initial commit / add all books

8 files changed, 235 insertions, 0 deletions

diff --git a/887/CH13/EX13.1/13_1.sce b/887/CH13/EX13.1/13_1.sce
new file mode 100755
index 000000000..cb6718e6c
--- /dev/null
+++ b/887/CH13/EX13.1/13_1.sce
@@ -0,0 +1,7 @@
+clc

+//ex13.1

+V_CE=4;      //It should be high enough so that collector base junction is reverse-biased

+i_B=30*10^-6;      //base current, a value is selected from the graph

+i_C=3*10^-3;      //collector current corresponding to values of i_B and V_CE

+B=i_C/i_B;      //beta value

+disp(B,'The value of beta B is')

diff --git a/887/CH13/EX13.2/13_2.sce b/887/CH13/EX13.2/13_2.sce
new file mode 100755
index 000000000..f223d9280
--- /dev/null
+++ b/887/CH13/EX13.2/13_2.sce
@@ -0,0 +1,21 @@
+clc

+//ex13.2

+V_CC=10;

+V_BB=1.6;

+R_B=40*10^3;

+R_C=2*10^3;

+V_in_Q=0;      //Q point

+V_in_max=0.4;

+V_in_min=-0.4;

+//the following values are found from the intersection of input loadlines with the input characteristic

+i_B_Q=25*10^-3;      //for V_in_Q

+i_B_max=35*10^-3;      //for V_in_max

+i_B_min=15*10^-3;      //for V_in_min

+//the following values are found from the intersection of output loadlines with the output characteristic

+V_CE_Q=5;      //corresponding to i_B_Q

+V_CE_max=7;      //corresponding to i_B_min

+V_CE_min=3;      //corresponding to i_B_max

+disp('graphs cannot be shown but the required values are')

+disp(V_CE_max,'maximum value of V_CE')

+disp(V_CE_min,'minimum value of V_CE')

+disp(V_CE_Q,'Q-point value of V_CE')

diff --git a/887/CH13/EX13.4/13_4.sce b/887/CH13/EX13.4/13_4.sce
new file mode 100755
index 000000000..d937e7a60
--- /dev/null
+++ b/887/CH13/EX13.4/13_4.sce
@@ -0,0 +1,37 @@
+clc

+//ex13.4

+V_CC=15;

+B=100;      //beta value

+R_B=200*10^3;

+R_C=1*10^3;

+//we proceed in such a way that the required values will be displayed according to the satisfied condition of the below three cases

+

+//a)cut-off region

+V_BE=15;      //no voltage drop across R_B in cut-off state

+V_CE=15;      //no voltage drop across R_C in cut-off state

+i_C=0;      //no collector current flows as there is no voltage drop

+i_B=0;      //no base current flows as there is no voltage drop

+if(V_BE<0.5) then,      //cut-off condition

+    disp(i_C,'collector current in amperes')

+    disp(V_CE,'collector to emitter voltage in volts')

+    end

+

+//b)saturation region

+V_BE=0.7;      //base to emitter voltage in saturation state

+V_CE=0.2;      //collector to emitter voltage in saturation state

+i_C=(V_CC-V_CE)/R_C;      //collector current

+i_B=(V_CC-V_BE)/R_B;      //base current

+if((B*i_B>i_C)&(i_B>0)) then,      //saturation state conditions

+        disp(i_C,'collector current in amperes')

+        disp(V_CE,'collector to emitter voltage in volts')

+    end

+

+//c)active region

+V_BE=0.7;      //base to emitter voltage in active state

+i_B=(V_CC-V_BE)/R_B;      //base current

+i_C=B*i_B;      //collector current in active state

+V_CE=V_CC-i_C*R_C;      //collector to emitter voltage

+if((V_CE>0.2)&(i_B>0)) then,      //active state conditions

+        disp(i_C,'collector current in amperes')

+        disp(V_CE,'collector to emitter voltage in volts')

+    end

diff --git a/887/CH13/EX13.5/13_5.sce b/887/CH13/EX13.5/13_5.sce
new file mode 100755
index 000000000..e70cbf697
--- /dev/null
+++ b/887/CH13/EX13.5/13_5.sce
@@ -0,0 +1,37 @@
+clc

+//ex13.5

+R_B=200*10^3;

+R_C=1*10^3;

+V_CC=15;

+B=300;      //beta value

+//we proceed in such a way that the required values will be displayed according to the satisfied condition of the below three cases

