| 摘要 |
A switching circuit disclosed herein comprises: a transmission port; a first internal connection switching circuit which is connected between the transmission port and an antenna port and includes a depletion mode first transistor and a depletion mode second transistor, the first internal connection switching circuit constituting a parallel resonant circuit and a series resonant circuit; a reception port; a second internal connection switching circuit which is connected between the reception port and the antenna port and includes a depletion mode third transistor and a depletion mode fourth transistor, the second internal connection switching circuit constituting a parallel resonant circuit and a series resonant circuit; a standby port; a third internal connection switching circuit which is connected between the standby port and the antenna port and includes a depletion mode fifth transistor, the third internal connection switching circuit connecting the standby port to the antenna port and separating the standby port from the antenna port; and a control terminal.
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