MOS Structuroe
PMOS
Second-Order Effect
Body Effect
- $V_B \downarrow, Q_d \uparrow \Longrightarrow V_{TH} \uparrow$
Channal Length Modulation
$$ \begin{equation} r_o = \frac{ 1 }{ \lambda I_D } \end{equation} $$
Subthreshold Conduction
$$ \begin{equation} \begin{aligned} g_{mb} &= \frac{ \partial I_D }{ \partial V_{SB} } \\ &= k_n V_{OV} ( - \frac{ \partial V_{TH} }{ V_{BS} }) \\ &= \eta g_m \end{aligned} \end{equation} $$