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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...
This paper presents RF prototype system for DS-CDMA ultra wide-band (UWB) communication. The Federal Communication (FCC) authorized the commercial use of the UWB technology in February 2002. Where, the frequency range of the spectrum mask in an indoor environment is from 3.1 GHz to 10.6 GHz. But because of 5 GHz wireless LAN, they usually use frequency band from 3.1-4.9 GHz. This prototype RF system...
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