3.16.1 Impact Ionization Current

$I_{ii}$ can be switched by setting $IIMOD = 0$.

If $IIMOD = 1$,

$\begin{aligned} I_{ii} &= \dfrac{ALPHA0(T) + ALPHA1(T) \cdot L_{eff}}{L_{eff}} \cdot (V_{ds} - V_{dseff}) \cdot I_{ds} \\ & \cdot exp \Bigg( \frac{BETA0(T)}{V_{ds} - V_{dseff}} \Bigg) \end{aligned} \qquad (3.502)$

If $IIMOD = 2$,

$\begin{aligned} I_{ii} &= \dfrac{ALPHAII0(T) + ALPHAII1(T) \cdot L_{eff}}{L_{eff}} \cdot I_{ds} \\ & \cdot exp \Bigg( \dfrac{V_{diff}}{BETAII2_i + BETAII1_i \cdot V_{diff} + BETAII0_i \cdot V_{diff}^2} \Bigg) \end{aligned} \qquad (3.503)$

$V_{diff} = V_{ds} - V_{dsat,ii} \qquad (3.504)$

$V_{dsat,ii} = V_{gs,step} \cdot \Bigg( 1 - \dfrac{LII_i}{L_{eff}} \Bigg) \qquad (3.505)$

$V_{gs,step} = \Bigg( \dfrac{ESATII_i \cdot L_{eff}}{1 + ESATII_i \cdot L_{eff}} \Bigg) \Bigg( \dfrac{1}{1 + SII1_i \cdot V_{gsfbeff}} + SII2_i \Bigg) \Bigg( \dfrac{SII0(T) \cdot V_{gsfbeff}}{1 + SIID_i \cdot V_{ds}} \Bigg) \qquad (3.506)$