A 26.9-71.9 GHz current-reuse low noise amplifier with 4.22-5.38 dB NF in 130-nm SiGe

Abstract

This letter presents a 26.9-71.9 GHz low noise amplifier (LNA) using a current-reuse technique for mm-wave applications. The proposed LNA consists of two stages. The first stage uses a feedback structure to extend bandwidth, with series inductors introduced to enhance high-frequency response. The second stage incorporates a series LC network to expand output matching bandwidth. High-pass and low-pass filters are utilized to achieve broadband input matching. Operating at 2.5 V supply voltage, the LNA consumes 15.7 mW, achieving 19.0 dB gain with over 45 GHz bandwidth. The simulated results demonstrate 2.9 dBm OP1dB, 6 dBm IIP3 (FoM = 15.67), and 4.22 dB NF @ 50 GHz. The core area of the layout is 0.29×0.16 mm².