3.20.6 Two-Step Drain Side Junction Capacitance

Please refer to the description made for the source side.

For $V_{ed} < V_{edc1}$,

$\begin{aligned} Q_{ed1} = C_{zbd} \cdot &\Bigg[ PBD(T) \cdot \dfrac{1 - \Big( 1 - \dfrac{V_{edc1}}{PBD(T)} \Big)^{1 - MJD} }{1 - MJD} + \\ & SJD \cdot P_{bd2} \cdot \dfrac{1 - \Big( 1 - \dfrac{V_{ed} - V_{edc1}}{P_{bd2}} \Big)^{1 - MJD2}}{1 - MJD2} \Bigg] \end{aligned} \qquad (3.609)$

Else use the $Q_{ed1}$ of single junction above for $V_{ed} > V_{edc1}$, where

$V_{edc1} = PBD(T) \cdot \Big[ 1 - \Big( \dfrac{1}{SJD} \Big)^{\frac{1}{MJD}} \Big] \qquad (3.610)$

$P_{bd2} = \dfrac{PBD(T) \cdot SJD \cdot MJD2}{MJD \cdot \Big( 1 - \dfrac{V_{edc1}}{PBD(T)} \Big)^{-1 - MJD}} \qquad (3.611)$

For $V_{ed} < V_{edc2}$,

$\begin{aligned} Q_{ed2} = C_{zbdsw} \cdot &\Bigg[ PBSWD(T) \cdot \dfrac{1 - \Big( 1 - \dfrac{V_{edc2}}{PBSWD(T)} \Big)^{1 - MJSWD} }{1 - MJSWD} + \\ & SJSWD \cdot P_{bswd2} \cdot \dfrac{1 - \Big( 1 - \dfrac{V_{ed} - V_{ed2}}{P_{bswd2}} \Big)^{1 - MJSWD2}}{1 - MJSWD2} \Bigg] \end{aligned} \qquad (3.612)$

Else use the $Q_{ed2}$ of single junction above for $V_{ed} > V_{edc2}$, where

$V_{edc2} = PBSWD(T) \cdot \Big[ 1 - \Big( \dfrac{1}{SJSWD} \Big)^{\frac{1}{MJSWD}} \Big] \qquad (3.613)$

$P_{bswd2} = \dfrac{PBSWD(T) \cdot SJSWD \cdot MJSWD2}{MJSWD \cdot \Big( 1 - \dfrac{V_{edc2}}{PBSWD(T)} \Big)^{-1 - MJSWD}} \qquad (3.614)$

For $V_{ed} < V_{edc3}$,

$\begin{aligned} Q_{ed3} = C_{zbdswg} \cdot &\Bigg[ PBSWGD(T) \cdot \dfrac{1 - \Big( 1 - \dfrac{V_{edc3}}{PBSWGD(T)} \Big)^{1 - MJSWGD} }{1 - MJSWGD} + \\ & SJSWGD \cdot P_{bswgd2} \cdot \dfrac{1 - \Big( 1 - \dfrac{V_{ed} - V_{edc3}}{P_{bswgd2}} \Big)^{1 - MJSWGD2}}{1 - MJSWGD2} \Bigg] \end{aligned} \qquad (3.615)$

Else use the $Q_{ed3}$ of single junction above for $V_{ed} > V_{edc3}$, where

$V_{edc3} = PBSWGD(T) \cdot \Big[ 1 - \Big( \dfrac{1}{SJSWGD} \Big)^{\frac{1}{MJSWGD}} \Big] \qquad (3.616)$

$P_{bswgd2} = \dfrac{PBSWGD(T) \cdot SJSWGD \cdot MJSWGD2}{MJSWGD \cdot \Big( 1 - \dfrac{V_{edc3}}{PBSWGD(T)} \Big)^{-1 - MJSWGD}} \qquad (3.617)$