Method and apparatus for testing a millimeter wave radio

A radio transceiver comprises:

• a transmit path, wherein the transmit path includes one or more power amplifiers;
• a receive path, wherein the receive path includes one or more low noise amplifiers;
• an inverter, wherein the inverter is adapted to select between a plurality of transmit and receive modes for the radio transceiver;
• a balun having a secondary winding, wherein the secondary winding is coupled to the transmit path at a transmit power amplifier output and wherein the secondary winding includes a center tap coupled to the inverter, wherein the inverter is adapted to select between the plurality of transmit and receive modes for the radio transceiver by modifying a bias of the balun at the center tap, wherein the plurality of transmit and receive modes includes a mode wherein the one or more power amplifiers is partially activated.