A novel measurement based method enabling rapid extraction of a RF Waveform Look-Up table based behavioral model

Abstract

A solution allowing for the rapid, cost effective and accurate extraction of nonlinear Direct Waveform Look-Up table (DWLU) based behavioral models is presented in this paper. The behavioral model extracted is a reformulation of the PHD model, now defined about a non 50-Ohm reference impedance, enabling it to accurately predict load-pull contours. The technique exploits a simple active and passive load-pull architecture enabling a numerical integration solution for model coefficient extraction that necessitates only varying the phase of the input stimulus during measurement. This solution dramatically speeds up the behavioral model coefficient extraction process, enabling ‘real time’ access to critical device behavior. It ensures that only a minimum, optimized set of load-pull measurements are performed. The technique is demonstrated on a Mimix Broadband Gas 8×2×30um 0.5W HBT.