Patent ID: 9705492
Date: 2017-07-11
CPC Classifications: H03K

Claim:
1. An SPDT circuit comprising: an antenna; a first MOS transistor group transmitting a transmission signal from a transmitting end to the antenna according to a turn-on operation thereof and blocking introduction of a reception signal received in the antenna into the transmitting end according to a turn-off operation thereof; a first gate resistor group including gate resistors each connected to gates of the respective transistors of the first MOS transistor group; a second MOS transistor group applied with gate power complementary to turn-on gate power of the first MOS transistor group to operate complementarily to the first MOS transistor group, transferring the reception signal to a receiving end, and blocking leakage of the transmission signal to the receiving end; a second gate resistor group including gate resistors each connected to gates of the respective transistors of the second MOS transistor group; and a variable gate resistor circuit group increasing resistance values of the respective gate resistors when each of the first and second MOS transistor groups is changed from a turn-off state to a turn-on state.