer, dual-band, impedance matching, LTCC. power amplifiers. wireless LANs. CIRCUIT DESIGN

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This paper describes a low-power-consumption direct-conversion CMOS transceiver for WLAN systems operating at 4.9-5.95 GHz. Its power consumption is reduced by using a resonator-switching wide-dynamic-range LNA. The broad tuning range needed for multiple-channel-bandwidth systems is provided by a single widely tunable low-pass filter based on negative-source-degeneration-resistor transconductors, and its automatic frequency-band-selection PLL supports multiple standard 5-GHz WLAN systems. The system noise figure is 4.4 dB at a maximum gain of 74 dB, and the receiver IIP3 is +5 dBm and 21 dBm for the minimum and maximum gain modes, respectively. The error vector magnitude (EVM) of the transmitted signal is 2.6%. The current consumption is extremely low, 65 mA in the transmitter path and 60 mA in the receiver path.Index Terms-CMOS transceiver, frequency synthesizer, HiperLAN/2, HiSWANa, IEEE 802.11a, low-noise amplifier (LNA), low-pass filter (LPF), orthogonal frequency division multiplexing (OFDM), wireless LAN (WLAN).