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Star-Hspice Quick Reference Guide

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BJT Element<br />

Forward Transit Time Parameters<br />

Parameter Unit Default Description<br />

T0 s 4.75e-12 Low current transit time<br />

at V B’C’ =0<br />

DT0H s 2.1e-12 Time constant for base<br />

and BC SCR width<br />

modulation<br />

TBVL s 40e-12 Voltage for modeling<br />

carrier jam at low V C'E'<br />

TEF0 s 1.8e-12 Storage time in neutral<br />

emitter<br />

GTFE - 1.4 Exponent factor for<br />

current dep. emitter<br />

transit time<br />

THCS s 3.0e-11 Saturation time constant<br />

at high current densities<br />

ALHC - 0.75 Smoothing factor for<br />

current dep. C and B<br />

transit time<br />

FTHC - 0.6 Partitioning factor for<br />

base and collection<br />

portion<br />

ALQF - 0.225 Factor for additional<br />

delay time of Q_f<br />

See “Forward Transit Time Parameters” in the <strong>Star</strong>-<strong>Hspice</strong><br />

Manual.<br />

7-32 <strong>Star</strong>-<strong>Hspice</strong> <strong>Quick</strong> <strong>Reference</strong> <strong>Guide</strong>

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