Analytical Electro-Thermal Model for Multianode Schottky Diodes With Improved Temperature-Dependent Parameters Extraction Method

An analytical electro-thermal model for multianode Schottky diodes is proposed in this work. By characterizing the self-heating effects, the temperature-dependent parameters including series resistance, ideality factor, and saturation current could be accurately extracted. By means of self-consistent mapping between thermal and electrical domain, the proposed model could eliminate the errors in conventional method, which makes the assumption that each anode operates at the same temperature even at high-junction current levels. This approach is capable of determining highly accurate real-time parameters for diode under different dissipated powers, which is critical for circuit reliability analysis and high-power multiplier design. The proposed electro-thermal model has been applied to analyze a novel four-port balanced tripler, operating up to 220 GHz, with the comparison to two conventional models. With an input power of 350 mW, the circuit efficiency simulated based on this extraction method only features a difference of ~1.1% at 219-GHz measured results.