A 5GHz to 6GHz integrated differential LNA

Abstract

This paper presents the design and post-layout simulation results of an integrated differential LNA in a 0.18 mum CMOS process, which operates in the frequency bands of 5 GHz to 6 GHz. It utilizes two cascode stage amplifiers, cascaded with a phase splitter to achieve a differential signal. From a 1.5 V supply, the circuit exhibits a gain flatness of 13 dB with less than 0.08 dB variations within its 1 GHz bandwidth. The LNA has a 50Omega NF of 2.9 dB to 3.6 dB between 5 GHz and 6 GHz. The gain and phase differences between its two outputs are only 0.04 dB and 1800 plusmn 0.30 respectively