Design and performance analysis of single biasing based SPDT switch for wireless data communications

In this paper, a single biasing configuration for three different topologies of SPDT switch are designed in order to study the circuit performances based on insertion loss, return loss and isolation. In addition, current consumption of the three different topologies is discussed in this paper. The circuit topologies are series, shunt-shunt-shunt and series-shunt-shunt configuration. The targeted application is for wireless data communication such as WiFi, WiMAX and LTE. Design and analysis have been performed in a simulation software where a commercialize PIN diode model has been taken into account. As a result, single biasing based series-shunt-shunt topology gives the best option for SPDT switch design if looking at high isolation performance and good return loss with minimum current consumption.