EVM (Error Vector Magnitude) is the key metric used to evaluate transmitter performance. EVM provides a concise “one number” summary to characterize the transmitter quality.
EVM is used during the design phase to characterize devices and uncover underlying sources of distortions. Because of its simplicity, it is also used in manufacturing to guarantee that transmitters will operate properly in real-world environments. This application note provides the necessary background to understanding why and how EVM is measured.
