Assuming a triangular shape for the electric field in the base-collector space-charge region of an n-p-n Si BJT enables the electron mean energy to be calculated analytically from a simplified energy-balance equation. On this basis a nonlocal impact-ionization model, suitable for computer-aided circuit simulation, has been obtained and used to calculate the output characteristics at constant emitter-base voltage (grounded base) of advanced devices. Provided the experimental bias-dependent value of the base parasitic resistance is accounted for in the device model, the base-collector voltage at which impact-ionization-induced snap-back occurs can be accurately predicted.
Prediction of Impact-ionization-induced Snap-back In Advanced Si N-p-n Bjts By Means of A Nonlocal Analytical Model For the Avalanche Multiplication Factor
ZANONI, ENRICO
1993
Abstract
Assuming a triangular shape for the electric field in the base-collector space-charge region of an n-p-n Si BJT enables the electron mean energy to be calculated analytically from a simplified energy-balance equation. On this basis a nonlocal impact-ionization model, suitable for computer-aided circuit simulation, has been obtained and used to calculate the output characteristics at constant emitter-base voltage (grounded base) of advanced devices. Provided the experimental bias-dependent value of the base parasitic resistance is accounted for in the device model, the base-collector voltage at which impact-ionization-induced snap-back occurs can be accurately predicted.Pubblicazioni consigliate
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