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diff --git a/1223/CH6/EX6.13/Ex6_13.sce b/1223/CH6/EX6.13/Ex6_13.sce
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+clear;
+clc;
+//Example 6.13
+Vtn=0.8;
+Vtp=-0.8;
+Kn=80*10^-3;
+Kp=40*10^-3;
+//x=W/L
+xn=15;
+xp=10;
+//lambda=y
+yn=0.01;
+yp=0.01;
+Ibias=0.2;
+gm=2*sqrt(Kn*xn*Ibias/2);
+printf('\ntransconductance of the NMOS driver=%.3f mA/V^2\n',gm)
+ron=1/(yn*Ibias);
+printf('\noutput resistances=%.2f Kohm\n',ron)
+Av=-gm*ron/2;
+printf('\nsmall signal voltage gain=%.2f \n',Av)