inverter_vtc.m

cmos仿真程序, cmos仿真程序, cmos仿真程序,

function vtc = inverter_vtc(vdd, wn, ln, wp, lp)
% analysis of inverter threshold for 0.25 micron CMOS process
% be aware that this routine can take a long time to run!
eq = 'nmos025(wn,ln,vin,vout,0)+pmos025(wp,lp,vin-vdd,vout-vdd,0)';

xstep = 0.05;
ystep = 0.001;
accuracy = 5.e-7;

for i = 1:(vdd/xstep+1)
   vin = xstep * (i-1);
   for j=1:(vdd/ystep +1)
      vout = ystep * (j-1);
      cur = eval(eq);
      if (abs(cur) < accuracy)
         break;
      end
   end
   vi(i)=vin;
   vtc(i)=vout;
end

plot(vi,vtc,'r-');
xlabel('V_{in} (V)');
ylabel('V_{out} (V)');