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+//Tested on Windows 7 Ultimate 32-bit

+//Chapter 8 Power Amplifiers Pg no. 279

+clear;

+clc;

+

+//Given Data

+//Figure 8.13

+

+VCC=20;//collector supply voltage in volts

+RC=270;//collector resistance in ohms

+RE=150;//emitter resistance in ohms

+R1=3.3D3;//divider network resistance R1 in ohms

+R2=1.5D3;//divider network resistance R2 in ohms

+VBE=0.7;//forward voltage drop of emitter diode in volts

+B=100;//DC CE current gain beta

+RL=470;//load resistance in ohms

+C1=15D-6;//input coupling capacitance in farads

+C2=15D-6;//output coupling capacitance in farads

+

+//Solution

+

+VB=VCC*R2/(R1+R2);//base to ground voltage in volts

+VE=VB-VBE;//emitter to ground voltage in volts

+IE=VE/RE;//emitter current in amperes

+ICQ=IE;//neglecting base current, collector current is equal to emitter current in amperes

+VC=VCC-ICQ*RC;//collector to ground voltage in volts

+VCEQ=VC-VE;//collector to emitter quiscent voltage in volts

+RL_dash=RC*RL/(RC+RL);//equivalent a.c. load resistance in ohms

+VCEQ_midpt=(VCEQ+ICQ*RL_dash)/2;//collector to emitter voltage in Q point is set at midpoint of load line

+Pout_max=0.5*VCEQ_midpt^2/RL_dash;//maximum output power for amplifier

+printf("Maximum value of load power Pout(max) = %d milli-Watts",Pout_max*10^3);