Abstract: A transmitter for wireless communications can remove a signal having an image frequency without using a band pass filter, and can be downsized such that it is integrated into a single chip on an integrated circuit board.

Abstract: A transmitter for wireless communications can remove a signal having an image frequency without using a band pass filter, and can be downsized such that it is integrated into a single chip on an integrated circuit board.

Abstract: A transceiver switch of a radio frequency transceiver is provided with a first diode and a second diode included in an electrostatic discharge circuit, which are connected in parallel along different directions to ground a positive (+) current or a negative (?) current generated from electrostatic charges. Another transceiver switch of a radio frequency transceiver is also provided with a resistor connected between a node connecting to an electrostatic discharge circuit and a ground terminal, to make the voltage of the node connecting to the electrostatic discharge circuit become a fixed DC potential connecting to the ground terminal.