Abstract
Collector-emitter breakdown in npn HBTs is modeled using a base-collector current equal to I h = α i I c, where I c is the collector current and α i is the integral of the electron impact ionization coefficients over the base-collector depletion depth. We fit the α integrals for collector doping concentrations N d ∼ 0.08 to 1 × 10 17 cm −3 to functions of the collector voltage. The model is suitable for SPICE and harmonic balance simulators, is temperature dependent, and allows voltages to be swept above the collector-emitter breakdown limit without catastrophic effects to the model convergence.
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