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-rw-r--r--3809/CH18/EX18.1/EX18_1.sce19
-rw-r--r--3809/CH18/EX18.10/EX18_10.sce25
-rw-r--r--3809/CH18/EX18.11/EX18_11.sce30
-rw-r--r--3809/CH18/EX18.2/EX18_2.sce22
-rw-r--r--3809/CH18/EX18.3/EX18_3.sce28
-rw-r--r--3809/CH18/EX18.4/EX18_4.sce13
-rw-r--r--3809/CH18/EX18.6/EX18_6.sce30
-rw-r--r--3809/CH18/EX18.7/EX18_7.sce27
-rw-r--r--3809/CH18/EX18.8/EX18_8.sce40
-rw-r--r--3809/CH18/EX18.9/EX18_9.sce20
10 files changed, 254 insertions, 0 deletions
diff --git a/3809/CH18/EX18.1/EX18_1.sce b/3809/CH18/EX18.1/EX18_1.sce
new file mode 100644
index 000000000..2e457afd3
--- /dev/null
+++ b/3809/CH18/EX18.1/EX18_1.sce
@@ -0,0 +1,19 @@
+//Chapter 18, Example 18.1
+clc
+//Initialisation
+VCC=10 //voltage
+VBE=0.7 //base emitter voltage
+RB=910*10**3 //resistance in ohm
+hfe=100 //HFE parameter of the transistor
+RC=4.7*10**3 //resistance in ohm
+
+
+//Calculation
+IB=(VCC-VBE)/RB //base current in ampere
+IC=hfe*IB //collector current in ampere
+Vq=VCC-(IC*RC) //quiescent output voltage
+
+
+//Results
+printf("Quiescent Output Current = %.2f mA\n",IC*1000)
+printf("Quiescent Output Voltage = %.1f V\n",Vq)
diff --git a/3809/CH18/EX18.10/EX18_10.sce b/3809/CH18/EX18.10/EX18_10.sce
new file mode 100644
index 000000000..4883b9768
--- /dev/null
+++ b/3809/CH18/EX18.10/EX18_10.sce
@@ -0,0 +1,25 @@
+//Chapter 18, Example 18.10
+clc
+//Initialisation
+VCC=10 //voltage
+R2=10*10**3 //resistance in ohm
+R1=27*10**3 //resistance in ohm
+RE=100 //resistance in ohm
+RC=2.2 //resistance in ohm
+VBE=0.7 //base emitter voltage
+av=1 //small sg voltage gain
+
+
+//Calculation
+VB=VCC*(R2/(R1+R2)) //Quiescent base voltage
+VE=VB-VBE //Quiescent emitter voltage
+IE=VE/RE //Quiescent emitter current
+ri=(R1*R2)/(R1+R2) //input resistance
+ro=1/(40*IE) //output resistance
+
+
+
+//Results
+printf("Small Signal Voltage Gain = %d\n",av)
+printf("Small Signal Input Resistance is %.1f kOhm\n",(ri/1000))
+printf("Small Signal Output Resistance is %.2f kOhm\n",(ro))
diff --git a/3809/CH18/EX18.11/EX18_11.sce b/3809/CH18/EX18.11/EX18_11.sce
new file mode 100644
index 000000000..041e93433
--- /dev/null
+++ b/3809/CH18/EX18.11/EX18_11.sce
@@ -0,0 +1,30 @@
+//Chapter 18, Example 18.11
+clc
+//Initialisation
+VCC=10 //voltage
+R2=3*10**3 //resistance in ohm
+R1=7*10**3 //resistance in ohm
+RE=10**3 //resistance in ohm
+RC=3*10**3 //resistance in ohm
+VBE=0.7 //base emitter voltage
+av=1 //small sg voltage gain
+RE2=2*10**3 //resistance in ohm
+RC2=4*10**3 //resistance in ohm
+
+
+//Calculation
+VB=VCC*(R2/(R1+R2)) //Quiescent base voltage
+VE=VB-VBE //Quiescent emitter voltage
+IE=VE/RE //Quiescent emitter current
+VC1=VCC-(IE*RC) //Quiescent collector voltage
+VB2=VC1 //bias voltage
+VE2=VB2-VBE //emitter voltage
+IC2=VE2/RE2 //collector current in ampere
+VC2=VCC-(IC2*RC2) //collector voltage
+Av=(-RC/RE)*(-RC2/RE2) //overall gain
+
+
+
+//Results
+printf("Quiescent output voltage = %.1f V\n",VC2)
+printf("Overall Voltage Gain = %d",Av)