+

+//a)active region

+V_BE=0.7;      //base to emitter voltage in active state

+i_B=(V_CC-V_BE)/R_B;      //base current

+i_C=B*i_B;      //collector current in active state

+V_CE=V_CC-i_C*R_C;      //collector to emitter voltage

+if((V_CE>0.2)&(i_B>0)) then,      //active state conditions

+        disp(i_C,'collector current in amperes')

+        disp(V_CE,'collector to emitter voltage in volts')

+    end

+

+//b)saturation region

+V_BE=0.7;      //base to emitter voltage in saturation state

+V_CE=0.2;      //collector to emitter voltage in saturation state

+i_C=(V_CC-V_CE)/R_C;      //collector current

+i_B=(V_CC-V_BE)/R_B;      //base current

+if((B*i_B>i_C)&(i_B>0)) then,      //saturation state conditions

+        disp(i_C,'collector current in amperes')

+        disp(V_CE,'collector to emitter voltage in volts')

+    end

+

+//c)cut-off region

+V_BE=15;      //no voltage drop across R_B in cut-off state

+V_CE=15;      //no voltage drop across R_C in cut-off state

+i_C=0;      //no collector current flows as there is no voltage drop

+i_B=0;      //no base current flows as there is no voltage drop

+if(V_BE<0.5) then,      //cut-off condition

+    disp(i_C,'collector current in amperes')

+    disp(V_CE,'collector to emitter voltage in volts')

+    end

diff --git a/887/CH13/EX13.6/13_6.sce b/887/CH13/EX13.6/13_6.sce
new file mode 100755
index 000000000..a7699d7d9
--- /dev/null
+++ b/887/CH13/EX13.6/13_6.sce
@@ -0,0 +1,27 @@
+clc

+//ex13.6

+V_CC=15;

+V_BB=5;

+V_BE=0.7;      //assuming the device is in the active state

+R_C=2*10^3;

+R_E=2*10^3;

+i_E=(V_BB-V_BE)/R_E;      //emitter current

+printf(" All the values in the textbook are Approximated hence the values in this code differ from those of Textbook")

+

+//a)B=100

+disp('For beta B=100:')

+B=100;      //beta value

+i_B=i_E/(B+1);      //base current

+i_C=B*i_B;      //collector current

+V_CE=V_CC-i_C*R_C-i_E*R_E;      //collector to emitter voltage

+disp(i_C,'collector current in amperes')

+disp(V_CE,'collector to emitter voltage in volts')

+

+//b)B=300

+disp('For beta B=300:')

+B=300;      //beta value

+i_B=i_E/(B+1);      //base current

+i_C=B*i_B;      //collector current

+V_CE=V_CC-i_C*R_C-i_E*R_E;      //collector to emitter voltage

+disp(i_C,'collector current in amperes')

+disp(V_CE,'collector to emitter voltage in volts')

diff --git a/887/CH13/EX13.7/13_7.sce b/887/CH13/EX13.7/13_7.sce
new file mode 100755
index 000000000..0c2afde08
--- /dev/null
+++ b/887/CH13/EX13.7/13_7.sce
@@ -0,0 +1,31 @@
+clc

+//ex13.7

+V_CC=15;

+R_1=10*10^3;

+R_2=5*10^3;

+R_C=1*10^3;

+R_E=1*10^3;

+V_BE=0.7;

+R_B=1/((1/R_1)+(1/R_2));      //thevenin resistance

+V_B=V_CC*R_2/(R_1+R_2);      //thevenin voltage

+printf(" All the values in the textbook are Approximated hence the values in this code differ from those of Textbook")

+

+//a)B=100

+disp('For beta B=100:')

+B=100;      //beta value

+i_B=(V_B-V_BE)/(R_B+(B+1)*R_E);      //base current

+i_C=B*i_B;      //collector current

+i_E=i_B+i_C;      //emitter current

+V_CE=V_CC-i_C*R_C-i_E*R_E;      //collector to emitter voltage

+disp(i_C,'collector current in amperes')

+disp(V_CE,'collector to emitter voltage in volts')

+

+//b)B=300

+disp('For beta B=300:')

+B=300;      //beta value

+i_B=(V_B-V_BE)/(R_B+(B+1)*R_E);      //base current

+i_C=B*i_B;      //collector current

+i_E=i_B+i_C;      //emitter current

+V_CE=V_CC-i_C*R_C-i_E*R_E;      //collector to emitter voltage

+disp(i_C,'collector current in amperes')

