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Experimentally Proven Equation for the Collector-Depletion-Layer Transit Time of npn Bipolar Transistors

The dependence of the collector-depletion-layer transit time of npn bipolar transistors, τ C, on the effective depletion-layer width, W C, was found to be well fitted by τ C=W C/v s, where v s is the electron saturation velocity, while it was not fitted by the well-known equation τ C=W C/2v s, indicating that the effect of inductive current is negligible.