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+//Tested on Windows 7 Ultimate 32-bit

+//Chapter 4 Bipolar Junction transistors Pg no. 141 and 142

+clear;

+clc;

+

+//Given Data

+

+hfe=120;//forward transfer current ratio of CE configuration

+hoe=20D-6;//output conductance of CE configuration in siemens

+hohfe=1D-6;//output conductance of Chfe configuration in siemens

+IE=2D-3;//emitter current in amperes

+VT=26D-3;//temperature equivalent voltage of pn junction

+

+//Solution

+

+disp("(a)");

+re=VT/IE;//emitter diode resistance in ohms

+hi=hfe*re/1000;//input impedance in kilo-ohms

+ro=1/hoe/1000;//output impedance in kilo-ohms

+printf("hi = %.2f kilo-ohms\nro = %d kilo-ohms\nValue of current source is %d*Ib",hi,ro,hfe);

+//output circuit is given as Figure 4.24

+

+disp("(b)");

+hi=re;//input impedance in ohms

+A=hfe/(hfe+1);//current gain alpha of Chfe circuit

+A=round(A);//taking approximate value

+ro=1/hohfe/10^6;//output impedance in mega-ohms

+printf("hi = %d ohms\nro = %d mega-ohms\nValue of current source is %d*Ib",hi,ro,A);

+//output circuit is given as Figure 4.25

+

+//Error in decimal places due to approximations in textbook