Novel Two-Tone Intermodulation Phase Measurement for Evaluating Amplifier Memory Effects

The amplitude and phase response of the two-tone intermodulation product, as the tone spacing is swept in frequency, may be used to predict memoryrelated distortion in power amplifiers. Previously, the methods used to measure the phase response were slow and limited to narrow bandwidths. This new measurement method is extremely fast, proposes a method for normalization or calibration of the phase response, and is extremely broadband, making it suitable for measurements of wide band amplifiers such as those used in satellite communication systems.