\newcommand\height{2.0}

\draw (4.75, \height/2) coordinate (vdsp)  
   to [short,o-,i_=$\underline{I}_{\mathrm{D}}$] ++ (-1.25,0) coordinate (rop)  
   to [short,*-] ++ (-2.00,0)
   to [ american controlled current source
      , l=$g_{\mathrm{m}}\underline{V}_{\mathrm{GS}}$
      ] ++ (0,-\height) coordinate (gnd)
   to [short,-*] (gnd-|rop) coordinate (ron)         
   to [short,-o] (gnd-|vdsp) coordinate (vdsn);

\draw (rop) to [R,l=$g_{\mathrm{DS}}$]  (ron);
\draw [] (0,  \height/2) coordinate (vgsp)   to [short,o-]   ++ (0.5,0);
\draw [] (0, -\height/2) coordinate (vgsn)   to [short,o-*]  (gnd);  

\path [voltarrow] (vgsp) edge node [midway,left,inner sep=2pt] 
    {$\underline{V}_{\mathrm{GS}}$} (vgsn);
\path [voltarrow] (vdsp) edge node [midway,right,inner sep=2pt] 
  {$\underline{V}_{\mathrm{DS}}$} (vdsn);
\node[anchor=east] at (vgsp) {G};
\node[anchor=east] at (vgsn) {S};
\node[anchor=west] at (vdsp) {D};
\node[anchor=west] at (vdsn) {S};