Patent attributes
An SPDT switch in a RF communication transceiver provides for choosing the transmit/receive path for the RF signal. It consists of the series and shunt branches each consisting of stack of FETs. Performance metrics of the RF switch are insertion loss and isolation. At high frequency, the device/FET capacitance and the parasitic capacitances provide a leakage path for the signal, resulting in higher insertion loss and lower isolation. A parallel resonant LC network across each of the series and/or shunt branch FETs in a SPDT switch provides lower insertion loss, higher switch isolation, and lower out of band harmonics when compared to that of the state of the art SPDT switch. A method to reduce the form factor of such switch configuration is disclosed which is useful in wireless front end modules.
