مدل هایبرید پای

• ${\displaystyle g_{m}={\frac {i_{\mathrm {c} }{v_{\mathrm {be} }{\Bigg |}_{v_{\mathrm {ce} }=0}={\frac {I_{\mathrm {C} }{V_{\mathrm {T} }$

• ${\displaystyle V_{\mathrm {T} }={\begin{matrix}{\frac {kT}{q}\end{matrix}$

• ${\displaystyle r_{\pi }={\frac {v_{\mathrm {be} }{i_{\mathrm {b} }{\Bigg |}_{v_{\mathrm {ce} }=0}={\frac {\beta _{0}{g_{m}={\frac {V_{\mathrm {T} }{I_{\mathrm {B} }\,}$
• ${\displaystyle \beta _{0}={\frac {I_{\mathrm {C} }{I_{\mathrm {B} }\,}$
• ${\displaystyle r_{\mathrm {O} }={\frac {v_{\mathrm {ce} }{i_{\mathrm {c} }{\Bigg |}_{v_{\mathrm {be} }=0}={\frac {V_{\mathrm {A} }+V_{\mathrm {CE} }{I_{\mathrm {C} }\approx {\frac {V_{\mathrm {A} }{I_{\mathrm {C} }$

• ${\displaystyle r_{\mathrm {e} }={\frac {1}{g_{m}$.

• ${\displaystyle g_{m}={\frac {i_{\mathrm {d} }{v_{\mathrm {gs} }{\Bigg |}_{v_{\mathrm {ds} }=0}$

${\displaystyle \ g_{m}={\begin{matrix}{\frac {2I_{\mathrm {D} }{V_{\mathrm {GS} }-V_{\mathrm {th} }\end{matrix}$ ${\displaystyle \ V_{\mathrm {ov} }=V_{\mathrm {GS} }-V_{\mathrm {th} }$

• ${\displaystyle r_{\mathrm {O} }={\frac {v_{\mathrm {ds} }{i_{\mathrm {d} }{\Bigg |}_{v_{\mathrm {gs} }=0}$

${\displaystyle r_{\mathrm {O} }={\begin{matrix}{\frac {1/\lambda +V_{\mathrm {DS} }{I_{\mathrm {D} }\end{matrix}\approx {\begin{matrix}{\frac {V_{E}L}{I_{\mathrm {D} }\end{matrix}$

${\displaystyle \lambda ={\begin{matrix}{\frac {1}{V_{E}L}\end{matrix}$