Wide band pulse matched LNA for low power architecture

Abstract

New architectures, dedicated to UWB low data rate systems, such as for instance, peak detection or energy detection focus on power saving. In this context, a LNA with ideal flat gain response over the whole bandwidth [3 GHz-5 GHz] is no more mandatory. This paper proposes a new approach, which relies on a matched amplification to the input pulse. This technique enables to increase gain up to 7.7 dB for a given consumption. A simulated CMOS design based on common source amplifier with inductive degeneration is presented for illustration. Energetic gain is close to 15 dB with a minimum noise figure of 2.3 dB and an input IP1 of 11.4 dBm. Core of the LNA dissipates less than 2.6 mW.