Design of 60GHz broadband LNA for 5G cellular using 65nm CMOS technology

In this paper, 60GHz millimeter wave (mmWave) two stage common source (CS) cascode low noise amplifier (LNA) with degenerative inductor is designed in 65nm CMOS technology. It has a wide band (57-64GHz) and highly stable characteristics. We have also proposed two different techniques to design the LNA unconditionally stable and increase its linearity without degrading other performancemetrics. Simulation results of a two stage LNA without the stability improvisation show a peak gain of 24.5dB at 61GHz, input return loss of -9.1dB, noise factor (NF) of 1.5dB, static power dissipation Pdc of 6.63mW and is conditionally stable. In one of the methods of designing LNA unconditionally stable is to reduce the gain to 19.5dB by incorporating an additional inductor at the source of second stage amplifier. Linearity is also increased to P1dB of -2.44dBm without degradation of other parameters. Another approach is to maintain the peak gain greater than 22dB by increasing the transconductance of the CMOS transistors. This increases the return loss to -14.5dB. Various obtained results are presented and discussed.