Patent ID: 8711971

Claim:
A multiple input multiple output (MIMO) transceiver comprising: a baseband radio frequency (RF) chip for conducting RF signals; and an RF transceiver circuit, comprising: a first antenna and a second antenna, the first and second antennas receiving and transmitting the RF signals; a first receiving channel connected between the first antenna and the baseband RF chip; a second receiving channel connected between the second antenna and the baseband RF chip; a first transmitting channel connected between the baseband RF chip and the first antenna, and comprising a first power amplifier and a first transmission line which are connected together in series; a second transmitting channel connected between the baseband RF chip and the second antenna, and comprising a second power amplifier; a first single pole double throw (SPDT) switch, wherein a common terminal of the first SPDT switch is connected to an input of the second power amplifier, a first terminal of the first SPDT switch is connected to an input of the first power amplifier through a second transmission line, and a second terminal of the first SPDT switch is connected to the baseband RF chip; and a second SPDT switch, wherein a common terminal of the second SPDT switch is connected to an output of the second power amplifier, a first terminal of the second SPDT switch is connected to an output of the first power amplifier through a third transmission line, and a second terminal of the second SPDT switch is connected to the second antenna; wherein in response to the common terminal of the first SPDT switch being connected to the first terminal of the first SPDT switch and the common terminal of the second SPDT switch being connected to the first terminal of the second SPDT switch, the first power amplifier, the second power amplifier, the second transmission line, and the third transmission line cooperatively act as a balance power amplifier.