Meysam Azimi-Roein, Abbas Golmakani, Design of 3.1-10.6 GHz Ultra-Wideband Cmos Low Noise Amplifier for Wireless Applications, Research Journal of Applied Sciences, Volume 11,Issue 7, 2016, Pages 463-468, ISSN 1815-932x, rjasci.2016.463.468, (https://makhillpublications.co/view-article.php?doi=rjasci.2016.463.468) Abstract: Two ultra wideband Low Noise Amplifiers (LNAs) are presented. A common source topology is adopted for input stage to achieve wideband input matching while a cascode stage is used as the second stage to provide power gain at high frequencies. The first work is a LNA with resistive shunt feedback. It achieves a maximum power gain of 10.5 dB, a bandwidth of 10 GHz and 8.7 dB minimum noise fiqure. The power consumption is 14.28 mW from a 1.8 V supply. The second work is common source with a reuse pmos current source. Keywords: CMOS;feedback;gain flaness;low noise amplifier;Ultra Wide Band (UWB)