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The proposed MB-OFDM UWB transmitter system, which is implemented in 0.13 mu CMOS technology, consists of a LPF, a VGA, a V-I converter, an up-mixer, and a driver amplifier. Measured results show maximum transmitted output power level of -10 dBm, output P1dB of -7 dBm, and bandwidth of more than 250 MHz and gain flatness of less than 1 dB for all three sub-bands. The implemented transmitter can transmit...
This paper presents a direct-conversion I/Q up-mixer block, which is implemented in 0.18 mum CMOS technology, for the ultra-wideband (UWB) system. To achieve wideband characteristics, a shunt-peaking load is used in the up-mixer. A new wideband amplifier is also proposed, which can suppress unwanted common-mode signals with high linearity. The simulation results show gain flatness of less than 0.5...
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