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A CMOS single-chip transceiver IC is developed for IEEE 802.22 cognitive radio applications. Over the 54 to 862 MHz ultra wideband, the in-band harmonic distortions of the transmitter and the unwanted harmonic mixing of the receiver are effectively suppressed by exploiting the dual-path direct-conversion architecture. A seamless coverage of the full band is achieved by employing a fractional-N PLL...
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