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Design and Analysis of Dual Band I/Q Modulator For Wireless LAN  

Park, Hyun-Woo (Dept. of Electronics Engineering, University of Incheon)
Koo, Kyung-Heon (Dept. of Electronics Engineering, University of Incheon)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.3, 2008 , pp. 1-6 More about this Journal
Abstract
A dual band I/Q modulator which converts baseband input signals to 2.4GHz or 5GHz RF output has been proposed. The dual band I/Q modulator for 2.4GHz and 5GHz wireless LAN applications consists of $90^{\circ}$ phase shifter and wideband mixer. The I/Q modulator showed 15dB conversion loss at 2.4GHz and 16dB conversion loss at 5GHz. The sideband suppression is about 15dBc at 2.4GHz and 16dBc at 5GHz. Measured data shows 8.5% EVM at 2.4GHz, and 10% EVM at 5GHz for QPSK with symbol rate of 11Mbps. A carrier rejection is about 40dBc at 2.4GHz/5GHz band, and the I/Q modulator satisfied the output wireless LAN spectrum mask with baseband input signal.
Keywords
WLAN; Mixer; I/Q Modulator;
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