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Low-power-consumption direct-conversion CMOS transceiver for multi-standard 5-GHz wireless LAN systems with channel bandwidths of 5-20 MHz

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13 Author(s)
Tadashi Maeda ; Syst. Devices Res. Labs., NEC Corp., Kanagawa, Japan ; hitoshi Yano ; Hori, S. ; Noriaki Matsuno
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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 -21dBm 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.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 2 )

Date of Publication:

Feb. 2006

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