diff --git a/3809/CH18/EX18.2/EX18_2.sce b/3809/CH18/EX18.2/EX18_2.sce
new file mode 100644
index 000000000..c78321878
--- /dev/null
+++ b/3809/CH18/EX18.2/EX18_2.sce
@@ -0,0 +1,22 @@
+//Chapter 18, Example 18.2
+clc
+//Initialisation
+Ie=1.02*10**-3
+RB=910*10**3 //resistance in ohm
+hfe=100 //HFE parameter of the transistor
+RC=4.7*10**3 //resistance in ohm
+hoe=10*10**-6 //HOE parameter of the transistor
+
+//Calculation
+gm=40*Ie
+hie=hfe/(40*Ie) //HIE parameter of the transistor
+av=-gm*RC/((hoe*RC)+1) //small signal voltage gain
+ri=(RB*hie)/(RB+hie) //Input Resistance
+a1=1/hoe
+ro=(RC*a1)/(RC+a1) //Output Resistance
+
+
+//Results
+printf("Small Signal Voltage Gain = %d \n",av)
+printf("Input Resistance = %.1f kOhm \n",ri/1000)
+printf("Output Resistance = %.1f kOhm \n",ro/1000)
diff --git a/3809/CH18/EX18.3/EX18_3.sce b/3809/CH18/EX18.3/EX18_3.sce
new file mode 100644
index 000000000..89d255e45
--- /dev/null
+++ b/3809/CH18/EX18.3/EX18_3.sce
@@ -0,0 +1,28 @@
+//Chapter 18, Example 18.3
+clc
+//Initialisation
+VCC=10 //voltage
+R2=10*10**3 //resistance in ohm
+R1=27*10**3 //resistance in ohm
+RE=1*10**3 //resistance in ohm
+RC=2.2 //resistance in ohm
+VBE=0.7 //base emitter voltage
+
+
+
+//Calculation
+VB=VCC*(R2/(R1+R2)) //Quiescent base voltage
+VE=VB-VBE //Quiescent emitter voltage
+IE=VE/RE //Quiescent emitter current
+IC=IE //Quiescent collector current
+VO=VCC-(IC*RC) //Quiescent collector voltage
+
+
+
+
+//Results
+printf("Quiescent base voltage = %.2f V\n",VB)
+printf("Quiescent emitter voltage = %d V\n",VE)
+printf("Quiescent emitter current = %d mA\n",IE*1000)
+printf("Quiescent collector current = %d mA\n",IC*1000)
+printf("Quiescent collector voltage = %.1f V\n",VO) //wrong answer on textbook
diff --git a/3809/CH18/EX18.4/EX18_4.sce b/3809/CH18/EX18.4/EX18_4.sce
new file mode 100644
index 000000000..c01a960e8
--- /dev/null
+++ b/3809/CH18/EX18.4/EX18_4.sce
@@ -0,0 +1,13 @@
+//Chapter 18, Example 18.4
+clc
+//Initialisation
+RE=1.2*10**3 //resistance in ohm
+RC=2.2*10**3 //resistance in ohm
+
+
+//Calculation
+av=-RC/RE //voltage gain
+
+
+//Results
+printf("Voltage gain = %.1f ",av) //wrong answer in the textbook
diff --git a/3809/CH18/EX18.6/EX18_6.sce b/3809/CH18/EX18.6/EX18_6.sce
new file mode 100644
index 000000000..4a2971847
--- /dev/null
+++ b/3809/CH18/EX18.6/EX18_6.sce
@@ -0,0 +1,30 @@
+//Chapter 18, Example 18.6
+clc
+//Initialisation
+vcc=15 //voltage
+vc=9.5 //voltage
+ic=10**-3 //collector current
+Ie=10**-3 //emitter current
+RE=5.6*10**3 //resistance in ohm
+RC=1.3*10**3 //resistance in ohm
+R2=13*10**3 //resistance in ohm, choosen R2 as approximately 10 times RE
+pi=3.14 //pi
+fc=10 //frequency in hertz
+
+
+//Calculation
+rc=(vcc-vc)/ic //resistance in ohm
+re=rc/4 //resistance in ohm
+vg=-RC/(RE+re) //voltage gain
+R1=(R2*(vcc-2))/2 //resistance in ohm
+Ri=(R1*R2)/(R1+R2) //input resistance in ohm
+c=1/(2*pi*fc*Ri) //cut-off frequency
+
+
+
+//Results
+printf("C = %.1f uF\n",c*10**6)
