A 0.18μm CMOS T/R switch for 900MHz wireless application

A single-pole double-throw (SPDT) transmit/receive (T/R) switch for 900 MHz applications has been designed in a 0.18 mum CMOS process. The switch exhibit a 16 dB input 1-dB compression point with output 1-dB compression point of 12.9 dB. At 900 MHz of frequency operation, the switch has excellent characteristics whereby the insertion loss is only around 3 dB and isolation around 40 dB for both transmitting and receiving operations. The proposed switch achieves return loss of -11 dB during these operations with switching response time around 4.5 ns.