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A dual-band RF transceiver for multistandard WLAN applications

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9 Author(s)
Chang, S.-F.R. ; Dept. of Electr. Eng., Nat. Chung Cheng Univ., Taiwan ; Wen-Lin Chen ; Shuen-Chien Chang ; Chi-Kang Tu
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A new dual-band RF transceiver is presented for 2.4- and 5.2-GHz multistandard wireless local area networks. The proposed dual-band RF transceiver integrates a concurrent dual-band front-end, a triple-band frequency synthesizer, and a band-sharing in-phase/quadrature modulator/demodulator to maximize component and power reuse. The design is started with the examination of an enhanced dual-band heterodyne architecture and then the optimal circuit partition to satisfy the multistandard requirements. Key dual-band circuits are designed and integrated with other building blocks for experimental demonstration. The measurement shows that eight 5-GHz channels and 13 2.4-GHz channels can be synthesized within 130 μs with phase noise less than -98 dBc/Hz at 100-kHz off carrier and spur suppression greater than -65 dBc. The transmitted P1 dB power is 25/20 dBm at 2.4/5.2 GHz, respectively, with the modulation accuracy error-vector magnitude (EVM) values varying from 3.57% to 7.19%. The receiver gain is 20/31 dB at 2.4/5.2 GHz front-end and 70 dB at IF back-end with EVM within 2.32% to 10% from -70- to -17-dBm received power range.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:53 ,  Issue: 3 )

Date of Publication:

March 2005

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