60-GHz SP4T switch with ESD protection

This paper proposes a new π-network-based single-pole-four-throw (SP4T) switch with inherent ESD protection for 60-GHz applications, which achieves a small core area of 274 μm × 262 μm with a 1.2-V 65-nm bulk CMOS RF process. At 60 GHz, the proposed switch exhibits a simulated performance of 3.4-dB insertion loss, 25.7-dB isolation between Ant 1 and Ant 2/3/4, and 43-dB isolation between Ant 2 and Ant 3/4. At an operating frequency of 60 GHz, the simulated input and output return losses are both around 13 dB; the input P_1dB of the power-handling capability is 11.1 dBm; and the switching speed is around 2.4 ns. RF ESD protection for the SP4T switch has been verified to pass the 2-kV HBM test by simulation.