Analog Electronics with LabVIEW®

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B.8. SPICE BJT β_DC as a Function of Collector Current

SPICE calculates a dc beta, β_DC, when ISE and NE are included in the transistor model. The equation for the calculation uses β_DC = I_C/I_B, where I_B (forward-active mode) includes the ideal and leakage terms, (B.12),

and I_C is the collector current for the forward-active mode, (B.7),

Using (B.7) and (B.12) in the definition of β_DC, we obtain

Equation B.36

which is

Equation B.37

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B.8. SPICE BJT βDC as a Function of Collector Current

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B.8. SPICE BJT β_DC as a Function of Collector Current