From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 887/CH13/EX13.1/13_1.sce |  7 +++++++
 887/CH13/EX13.2/13_2.sce | 21 +++++++++++++++++++++
 887/CH13/EX13.4/13_4.sce | 37 +++++++++++++++++++++++++++++++++++++
 887/CH13/EX13.5/13_5.sce | 37 +++++++++++++++++++++++++++++++++++++
 887/CH13/EX13.6/13_6.sce | 27 +++++++++++++++++++++++++++
 887/CH13/EX13.7/13_7.sce | 31 +++++++++++++++++++++++++++++++
 887/CH13/EX13.8/13_8.sce | 42 ++++++++++++++++++++++++++++++++++++++++++
 887/CH13/EX13.9/13_9.sce | 33 +++++++++++++++++++++++++++++++++
 8 files changed, 235 insertions(+)
 create mode 100755 887/CH13/EX13.1/13_1.sce
 create mode 100755 887/CH13/EX13.2/13_2.sce
 create mode 100755 887/CH13/EX13.4/13_4.sce
 create mode 100755 887/CH13/EX13.5/13_5.sce
 create mode 100755 887/CH13/EX13.6/13_6.sce
 create mode 100755 887/CH13/EX13.7/13_7.sce
 create mode 100755 887/CH13/EX13.8/13_8.sce
 create mode 100755 887/CH13/EX13.9/13_9.sce

(limited to '887/CH13')

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')
-- 
cgit