initial commit / add all books

8 files changed, 160 insertions, 0 deletions

diff --git a/1514/CH7/EX7.1/ch7_1.sce b/1514/CH7/EX7.1/ch7_1.sce
new file mode 100755
index 000000000..ae32e0ebd
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@@ -0,0 +1,18 @@
+//chapter 7

+//example 7.1

+//page 196

+clear;

+clc ;

+//given

+Vce=20;  //collector to emitter voltage in volts

+T=125 ; //temperature in degreeC

+excessT=T-25; 

+D=2.81*excessT; //derating in power of device in mW

+

+//maximum power dissipation in mW

+PD=310-D; //from datasheet of 2N3904

+

+//max collector current in mA

+Ic=PD/Vce; 

+

+printf('maximum Ic that can be used is %.2f mA',Ic);

diff --git a/1514/CH7/EX7.2/ch7_2.sce b/1514/CH7/EX7.2/ch7_2.sce
new file mode 100755
index 000000000..d95b81617
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+++ b/1514/CH7/EX7.2/ch7_2.sce
@@ -0,0 +1,16 @@
+//chapter 7

+//example 7.2

+//page 198

+clear;

+clc ;

+//given

+T=78;//temperature in degreeC

+PD1=115; //maximum power dissipation in W at 25 degreeC

+excessT=T-25;

+D=0.66*excessT; //derating in power of device in W

+PD=round(PD1-D); //maximum power dissipation in W at 78 degreeC

+

+Vce=[60 40 20 10]; //collector to emitter voltage in volts

+Ic=(PD./Vce);

+plot(Vce,Ic)

+xtitle('maximum PD curve','collector to emitter voltage in volts (Vce)','collector current (Ic)');

diff --git a/1514/CH7/EX7.3/ch7_3.sce b/1514/CH7/EX7.3/ch7_3.sce
new file mode 100755
index 000000000..e1bf99a8a
--- /dev/null
+++ b/1514/CH7/EX7.3/ch7_3.sce
@@ -0,0 +1,18 @@
+//chapter 7

+//example 7.3

+//page 201

+clear;

+clc ;

+//given

+thetaJC=1; //junction to case thermal impedance in degreeC/W

+Tj=90; //junction temperature

+Ta=25; // ambient temperature

+

+Vce=25;//collector to emitter voltage in volts

+Ic=1;//collector current in A

+Q=Vce*Ic; //transistor power dissipation in W

+

+thetaCA=(Tj-Ta)/Q-thetaJC; //case to air thermal impedance (thetaCS+thetaCA)

+

+printf('thetaCA=%.1f degreeC/W',thetaCA)

+disp("Choose small and least expensive heat sink i.e. NC-421")

diff --git a/1514/CH7/EX7.4/ch7_4.sce b/1514/CH7/EX7.4/ch7_4.sce
new file mode 100755
index 000000000..b5469ff0c
--- /dev/null
+++ b/1514/CH7/EX7.4/ch7_4.sce
@@ -0,0 +1,12 @@
+//chapter 7

+//example 7.4

+//page 203

+clear all;

+clc ;

+//given

+P1=50; //output power when signal frequency is 5khz in mW

+P2=25; //output power when signal frequency is 25khz in mW

+

+//change in output power in decibel

+P=10* log10(P2/P1)

+printf('change in output power in decibel=%d dB',P);

diff --git a/1514/CH7/EX7.5/ch7_5.sce b/1514/CH7/EX7.5/ch7_5.sce
new file mode 100755
index 000000000..ccd79141e
--- /dev/null
+++ b/1514/CH7/EX7.5/ch7_5.sce
@@ -0,0 +1,12 @@
+//chapter 7

+//example 7.5

+//page 203

+clear all;

+clc ;

+//given

+V1=1; //output voltage when signal frequency is 5khz in V

+V2=0.707; //output voltage when signal frequency is 20khz in V

+

+//change in output voltage in decibel

+P=20* log10(V2/V1)

+printf('change in output power in decibel=%d dB',P);

diff --git a/1514/CH7/EX7.6/ch7_6.sce b/1514/CH7/EX7.6/ch7_6.sce
new file mode 100755
index 000000000..04682be41
--- /dev/null
+++ b/1514/CH7/EX7.6/ch7_6.sce
@@ -0,0 +1,31 @@
+//chapter 7

+//example 7.6

+//page 206

+clear;

+clc ;

+//given

+fab=5; //common base cutoff frequency in MHz

+hfe=50; //common emitter current gain

+Cs=100; //load capacitor in pF

+Rc1=10; 

+Rc2=100; //collector capacitor in Kohm 

+

+//case 1

+fae=fab/hfe*10^3; //common emitter cutoff frequency in KHz

+//signal frequency

+fs1=(1/(2*%pi*Cs*Rc1)*10^6);

+if fae<fs1 then

+f2=fae;

+else 

+    f2=fs1;

+end

+printf('\nupper 3dB point for Rc1 is %d kHz',f2);

+

+//case 2

+fs2=(1/(2*%pi*Cs*Rc2)*10^6);

+if fae<fs2 then

+    f2=fae;

+else 

+    f2=fs2;

+end

+printf('\nupper 3dB point for Rc2 is %.1f kHz',f2);

diff --git a/1514/CH7/EX7.7/ch7_7.sce b/1514/CH7/EX7.7/ch7_7.sce
new file mode 100755
index 000000000..9219c6624
--- /dev/null
+++ b/1514/CH7/EX7.7/ch7_7.sce
@@ -0,0 +1,19 @@
+//chapter 7

+//example 7.7

+//page 208

+clear;

+clc ;

+//given

+hfe=75;//forward current gain

+hie=2;// input resistance in kohm

+Rc=5;//collector resistance in kohm

+Ccb=4; //capacitance between collector and base

+Cbe=10;//capacitance between base and emitter

+

+//gain 

+Av=ceil(hfe*Rc/hie);

+

+//input capacitance

+Cin=Cbe+(1+Av)*Ccb; //in pF

+

+printf('input capacitance is %d pF',Cin);

diff --git a/1514/CH7/EX7.8/ch7_8.sce b/1514/CH7/EX7.8/ch7_8.sce
new file mode 100755
index 000000000..507cb58f9
--- /dev/null
+++ b/1514/CH7/EX7.8/ch7_8.sce
@@ -0,0 +1,34 @@
+//chapter 7

+//example 7.1

+//page 196

+clear;

+clc ;

+//given

+Vce=5;//collector to emitter voltage in volts 

+Ic=5;//collector current in microA

+Rg=50;//total noise generating resistance in ohm

+Ri=25;//i/p resistance in kohm

+NF=1; //noise figure in dB

+//noise factor

+F=10^(NF/10);

+Av=30;//gain

+//rms noise voltage

+K=1.37*10^-23;//boltzman's constant J/K

+T=298;//absolute temperature in kelvin

+B=9;//circuit bandwidth in Hz

+

+en=sqrt(4*K*T*B*Rg*10^6)*10^6//in microV

+

+//i/p noise

+eni=en*Ri/(Ri+Rg)

+

+//output noise

+eno=round(Av*eni);

+

+//total rms noise output voltage

+Vn=sqrt(F*eno^2);

+

+printf('total rms noise output voltage is %.1f microV',Vn);

+

+

+