Chapter 8 Frequency Effects In Amplifiers

Example 8.6 , Page no:242

import math
from __future__ import division

#initialisation of variables
hie=1000 #Ω
hfe=75 #Ω
Av=50
Rl=10000 #kΩ
hie2=300 #Ω
hfe2=100 #Ω
Re=1000 #kΩ

#CALCULATIONS
Req=Av*(hie/hfe)     #Ω
Rc=Req*Rl/(Rl-Req)  #kΩ
wL=2*3.14*200
Ce=(hie2+(hfe2+1)*Re)/(wL*Re*hie2)*10**6
Av1=(hfe*Req)/(hie+(hfe+1)*Re)

#RESULTS
print"The value of Req=",round(Req,3),"Ohm";
print"The value of Rc=",round(Rc,3),"Ohm";
print"The value of Ce=",round(Ce,3),"mF";
print"The value of Av=",round(Av1,3);

The value of Req= 666.667 Ohm
The value of Rc= 714.286 Ohm
The value of Ce= 268.843 mF
The value of Av= 0.649

Example 8.8 , Page no:244

import math
from __future__ import division

#initialisation of variables
hie2=1500    #Ω
Rb2=5000    #kΩ
Z01=10
Av=7881.3

#CALCULATIONS
C2=1*10**-6   
Zin2=(hie2*Rb2/(hie2+Rb2))
fl=1/(2*3.14*C2*(Zin2+Z01*10**3))

#RESULTS
print"The value of Zin2=",round(Zin2,3),"Ohm";
print"The value of fl=",round(fl,3),"Hz";

The value of Zin2= 1153.846 Ohm
The value of fl= 14.276 Hz