Chapter 12 : MultiStage Amplifiers

Example 12.1a, Page No 433

In [1]:
import math
#initialisation of variables
Ry=1       #in K
Rg=1       #in M
Ri=1       #in K
hOE=1.0/40        #in K^-1

#fL=1/(2*%pi*(ro+ri)*Cb)<=10
#Since ri=1M , ro<Ry=1K , then ro+ri=1M

#Calculations
Cb=1/(2*math.pi*1*10)

#Results
print("Minimum Value of coupling Capacitance for given FET = %.3f  " %Cb)

Minimum Value of coupling Capacitance for given FET = 0.016

Example 12.1b, Page No 433

In [2]:
import math

#initialisation of variables
Ry=1#in K
Rg=1#in M
Ri=1#in K
hOE=1.0/40         #in K^-1

#fL=1/(2*math.pi*(ro+ri)*Cb)<=10

#Ro>1/hOE=40K  ro=Rc=1K.  Rb>Ri=1K   then  ri=1K

#Calculations
ro=1000.0    #in ohm
ri=1000.0    #in ohm
Cb=1.0/(2*math.pi*10*(ro+ri))

#Results
print("Coupling Capacitance for given transistor = %.2f v " %(Cb*(10**6)))

Coupling Capacitance for given transistor = 7.96 v