Circuit Design to Reduce 3rd Order Intermodulation Distortion in FET Amplifiers

Using a large-signal computer model for the MESFET with a modified harmonic balance technique the third-order intermodulation response of general amplifier circuits is found. The effect of device, bias, and impedance changes is investigated and compared with experimental results for a single-stage feedback amplifier. The method is useful for the design of microwave linearizes. A novel scheme for the reduction of intermodulation distortion in power amplifiers operating near compression is presented with experimental data.