initial commit / add all books

6 files changed, 87 insertions, 0 deletions

diff --git a/2825/CH8/EX8.1/Ex8_1.sce b/2825/CH8/EX8.1/Ex8_1.sce
new file mode 100755
index 000000000..312ecce92
--- /dev/null
+++ b/2825/CH8/EX8.1/Ex8_1.sce
@@ -0,0 +1,19 @@
+//Ex8_1 pg-434

+clc

+

+A=120 //amplification gain

+Vi=50*10^(-3) //input voltage

+Beta=0.1 //feedback factor

+

+Vo= A*Vi //output voltage without feedback

+printf("Input signal = %.2f V \n",Vo)

+

+Vs=Vi-Beta*Vo 

+//input signal +ve output because of -ve feedback (calue in texxtbook is wrong)

+printf(" Input signal = %.2f V \n",abs(Vs))

+

+vg=A/(1+Beta*A) //voltage gain 

+printf(" Gain after feedback = %.1f \n",vg)

+

+fb=(-1)*20*log10(1+(Beta*A))

+printf(" Feedback (db)= %.3f \n",fb)

diff --git a/2825/CH8/EX8.2/Ex8_2.sce b/2825/CH8/EX8.2/Ex8_2.sce
new file mode 100755
index 000000000..1fc70744e
--- /dev/null
+++ b/2825/CH8/EX8.2/Ex8_2.sce
@@ -0,0 +1,8 @@
+//Ex8_2 pg-435

+clc

+

+ff=4 //feedback factor

+BW=6*10^(6) //bandwidth in Hz

+

+BW_fb=BW*(1+ff) //Bandwidth with feedback factor(since Beta is +ve)

+printf("Bandwidth with feedback factor = %.0f MHz",BW_fb*10^-6)

diff --git a/2825/CH8/EX8.3/Ex8_3.sce b/2825/CH8/EX8.3/Ex8_3.sce
new file mode 100755
index 000000000..5dd4381ae
--- /dev/null
+++ b/2825/CH8/EX8.3/Ex8_3.sce
@@ -0,0 +1,9 @@
+//Ex8_3 pg-435

+clc

+

+openA=60000 //open loop gain 

+closeA=10000 //closed loop gain

+Beta=((openA/closeA)-1)/closeA

+printf("Negative Feedback factor = %.4f \n",Beta)

+BA=Beta*openA //value of Beta*A

+printf(" Beta*A = %.0f",BA)

diff --git a/2825/CH8/EX8.4/Ex8_4.sce b/2825/CH8/EX8.4/Ex8_4.sce
new file mode 100755
index 000000000..bb91c251e
--- /dev/null
+++ b/2825/CH8/EX8.4/Ex8_4.sce
@@ -0,0 +1,12 @@
+//Ex8_4 pg-435

+clc

+

+Df=0.5/100 //distortion after negative feedback

+D=8/100 //harmonic distortion 

+

+BA=D/Df-1 //value of Beta*A

+A=200

+Beta=BA/A //feedback factor

+printf("Feedback factor = %.3f \n",Beta)

+Af=A/(1+BA) //Gain after -ve feedback

+printf("Gain after negative feedback = %.1f",Af)

diff --git a/2825/CH8/EX8.5/Ex8_5.sce b/2825/CH8/EX8.5/Ex8_5.sce
new file mode 100755
index 000000000..712ba3df9
--- /dev/null
+++ b/2825/CH8/EX8.5/Ex8_5.sce
@@ -0,0 +1,13 @@
+//Ex8_5 pg-436

+clc

+

+A=100 //voltage gain

+per=10/100 //percentage of negative feedback applied

+BA=A*per //value of Beta*A

+Af=A/(1+BA) //gain after negative feedback

+printf("Decrement in distortion,D-Df = D-(D/(1+Beta*A)) \n")

+printf("                              = %.1f\n ",Af)

+per_dis=(BA/(1+BA))*100 //percentage change in distortion 

+printf("Percentage change in distortion = %.0f %% \n",per_dis)

+red=100-per_dis //reduction

+printf(" Therefore reduction is = %.0f %%",red)

diff --git a/2825/CH8/EX8.6/Ex8_6.sce b/2825/CH8/EX8.6/Ex8_6.sce
new file mode 100755
index 000000000..5df99cc10
--- /dev/null
+++ b/2825/CH8/EX8.6/Ex8_6.sce
@@ -0,0 +1,26 @@
+//Ex8_6 pg-436

+clc

+

+A=50 //voltage gain

+per=10/100 //percentage of negative feedback applied

+BA=per*A //value of Beta*A

+Af=A/(1+BA) //gain after negative feedback

+printf("(1) Voltage gain after negative feedback \n")

+printf("                              = %.2f\n ",Af)

+

+A=50 //voltage gain

+per=5/100 //percentage of negative feedback applied

+BA=per*A //value of Beta*A

+Af1=A/(1+BA) //gain after negative feedback

+printf("(2) Voltage gain after negative feedback \n")

+printf("                              = %.1f\n ",Af1)

+disp("So the new gain is not double the previous case")

+disp("    The difference between expected value and actual value of gain obtained is")

+diff_value=2*Af-Af1 

+printf("                             = %.2f",diff_value)

+

+printf("\n\n(3) To have the gain double of case(1) i.e 16.66,let the \n feedback introduced be Beta(assuming negative feedback)")

+Af=16.66 //voltage gain with negative feedback

+A=50 //voltage gain

+Beta=((A/Af)-1)/A //feedback in percentage

+printf("\n                  Beta = %.2f",Beta)