A miniature low-insertion-loss, high-power CMOS SPDT switch using floating-body technique for 2.4- and 5.8-GHz applications

A low insertion loss SPDT switch in a standard 0.18-μm CMOS process was developed for 2.4- and 5.8-GHz WLAN applications. In order to reduce the insertion loss and increase the P_1dB, the floating-body circuit topology is proposed. The series-shunt switch achieves a measured P_1dB of 20 dBm, an insertion loss of 1.1 dB, and an isolation of 27 dB at 5.8 GHz. It also achieves a measured insertion loss of 0.65 dB and an isolation of 35 dB at 2.4 GHz. The effective chip size is only 0.03 mm². The measured data agree well with the simulation results. This work presents low insertion loss, high isolation and good power performance with the smallest chip size compared to previously reported 2.4- and 5.8-GHz CMOS switches.