Method for switching a power amplifier
A power amplifier switching circuit includes a transmission filter. A first switch having an input connects to the transmission filter. A second switch connects to a first output of the first switch. A receive portion of a duplexer connects to an output of the second switch. A power amplifier receives a second output of the first switch and an output matching network. A transmit portion of duplexer interposes the output matching network and and an input of a third switch. A phase shifter interposes an antenna output and an input of a second switch.
1 . A device comprising:
a transmission filter;
a first switch having an input connected to the transmission filter;
a second switch connected to a first output of the first switch;
a receive portion of a duplexer connected to an output of the second switch;
a power amplifier receiving a second output of the first switch and an output matching network;
a transmit portion of duplexer interposing the output matching network and and an input of a third switch; and
a phase shifter interposes an antenna output and an input of a second switch.
2 . A device, as defined in claim 1 , further including a serially connected second phase shifter and third switch that interposes the second output of the first switch and the input of the second switch.
3 . A device, as defined in claim 1 , further including a low power amplifier interposing the second output of the first switch and the input of the second switch.
4 . A device, as defined in claim 1 , wherein:
the first switch is a high isolation switch; and
the second switch is a low isolation switch.
5 . A device, as defined in claim 1 , wherein the first and second switches are separated by at least 10 dB.
6 . A device, as defined in claim 5 , further including a serially connected second phase shifter and third switch that interposes the second output of the first switch and the input of the second switch.
7 . A device, as defined in claim 5 , further including a low power amplifier interposing the second output of the first switch and the input of the second switch.