+printf("R1 = %.1f kOhm\n",R1/10**3)
+printf("R2 = %d kOhm\n",R2/10**3)
+printf("RC = %.1f kOhm\n",rc/10**3)
+printf("RE = %.1f kOhm\n",re/10**3)
diff --git a/3809/CH18/EX18.7/EX18_7.sce b/3809/CH18/EX18.7/EX18_7.sce
new file mode 100644
index 000000000..fbd0af61c
--- /dev/null
+++ b/3809/CH18/EX18.7/EX18_7.sce
@@ -0,0 +1,27 @@
+//Chapter 18, Example 18.7
+clc
+//Initialisation
+vcc=15 //voltage
+RC=5.6*10**3 //resistance in ohm
+RE=1.3*10**3 //resistance in ohm
+R2=13*10**3 //resistance in ohm,
+R1=82*10**3 //resistance in ohm
+pi=3.14 //pi
+fc=10 //frequency in hertz
+VBE=0.7 //base to emitter voltage
+
+//Calculation
+VB=vcc*(R2/(R1+R2)) //Quiescent base voltage
+VE=VB-VBE //Quiescent emitter voltage
+IE=VE/RE //Quiescent emitter current
+IC=IE //Quiescent collector current
+VO=vcc-(IC*RC) //Quiescent collector voltage
+
+
+
+//Results
+printf("Quiescent base voltage = %.2f V\n",VB)
+printf("Quiescent emitter voltage = %.2f V\n",VE)
+printf("Quiescent emitter current = %.2f mA\n",IE*1000)
+printf("Quiescent collector current = %.2f mA\n",IC*1000)
+printf("Quiescent collector voltage = %.1f V\n",VO)
diff --git a/3809/CH18/EX18.8/EX18_8.sce b/3809/CH18/EX18.8/EX18_8.sce
new file mode 100644
index 000000000..5331dcb1d
--- /dev/null
+++ b/3809/CH18/EX18.8/EX18_8.sce
@@ -0,0 +1,40 @@
+//Chapter 18, Example 18.8
+clc
+//Initialisation
+vcc=15 //voltage
+RC=5.6*10**3 //resistance in ohm
+RE=1.3*10**3 //resistance in ohm
+R2=13*10**3 //resistance in ohm,
+R1=82*10**3 //resistance in ohm
+pi=3.14 //pi
+fc=10 //frequency in hertz
+VBE=0.7 //base to emitter voltage
+hfe1=100
+hfe2=400
+
+//Calculation
+VB=vcc*(R2/(R1+R2)) //Quiescent base voltage
+VE=VB-VBE //Quiescent emitter voltage
+IE=VE/RE //Quiescent emitter current
+IC=IE //Quiescent collector current
+VO=vcc-(IC*RC) //Quiescent collector voltage
+
+re=1/(40*IE)
+av=-RC/re //voltage gain
+rp=(R1*R2)/(R1+R2)
+
+//if hfe=100
+hie1=hfe1*re
+ri1=(rp*hie1)/(rp+hie1)
+
+//if hfe=400
+hie2=hfe2*re
+ri2=(rp*hie2)/(rp+hie2)
+
+ro=RC
+
+//Results
+printf("Small Signal Voltage Gain = %d\n",av)
+printf("Small Signal Input Resistance is %d kOhm to %.1f kOhm\n",round(ri1/1000),(ri2/1000))
+printf("Small Signal Output Resistance is %.1f kOhm\n",(RC/1000))
+
diff --git a/3809/CH18/EX18.9/EX18_9.sce b/3809/CH18/EX18.9/EX18_9.sce
new file mode 100644
index 000000000..4431f5612
--- /dev/null
+++ b/3809/CH18/EX18.9/EX18_9.sce
@@ -0,0 +1,20 @@
+//Chapter 18, Example 18.9
+clc
+//Initialisation
+R1=2*10**3 //resistance in ohm
+R2=5.2*10**3 //resistance in ohm
+pi=3.14 //pi
+c=2.2*10**-6 //capacitance in farad
+ce=10*10**-6 //capacitance in farad
+re=24 //resistance in ohm
+
+//Calculation
+fc1=1/(2*pi*c*R1) //cut-off frequency
+
+fc2=1/(2*pi*c*R2) //cut-off frequency
+
+fc=1/(2*pi*ce*re) //cut-off frequency
+
+//Results
+printf("Coupling Capacitor is in the range %d Hz - %d Hz\n",round(fc2),round(fc1))
+printf("Decoupling Capacitor, Ce = %d Hz",fc)
generated by cgit (git 2.34.1) at 2024-12-19 18:14:03 +0000