1 files changed, 27 insertions, 0 deletions
diff --git a/3754/CH25/EX25.4/25_4.sce b/3754/CH25/EX25.4/25_4.sce
new file mode 100644
index 000000000..603aa716c
--- /dev/null
+++ b/3754/CH25/EX25.4/25_4.sce
@@ -0,0 +1,27 @@
+clear//
+
+//Variables
+
+RC = 4.0 * 10**3              //Collector resistance (in ohm)
+RB = 40.0 * 10**3             //Base resistance (in ohm)
+RS = 10.0 * 10**3             //Source resistance (in ohm)
+hie = 1100.0                  //hie (in ohm)
+hfe = 50.0                    //hfe
+hre=0;hoe=0;dh=0;
+
+//Calculation
+
+RB2 = RB                      //Resistance (in kilo-ohm) 
+rL = RC * RB2 /(RC +RB2)      //a.c. load resistance (in ohm)
+Ai = -hfe                     //Current gain
+Ri = hie                      //Input resistance of the amplifier looking into the base (in ohm) 
+Av = Ai * rL / Ri             //Voltage gain
+RB1 = RB/(1 - Av)             //Resistance (in ohm)
+Ris = Ri * RB1 / (Ri + RB1)   //Input resistance  looking from source terminals (in ohm)
+Ro = "infinite"               //Output resistance (in ohm)
+Ros = rL                      //Output resistance of the stage (in ohm)
+Avs = Av * Ris / (RS + Ris)   //Voltage gain of the stage 
+
+//Result
+
+printf("\n Voltage gain is  %0.1f .\nInput resistance is  %0.0f  ohm.\nOutput resistance is  %0.0f  ohm.",Avs,Ris,Ros)