1 files changed, 27 insertions, 0 deletions
diff --git a/1223/CH4/EX4.1/Ex4_1.sce b/1223/CH4/EX4.1/Ex4_1.sce
new file mode 100755
index 000000000..9f8db767e
--- /dev/null
+++ b/1223/CH4/EX4.1/Ex4_1.sce
@@ -0,0 +1,27 @@
+clear;
+clc;
+//Example 4.1
+b=100;
+Vcc=12;
+Vbe=0.7;
+Rc=6;
+Rb=50;
+Vbb=1.2;
+//dc solution
+Ibq=(Vbb-Vbe)/Rb;
+printf('\nbase current=%.3f mA\n',Ibq)
+Icq=b*Ibq;
+printf('\ncollector current=%.3f mA\n',Icq)
+Vceq=Vcc-Icq*Rc;
+printf('\ncollector emitter voltage=%.2f V\n',Vceq)
+//transistor is forward biased
+//ac solution 
+V_T=0.026;//(V)
+//small signal hybrid pi parameters
+r_pi=b*V_T/Icq;
+printf('\nsmall signal resistance=%.1f KOhm\n',r_pi)
+g_m=Icq/V_T;
+printf('\ntransconductance=%.3f mA/V\n',g_m)
+//Av=Vo/Vs=-(g_m*Rc)*r_pi/(r_pi+Rb)
+Av=-(g_m*Rc)*r_pi/(r_pi+Rb);
+printf('\nsmall signal voltage gain=%.3f\n',Av)