Patent ID: 8451044
Filing Date: 2013-05-28
Classification: H03K,H04B

Abstract:
1. A microwave switch circuit comprising: a switching circuit including at least one switching FET and configured to conduct a radio frequency (RF) signal between an input port and an output port in a first mode of operation; a shunting circuit including at least one shunt FET and configured to shunt the RF signal to ground in a second mode of operation; and a controller including a control port configured to receive a switch control signal, an upper voltage supply rail configured to supply a first supply voltage to the controller, and a plurality of control switches configured to drive a gate of the at least one shunt FET to turn on the at least one shunt FET in the second mode and to turn off the at least one shunt FET in the first mode, to drive a gate of the at least one switching FET to turn off the at least one switching FET in the second mode and to turn on the at least one switching FET in the first mode, and to bias one of a source and a drain of the at least one switching FET to increase a voltage difference between the gate and the drain of the at least one switching FET in the first mode, and to bias a drain of the at least one shunt FET to increase a voltage difference between the gate and the drain of the at least one shunt FET in the second mode.