RECENTLY, the interest in ultra-wideband (UWB) system for wireless personal area network (WPAN) application has increased significantly, though the international standard has yet to be finalized. The allocated frequency band of the UWB system is – GHz (low-frequency band: –5 GHz; highfrequency band: 6– GHz). Two recent major proposals [1], [2] for the IEEE propose that data rates of up to 400–480 Mb/s can be obtained. | 544 IEEE JOURNAL OF SOLID-STATE CIRCUITS VOL. 40 NO. 2 FEBRUARY 2005 An Ultra-Wideband CMOS Low Noise Amplifier for 3-5-GHz UWB System Chang-Wan Kim Min-Suk Kang Phan Tuan Anh Hoon-Tae Kim and Sang-Gug Lee Abstract An ultra-wideband UWB CMOS low noise amplifier LNA topology that combines a narrowband LNA with a resistive shunt-feedback is proposed. The resistive shunt-feedback provides wideband input matching with small noise figure NF degradation by reducing the g-factor of the narrowband LNA input and flattens the passband gain. The proposed UWB amplifier is implemented in cMoS technology for a UWB system. Measurements show a 3-dB gain bandwidth of GHz a minimum NF of dB a power gain of dB better than 9 dB of input matching and an input IP3 of 7 dBm while consuming only mW of power. Index Terms Broadband CMOS feedback low noise amplifier RF ultra-wideband. I. Introduction Recently the interest in ultra-wideband UWB system for wireless personal area network WPAN application has increased significantly though the international standard has yet to be finalized. The allocated frequency band of the UWB system is GHz low-frequency band GHz high-frequency band GHz . Two recent major proposals 1 2 for the IEEE propose that data rates of up to 400-480 Mb s can be obtained using only the low-frequency band. The low-frequency band has been allocated for the development of the first-generation UWB system. CMOS technology is a satisfactory choice for the implementation of the low band UWB system when considering the time to market hardware cost the degree of difficulty etc. Until now reported CMOS-based wideband amplifiers tend to be dominated by two different topologies the distributed and resistive shunt-feedback amplifiers. The distributed amplifiers 3 4 normally provide wide bandwidth characteristics but tend to consume large dc current due to the distribution of multiple amplifying stages which makes .
