A 2.4-GHz Resistive Feedback LNA in 0.13- $\mu$ m CMOS

A g_m-boosted resistive feedback low-noise amplifier (LNA) using a series inductor matching network and its application to a 2.4 GHz LNA is presented. While keeping the advantage of easy and reliable input matching of a resistive feedback topology, it takes an extra advantage of g_m-boosting as in inductively degenerated topology. The gain of the LNA increases by the Q-factor of the series RLC input network, and its noise figure (NF) is reduced by a similar factor. By exploiting the g_m-boosting property, the proposed fully integrated LNA achieves a noise figure of 2.0 dB, S21 of 24 dB, and IIP3 of - 11 dBm while consuming 2.6 mW from a 1.2 V supply, and occupies 0.6 mm² in 0.13-mum CMOS, which provides the best figure of merit. This paper also includes an LNA of the same topology with an external input matching network which has an NF of 1.2 dB.