28 GHz Front –End with Duplexer in 40 nm CMOS Technology for 5G Beam-steering Transceivers

This paper presents a (transceiver) TRX front-end structure design for Phased Array applications in 40nm CMOS Bulk process. The proposed structure consists of the Power Amplifier (PA) the Low Noise Amplifier (LNA) along with a monolithic transformer duplexer for Antenna connection applied in half-duplex systems. The front end covers the millimeter wave (MMW) 5G band. The PA design contains two differential cascode stages with capacitor neutralization technique achieving a small signal gain (S
21
) of 22.86dB with a -3dB bandwidth (BW) at 22-34 GHz. Moreover, the PA reaches a PAE
max
of 31.66% and a P
sat
of 18.5 dBm. The LNA design consist of two cascode stages using current reuse technique at the first stage, obtaining 17.5 dB gain (S
21
) with a -3 dB bandwidth from 22.5 to 31 GHz. Both amplifiers are connected to the antenna through a compact duplexer with minimum losses and sufficient isolation.