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diff --git a/1223/CH6/EX6.4/Ex6_4.sce b/1223/CH6/EX6.4/Ex6_4.sce
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+++ b/1223/CH6/EX6.4/Ex6_4.sce
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+clear;
+clc;
+//Example 6.4
+Vtn=1;
+Kn=1;//(mA/V^2)
+//lambda=y
+y=0.015;//V^-1
+Ri=100;//(Kohm)
+Idq=2;//(mA)
+Idt=4;//(mA)
+//Idt=4=Kn*(Vgst-Vtn)^2
+Vgst=sqrt(Idt/Kn)+Vtn;
+printf('\nVgst=%.2f V\n',Vgst)
+Vdst=Vgst-Vtn;
+printf('\nVdst=%.2f V\n',Vdst)
+Vdd=12;
+Vdsq=7;
+Rd=(Vdd-Vdsq)/Idq;
+printf('\nRd =%.2fKOhm\n',Rd)
+Vgsq=sqrt(Idq/Kn)+Vtn;
+printf('\nVgsq=%.2f V\n',Vgsq)
+R1=Ri*Vdd/Vgsq;
+printf('\nR1=%.2f Kohm\n',R1)
+R2=Ri*R1/(R1-Ri);
+printf('\nR2=%.2f Kohm\n',R2)
+g_m=2*Kn*(Vgsq-Vtn);
+printf('\ntransconductance=%.3f mA/V\n',g_m)
+ro=(y*Idq)^-1;
+printf('\noutput resistance=%.2f KOhm\n',ro)
+Av=-g_m*(ro*Rd/(ro+Rd));
+printf('\nsmall signal voltage gain=%.2f\n',Av)