A 1V CMOS LNA for low power ultra-wideband systems

Abstract

This paper presents a broadband LNA for low power, low data-rate ultra-wideband systems in the frequency band of 100-960 MHz. The LNA is based on a common-gate structure with active shunt-feedback to provide a broadband 50 Omega input match and a low noise figure with minimal bias current. The simulated power gain of the LNA is 10.5 dB with a 3-dB bandwidth of 1.66 GHz. The noise figure across the entire band is between 5.5 and 6 dB with an average value of 5.6 dB. The IIP3 ranges from -3.5 to -5.5 dBm, with an average value of -4.4 dBm. The circuit is designed using a standard 90 nm CMOS process, and draws only 425 muA from a 1 V supply.