The base current and the current gain as functions of the collector current for an AlGaAs HBT and an InGaP HBT at high currents. The emitter size of the transistors is .
Calculated MTTF as a function of inverse temperature at different stress currents. The activation energy calculated from the curve with a stress current density of is also shown in the figure. It is a function of the stress temperature.
Calculated MTTF as a function of the stress current at different temperatures. This figure shows that the factor, as seen from the slope of the curves, can change as the temperature changes.
Arrhenius plot of MTTF vs . Dots are experimental data, lines are fitted curves using our model. The current densities used are 5.2, 11, and .
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