A SPDT switch in a standard 45 nm CMOS process for 94 GHz Applications

A fully integrated single-pole double-throw (SPDT) transmit/receive switch (T/R switch) is implemented on a standard 45nm CMOS process. This circuit is dedicated to fully integrated CMOS RF front end modules operating at 94 GHz. The traveling-wave topology was used to minimize the insertion loss at millimeter wave frequencies. The switch exhibits a measured insertion loss of 5.3 dB, an isolation of 20.5 dB, and a return loss at Tx/Rx port of -12 dB at 94 GHz. An input 1dB compression point higher than 11 dBm is measured at 60 GHz and 15 dBm at 94 GHz after simulation. Excellent agreement between measurement and simulation results is observed.