B.8. SPICE BJT βDC as a Function of Collector Current
SPICE calculates a dc beta, βDC, when ISE and NE are included in the transistor model. The equation for the calculation uses βDC = IC/IB, where IB (forward-active mode) includes the ideal and leakage terms, (B.12),
and IC is the collector current for the forward-active mode, (B.7),
Using (B.7) and (B.12) in the definition of βDC, we obtain
Equation B.36
which is
Equation B.37
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