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+//chapter 15
+//example 15.3
+//page 462
+clear all;
+clc ;
+//given
+vcc=10;//supply voltage(dual supply)
+fo=10;//op frequency
+Ibmax=500;//base current nA
+I4=500;//current through R4 in microA
+vo=vcc-1;//op voltage
+R34=1000*vo/I4;//R3+R4
+//R3=2xR4,R34=3*R4=18;
+R4=R34/3;
+printf("\nR4=%d kohm,use standard value 5.6 kohm",R4);R4=5.6;
+R3=2*R4;
+printf("\nR3=%.1f kohm,use standard value 12 kohm",R3);R3=12;
+R2=R4;printf("\nR2=%.1f kohm",R2);
+R1=R2;printf("\nR1=%.1f kohm",R1);
+C=10^6/(2*%pi*R1*fo);
+printf("\nC=%d pF, standard value 2700 pF",C)
+
+