Abstract

This paper presents design guidelines for ultra-low power Low Noise Amplifier (LNA) design by comparing input matching, gain, and noise figure (NF) characteristics of common-source (CS) and common-gate (CG) topologies. A current-reused ultra-low power 2.2 GHz CG LNA is proposed and implemented based on 0.18 um CMOS technology. Measurement results show 13.9 dB power gain, 5.14 dB NF, and −9.3 dBm IIP3, respectively, while dissipating 140 uA from a 1.5 V supply, which shows best figure of merit (FOM) among all published ultra-low power LNAs.

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