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NMOS

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class NMOS "Simple MOS Transistor" 
  parameter Real W=20.e-6 "Width";
  parameter Real L=6.e-6 "Length";
  parameter Real Beta=0.041e-3    "Transconductance parameter";
  parameter Real Vt=0.8 "Zero bias threshold voltage";
  parameter Real K2=1.144 "Bulk threshold parameter";
  parameter Real K5= 0.7311"Reduction of pinch-off region";
  parameter Real dW=-2.5e-6 "narrowing of channel";
  parameter Real dL= -1.5e-6"shortening of channel";
  parameter Real RDS=1.e+7 "Drain-Source-Resistance";

  Pin D "Drain";
  Pin G "Gate";
  Pin S "Source";
  Pin B "Bulk";

  Real v;
  Real uds;
  Real ubs;
  Real ugst;
  Real ud;
  Real us;
  Real id,gds;
equation  
    //assert (L + dL > 0, "Effective length must be positive");
    //assert (W + dW > 0, "Effective width  must be positive");

  gds = if noEvent(RDS < 1.e-20 and RDS > -1.e-20) then 1.e20 else 1/RDS;
  v = Beta*(W + dW)/(L + dL);
  ud = if noEvent(D.v < S.v) then S.v else D.v;
  us = if noEvent(D.v < S.v) then D.v else S.v;
  uds = ud - us;
  ubs = if noEvent(B.v > us) then 0 else B.v - us;
  ugst = (G.v - us - Vt + K2*ubs)*K5;
  id = if noEvent(ugst <= 0) then uds*gds else if noEvent(ugst > uds) then v*uds*(ugst
     - uds/2) + uds*gds else v*ugst*ugst/2 + uds*gds;
  G.i = 0;
  D.i = if noEvent(D.v < S.v) then -id else id;
  S.i = -D.i;
  B.i = 0;
end NMOS;