Multitone phase and amplitude measurement for nonlinear device characterization

This paper presents a new setup for nonlinear device characterization. The presented measuring bench allows the characterization of phase and amplitude of correlated and uncorrelated multitone signals. The method presents a simple hardware implementation using only an ordinary scope as the main device. The validity of the technique is confirmed by an experimental test using a two-tone uncorrelated input signal. The experimental values agree with the theoretical results assuring the validity of the proposed technique. Moreover, they confirm the fact that despite the lower and upper intermodulation distortion can have the same amplitude; they could present different relative phases.