Patent ID: 6904271

Claim:
A high-frequency-signal switching circuit comprising: a first high-frequency-signal path including: a high-frequency amplifier stage; a first diode connected in series between a high-frequency-signal input end and an input end of the high-frequency amplifier stage; and a second diode connected in series between a high-frequency-signal output end and an output end of the high-frequency amplifier stage; a second high-frequency-signal path including a third diode connected in series between the high-frequency-signal input end and the high-frequency-signal output end; and a switching-voltage supply section to switch the high-frequency amplifier stage between an operation state and an non-operation state, and to switch the first, second and third diodes between an ON state and an OFF state, wherein, when a switching voltage of the switching-voltage supply section has a first value, the high-frequency amplifier stage is in the operation state, the first and second diodes are in the ON state, and the third diode is in the OFF state, so that a high-frequency signal is transferred through the first high-frequency-signal path, and when the switching voltage of the switching-voltage supply section has a second value, the high-frequency amplifier stage is in the non-operation state, the first and second diodes are in the OFF state, and the third diode is in the ON state, so that a high-frequency signal is transferred through the second high-frequency-signal path.