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+// Design Bias Circuit for given Stability Factor
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 5-5 in page 239
+
+clear; clc; close;
+
+// Given data
+Vcc=20; // Supply DC Voltage in V
+Rc=1.5*10^3; // Collector Resistance in ohm
+Vce=8; // Collector-Emitter Resistance in V
+Ic=4*10^-3; // Collector Current in A
+S=12; // Stability Factor of circuit
+beta_bjt=50; // Beta Gain of BJT
+
+// Calculations
+Ib=Ic/beta_bjt;
+Re=(Vcc-Vce-Ic*Rc)/(Ib+Ic);
+Rb=Re*((S*beta_bjt)/((beta_bjt+1)-S));
+Ie=Ic+Ib;
+Vbn=0.2+Ie*Re;
+Vth=Vbn+Ib*Rb;
+R1=(Vcc*Rb)/Vth;
+Ir1=(Vcc-Vbn)/R1;
+Ir2=Ir1-Ib;
+R2=Vbn/Ir2;
+
+// For S=3
+S_2=3;
+Rc_2=1.47*10^3;
+Re_2=Re;
+Rb_2=Re*((S_2*beta_bjt)/((beta_bjt+1)-S_2));
+Vth_2=Vbn+(Ib*Rb_2)+6.16;
+R1_2=(Vcc*Rb_2)/Vth_2;
+Ir1_2=(Vcc-Vbn)/R1_2;
+Ir2_2=Ir1_2-Ib;
+R2_2=Vbn/Ir2-2;
+
+printf("For S=12 \n");
+printf("(a)Ib = %0.2e A \n(b)Ir1 = %0.2e A \n(c)Ir2 = %0.2e A \n",Ib,Ir1,Ir2);
+printf("(d)Re = %0.2e ohm \n(e)Rb = %0.2e ohm \n(f)R1 = %0.2e ohm \n(g)R2 = %0.2e ohm \n",Re,Rb,R1,R2);
+printf("(h)Base-Ground Voltage Vbn = %0.2f V \n(i)Thevenin Voltage Vth = %0.2f V \n",Vbn,Vth);
+printf("\n For S=3 \n");
+printf("(a)Re = %0.2e ohm \n(b)Rb = %0.2e ohm \n(c)R1 = %0.2e ohm \n(d)R2 = %0.2e ohm \n",Re_2,Rb_2,R1_2,R2_2);
+printf("(e)Thevenin Voltage Vth = %0.2f V \n(f)Ir1 = %0.2e A \n(g)Ir2 = %0.2e A \n",Vth_2,Ir1_2,Ir2_2);
+
+// Results
+//  S=12
+// (a) Ib=80 mu-A
+// (b) Re=1.47 K-ohm
+// (c) Rb=21.17 K-ohm
+// (d) Vbn=5.91 V
+// (e) Vth=7.60 V
+// (f) R1=55.71 K-ohm
+// (g) R2=37.16 K-ohm
+// (h) IR1=0.253 mA
+// (i) IR2=0.173 mA
+// S=3
+// (a) Rb=3.13 K-ohm
+// (b) R1=10.16 K-ohm
+// (c) IR1=1.387 mA
+// (d) R2=4.52 K-ohm
+// (e) IR2=1.307 mA
+\ No newline at end of file