Patent ID: 8706434

Claim:
A computer-implemented method for measuring nonlinear electronic systems, comprising the steps of: (a) applying a combination of pure sinusoidal signals at frequencies f 1 =ω 1 /2π and f 2 =ω 2 /2π to an input of an electronic unit under test (UUT), the UUT having an output; (b) for a discrete number of sequential input power steps, measuring and recording separately the amplitude of the f 1 =ω 1 /2π input signal as I1, the amplitude of the f 2 =ω 2 /2π input signal as I2, the amplitude of an f 1 -f 2 second-order intermodulation component signal as IMD2 at the UUT output, and the amplitude of a 2f 1 -f 2 third-order intermodulation component signal as IMD3 at the UUT output; (c) curve fitting the I1 and IMD2 signals using least squares fitting; (d) curve fitting the I2 and IMD3 signals using least squares fitting; and (e) calibrating power losses in all signal paths to correct for the applied and measured signals.