8 files changed, 93 insertions, 0 deletions
diff --git a/3636/CH13/EX13.1/Ex13_1.sce b/3636/CH13/EX13.1/Ex13_1.sce
new file mode 100644
index 000000000..c2cb39080
--- /dev/null
+++ b/3636/CH13/EX13.1/Ex13_1.sce
@@ -0,0 +1,18 @@
+clear;
+clc;
+l=10*10^-6 //length in m
+f=10*10^9 //frequency in Hz
+n=2*10^14 // n type doping concentration in cm^-3
+e=1.6*10^-19 //in J
+E=3200 //electric field in V/cm
+
+//Calculation
+vd=l*f //converting from m^2 to cm^2
+J=e*n*vd
+myu=-vd/E
+
+format("v",7)
+disp(vd,"Drift velocity (cms^-1)= ")
+format("v",9)
+disp(J,"current density (A/cm^2)= ") 
+disp(myu,"negative electron mobility (cm^2/Vs)= ") //The answer provided in the textbook is wrong
diff --git a/3636/CH13/EX13.1/Ex13_1.txt b/3636/CH13/EX13.1/Ex13_1.txt
new file mode 100644
index 000000000..f878f2157
--- /dev/null
+++ b/3636/CH13/EX13.1/Ex13_1.txt
@@ -0,0 +1,13 @@
+  
+ Drift velocity (cms^-1)=    
+ 
+    1.D+07  
+ 
+ current density (A/cm^2)=    
+ 
+    320
+ 
+ negative electron mobility (cm^2/Vs)=    
+ 
+  - 3125 
+ 
+\ No newline at end of file
diff --git a/3636/CH13/EX13.2/Ex13_2.sce b/3636/CH13/EX13.2/Ex13_2.sce
new file mode 100644
index 000000000..ac81561c6
--- /dev/null
+++ b/3636/CH13/EX13.2/Ex13_2.sce
@@ -0,0 +1,13 @@
+clear;
+clc;
+drift_length=2*10^-4 //in cm
+drift_velocity=2*10^7 //in cm/s
+
+//Calculation
+d=drift_length/drift_velocity
+f=(drift_velocity*10^-2)/(2*drift_length*10^-2)
+
+format("v",8)
+disp(d,"Drift time (s)= ")
+disp(f,"Operating frequency (Hz)= ")
+
diff --git a/3636/CH13/EX13.2/Ex13_2.txt b/3636/CH13/EX13.2/Ex13_2.txt
new file mode 100644
index 000000000..f4c051390
--- /dev/null
+++ b/3636/CH13/EX13.2/Ex13_2.txt
@@ -0,0 +1,9 @@
+  
+ Drift time (s)=    
+ 
+    1.0D-11  
+ 
+ Operating frequency (Hz)=    
+ 
+    5.0D+10  
+ 
+\ No newline at end of file
diff --git a/3636/CH13/EX13.3/Ex13_3.sce b/3636/CH13/EX13.3/Ex13_3.sce
new file mode 100644
index 000000000..205f41891
--- /dev/null
+++ b/3636/CH13/EX13.3/Ex13_3.sce
@@ -0,0 +1,13 @@
+clear;
+clc;
+J=20*10^3 //in kA/cm^2
+e=1.6*10^-19 //in C
+Nd=2*10^15 //in cm^-3
+
+//Calculation
+vz=J/(e*Nd)
+
+format("e",9)
+disp(vz,"avalanche-zone velocity is (cm/s)= ")
+
+ 
diff --git a/3636/CH13/EX13.3/Ex13_3.txt b/3636/CH13/EX13.3/Ex13_3.txt
new file mode 100644
index 000000000..4a6cef9f2
--- /dev/null
+++ b/3636/CH13/EX13.3/Ex13_3.txt
@@ -0,0 +1,4 @@
+  
+ avalanche-zone velocity is (cm/s)=    
+ 
+    6.25D+07  
+\ No newline at end of file
diff --git a/3636/CH13/EX13.4/Ex13_4.sce b/3636/CH13/EX13.4/Ex13_4.sce
new file mode 100644
index 000000000..6cd35382e
--- /dev/null
+++ b/3636/CH13/EX13.4/Ex13_4.sce
@@ -0,0 +1,15 @@
+clear;
+clc;
+e=1.6*10^-19 //in eV
+Nd=2.8*10^21 // donor doping concentration in m^-3
+L=6*10^-6 //length in m
+epsilon_s=8.854*10^-12*11.8 // in F/m
+
+//Calculation
+Vbd=(e*Nd*L^2)/epsilon_s
+Ebd=Vbd/L
+
+format("v",7)
+disp(Vbd,"Breakdown voltage is (V)= ")//The answers vary due to round off error
+format("e",9)
+disp(Ebd,"Breakdown electric field is (V/m)= ")
diff --git a/3636/CH13/EX13.4/Ex13_4.txt b/3636/CH13/EX13.4/Ex13_4.txt
new file mode 100644
index 000000000..7c201966e
--- /dev/null
+++ b/3636/CH13/EX13.4/Ex13_4.txt
@@ -0,0 +1,8 @@
+  
+ Breakdown voltage is (V)=    
+ 
+    154.37  
+ 
+ Breakdown electric field is (V/m)=    
+ 
+    2.57D+07  
+\ No newline at end of file