+disp(V_CE,'collector to emitter voltage in volts')

diff --git a/887/CH13/EX13.8/13_8.sce b/887/CH13/EX13.8/13_8.sce
new file mode 100755
index 000000000..e22ab2fb6
--- /dev/null
+++ b/887/CH13/EX13.8/13_8.sce
@@ -0,0 +1,42 @@
+clc

+//ex13.8

+V_CC=15;

+V_BE=0.7;

+B=100;      //beta value

+R_1=10*10^3;

+R_2=5*10^3;

+R_L_1=2*10^3;      //R_L is taken as R_L_1

+R_C=1*10^3;

+R_E=1*10^3;

+V_T=26*10^-3;      //thermal voltage

+//from the analysis of the previous example we have the the values of i_C_Q and V_CE

+i_C_Q=4.12*10^-3;

+V_CE=6.72;

+r_pi=(B*V_T)/i_C_Q;

+R_B=1/((1/R_1)+(1/R_2));      //thevenin resistance

+R_L_2=1/((1/R_L_1)+(1/R_C));      //R_L' is taken as R_L_2

+A_v=-(R_L_2*B)/r_pi;      //voltage gain

+A_voc=-(R_C*B)/r_pi;      //open circuit voltage gain

+Z_in=1/((1/R_B)+(1/r_pi));      //input impedance

+A_i=(A_v*Z_in)/R_L_1;      //current gain

+G=A_i*A_v;      //power gain

+Z_o=R_C      //output impedance

+//assume f=1hz

+f=1;

+t=0:0.0005:3;

+V_in=0.001*sin(2*%pi*f*t);

+V_o=-(V_in*R_L_2*B)/r_pi;

+subplot(121)

+xtitle('Input voltage vs time','time','input voltage')

+plot(t,V_in)

+subplot(122)

+xtitle('output voltage vs time','time','output voltage')

+plot(t,V_o)

+//In the graph, notice the phase inversion between input and output voltages

+printf(" All the values in the textbook are Approximated hence the values in this code differ from those of Textbook")

+disp(A_v,'voltage gain')

+disp(A_voc,'open circuit voltage gain')

+disp(Z_in,'input impedance in ohms')

+disp(A_i,'current gain')

+disp(G,'power gain')

+disp(Z_o,'output impedance in ohms')

diff --git a/887/CH13/EX13.9/13_9.sce b/887/CH13/EX13.9/13_9.sce
new file mode 100755
index 000000000..66f035ff6
--- /dev/null
+++ b/887/CH13/EX13.9/13_9.sce
@@ -0,0 +1,33 @@
+clc

+//ex_13.9

+V_CC=20;

+V_BE_Q=0.7;

+V_T=26*10^-3;      //thermal voltage

+B=200;      //beta value

+R_S_1=10*10^3;      //R_S is taken as R_S_1

+R_1=100*10^3;

+R_2=100*10^3;

+R_L_1=1*10^3;      //R_L is taken as R_L_1

+R_E=2*10^3;

+V_B=V_CC*R_2/(R_1+R_2);      //thevenin voltage

+R_B=1/((1/R_1)+(1/R_2));      //thevenin resistance

+R_L_2=1/((1/R_L_1)+(1/R_E));      //R_L' is taken as R_L_2

+i_B_Q=(V_B-V_BE_Q)/(R_B+R_E*(1+B))

+i_C_Q=B*i_B_Q;

+i_E_Q=i_B_Q+i_C_Q;

+V_CE_Q=V_CC-i_E_Q*R_E;

+//we can verify that the device is in active region as we get V_CE>0.2 and i_BQ>0

+r_pi=B*V_T/i_C_Q;

+A_v=(1+B)*R_L_2/(r_pi+(1+B)*R_L_2);      //voltage gain

+Z_it=r_pi+(1+B)*R_L_2;      //input impedance of base of transistor

+Z_i=1/((1/R_B)+(1/Z_it));      //input impedance of emitter-follower

+R_S_2=1/((1/R_S_1)+(1/R_1)+(1/R_2));      //R_S' is taken as R_S_2

+Z_o=1/(((1+B)/(R_S_2+r_pi))+(1/R_E));      //output impedance

+A_i=A_v*Z_i/R_L_1;      //current gain

+G=A_v*A_i;      //power gain

+printf(" All the values in the textbook are Approximated hence the values in this code differ from those of Textbook")

+disp(A_v,'voltage gain')

+disp(Z_i,'input impedance in ohms')

+disp(A_i,'current gain')

+disp(G,'power gain')

+disp(Z_o,'output impedance in ohms')