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Electro-Thermal Theory of Intermodulation Distortion in Lossy Microwave Components

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4 Author(s)
Wilkerson, J.R. ; Dept. of Electr. & Comput. Eng., North Carolina State Univ., Raleigh, NC ; Gard, K.G. ; Schuchinsky, A.G. ; Steer, M.B.

An analytic formulation of dynamic electro-thermally induced nonlinearity is developed for a general resistive element, yielding a self-heating circuit model based on a fractional derivative. The model explains the 10 dB/decade slope of the intermodulation products observed in two-tone testing. Two-tone testing at 400 MHz of attenuators, microwave chip terminations, and coaxial terminations is reported with tone spacing ranging from 1 to 100 Hz.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:56 ,  Issue: 12 )