Chapter 11: Thyristors and other Devices

Example 11.1, Page Number: 353

In [1]:
V_AK=20.0;    #VOLTAGE ACROSS ANODE
I_A=1*10**-6;
R_AK=V_AK/I_A;
print('Resistance = %d * 10^6 Ohm'%(R_AK/10**6))

Resistance = 20 * 10^6 Ohm

Example 11.2, Page Number: 354

In [2]:
R_S=10**3;
V_BIAS=110.0;
V_BE=0.7;
V_CE_sat=0.1;
V_A=V_BE+V_CE_sat;    #VOLTAGE ACROSS ANODE
V_R_s=V_BIAS-V_A;    #VOLTAGE ACROSS R_S
I_A=V_R_s/R_S;
print('Anode current = %f A'%I_A)

Anode current = 0.109200 A

Example 11.3, Page Number: 364

In [3]:
n=0.6;
V_BB=20.0;
V_pn=0.7;
V_P=n*V_BB+V_pn;
print('peak point emitter voltage = %.1f Volts'%V_P)

peak point emitter voltage = 12.7 Volts

Example 11.4, page Number: 366

In [4]:
V_BB=30.0;
V_P=14.0;
I_P=20.0*10**-6;
V_V=1.0;
I_V=10.0*10**-3;
x=(V_BB-V_P)/I_P;
y=(V_BB-V_V)/I_V;
print('R1 should be less than %d Ohms'%x)
print('R1 should be more than %d Ohms'%y)

R1 should be less than 800000 Ohms
R1 should be more than 2900 Ohms

Example 11.5, Page Number: 376

In [5]:
import math
n2=1.3;    #cladding index
n1=1.35;    #core index
theta=math.acos(n2/n1);
t=theta*180/math.pi;
print('critical angle in degrees \n\t%f'%t)

critical angle in degrees 
	15.642471