# Chapter 9: Uninjunction Transistor¶

## example 9.1, Page No.310¶

In [4]:
#Stand of voltage and peak point Voltage
import math
#variable declaration

VBB=20                       #in volt
VB=0.7                       #in volt(For Si)
ETA=0.6                      #intrinsic stand off ratio

#Part (i)
#calculations
StandOffVoltage=ETA*VBB;     #in volt

#Resuly
print("\n(i)\nStand Off Voltage in volts :%.0f"%StandOffVoltage)

#Part (ii)
#calculations
VP=ETA*VBB+VB               #in volts

#Result
print("\n(ii)\nPeak point Voltage in volts : %.1f"%VP)

(i)
Stand Off Voltage in volts :12

(ii)
Peak point Voltage in volts : 12.7


## example 9.2, Page no. 310¶

In [8]:
#Time period of sawtooth waveform
import math

#variable declaration
VP=10.0                                   #in volt
R=100.0                                   #in Kohm
C=1000.0                                  #in pF
VBB=20.0                                  #in Volts
ETA=VP/VBB                                #intrinsic stand off ratio

#calculations
T=R*10**3*C*10**-12*math.log(1/(1-ETA))   #in sec

#Resullt
print("Time period of sawtooth wave in micro seconds : %.2f"%(T*10**6))

Time period of sawtooth wave in micro seconds : 69.31


## example 9.3, Page No.311¶

In [10]:
#Resistances RB1 and RB2
import math
#variable declaration
RBB=10                                #in Kohm
ETA=0.6                               #intrinsic stand off ratio

#calculation
RB1=ETA*RBB                           #in Kohm
RB2=RBB-RB1                           #in Kohm

#Result
print("Resistance RB1 in Kohm :%.0f"%RB1)
print("Resistance RB2 in Kohm :%.0f"%RB2)

Resistance RB1 in Kohm :6
Resistance RB2 in Kohm :4