Method for adjusting power amplifier impedance

A method of adjusting an impedance of a power amplifier of a radio frequency system for matching with an antenna switch die, the method comprising:

• connecting the power amplifier to the antenna switch die via an impedance adjustment circuit, the impedance adjustment circuit including an input node configured to receive the radio frequency signal from the power amplifier, an output node configured to provide the radio frequency signal to an antenna switch die, a plurality of electrical components arranged between the input node and the output node, and at least one switch configured to selectively electrically connect at least one of the electrical components to the input node and the output node;
• determining an Error Vector Magnitude of the radio frequency system for each of a plurality of states of the at least one switch;
• and
• controlling the at least one switch to enter the state of the plurality of states that minimizes the Error Vector Magnitude of the radio frequency system.