<div dir="ltr">Hello everyone,<div><br></div><div>I'm currently trying to plot the curve of the theoretical RdSOn of a power  MOSFET like in the example:</div><div><br></div><div><a href="http://commons.wikimedia.org/wiki/File:Bv_rdson.png">http://commons.wikimedia.org/wiki/File:Bv_rdson.png</a> </div>
<div><br></div><div>I try to use the psgraph environment of pst-plot but when I write the given equation the plot is not correct. I have to modify the value of the exponent from 2.5 to 320!!</div><div><br></div><div>I also try the same equation using gnuplot and the plot is correct (see attached files). Is there anyone that could help me on with this issue? here is my code:</div>
<div><br></div><div><p style="margin:0px">\documentclass[pstricks]{standalone}</p>
<p style="margin:0px">%</p>
<p style="margin:0px">\usepackage[T1]{fontenc}</p>
<p style="margin:0px">\usepackage{xunicode}</p>
<p style="margin:0px">\usepackage[francais]{babel}</p>
<p style="margin:0px">\usepackage{multicol}</p>
<p style="margin:0px">%%%%%%%%%%%%%%%%%%%%%%%%%</p>
<p style="margin:0px">%ps tricks package</p>
<p style="margin:0px">\usepackage{pstricks}</p>
<p style="margin:0px">\usepackage{pstricks-add}</p>
<p style="margin:0px">\begin{document}</p>
<p style="margin:0px">%PSPICTURE</p>
<p style="margin:0px">  \begin{pspicture}(-1.3,-0.5)(10.3,7.1)</p>
<p style="margin:0px">%%%%%%%%%%%%%%%%%%%%%%%%%%</p>
<p style="margin:0px">%putting the option for the psgraph environment</p>
<p style="margin:0px">\psset{xAxisLabel=$V_{br}(V)$,yAxisLabel=$\displaystyle R_{sp\acute{e}cifique}\left(\frac{\Omega}{cm^2} \right)$,urx=-9cm,ury=0.5cm}</p>
<p style="margin:0px">%%%%%%%%%%%%%%%%%%%%%%%%%%</p>
<p style="margin:0px">%starting the psgraph envrionement with automatic scale </p>
<p style="margin:0px">\begin{psgraph} </p>
<p style="margin:0px">[tickcolor=lightgray,subtickcolor=lightgray,subticksize=0.5,Ox=1,Dx=1,xsubticks=9,xylogBase=10,logLines=all,Oy=-4,Dy=1,ysubticks=9] {->}(1,-4)(1,-4)(3.301,1.18){11cm}{6cm}</p>
<p style="margin:0px">%%%%%%%%%%%%%%%%%%%%%%%%%%</p>
<p style="margin:0px">%plotting the theoretical rdson without leads resistance</p>
<p style="margin:0px">  \psplot[linecolor=darkgray,linestyle=dashed]{1.69879}{3.301}{0.00000000593 320 x exp mul log}</p>
<p style="margin:0px">\end{psgraph}</p>
<p style="margin:0px">%</p>
<p style="margin:0px">  \end{pspicture}</p>
<p style="margin:0px">%</p>
<p style="margin:0px">\end{document}</p><p style="margin:0px"><br></p><p style="margin:0px">thanks</p></div></div>