summaryrefslogtreecommitdiff
path: root/3754/CH29
diff options
context:
space:
mode:
Diffstat (limited to '3754/CH29')
-rw-r--r--3754/CH29/EX29.1/29_1.sce14
-rw-r--r--3754/CH29/EX29.11/29_11.sce19
-rw-r--r--3754/CH29/EX29.14/29_14.sce18
-rw-r--r--3754/CH29/EX29.15/29_15.sce23
-rw-r--r--3754/CH29/EX29.16/29_16.sce31
-rw-r--r--3754/CH29/EX29.2/29_2.sce14
-rw-r--r--3754/CH29/EX29.3/29_3.sce14
-rw-r--r--3754/CH29/EX29.4/29_4.sce17
-rw-r--r--3754/CH29/EX29.5/29_5.sce15
-rw-r--r--3754/CH29/EX29.6/29_6.sce18
-rw-r--r--3754/CH29/EX29.7/29_7.sce15
-rw-r--r--3754/CH29/EX29.8/29_8.sce17
-rw-r--r--3754/CH29/EX29.9/29_9.sce19
13 files changed, 234 insertions, 0 deletions
diff --git a/3754/CH29/EX29.1/29_1.sce b/3754/CH29/EX29.1/29_1.sce
new file mode 100644
index 000000000..adc28dfd8
--- /dev/null
+++ b/3754/CH29/EX29.1/29_1.sce
@@ -0,0 +1,14 @@
+clear//
+
+//Variables
+
+Av = 400.0 //Voltage gain
+beta = 0.1 //feedback ratio
+
+//Calculation
+
+A1v = Av / (1 + beta * Av) //Voltage gain with negative feedback
+
+//Result
+
+printf("\n The voltage gain of an amplifier with negative feedback is %0.2f .",A1v)
diff --git a/3754/CH29/EX29.11/29_11.sce b/3754/CH29/EX29.11/29_11.sce
new file mode 100644
index 000000000..cda25545b
--- /dev/null
+++ b/3754/CH29/EX29.11/29_11.sce
@@ -0,0 +1,19 @@
+clear//
+
+//Variables
+
+Rin = 4.2 * 10**3 //Input resistance (in ohm)
+Av = 220.0 //Voltage gain without feedback
+beta = 0.01 //Feedback ratio
+f1 = 1.5 * 10**3 //Cut off frequency without feedback (in Hertz)
+f2 = 501.5 * 10**3 //Cut off frequency with feedback (in Hertz)
+
+//Calculation
+
+R1i = (1 + beta * Av) * Rin //Input resistance of feedback amplifier (in ohm)
+f11 = f1 / (1 + beta * Av) //New cut off frequency without feedback (in Hertz)
+f21 = (1 + beta * Av) * f2 //New cut off frequency with feedback (in Hertz)
+
+//Result
+
+printf("\n The value of input resistance with feedback is %0.3f kilo-ohm.\nNew cut off frequency without feedback is %0.0f Hz.\nNew cut off frequency with feedback is %0.3f kHz.",R1i*10**-3,f11,f21*10**-3)
diff --git a/3754/CH29/EX29.14/29_14.sce b/3754/CH29/EX29.14/29_14.sce
new file mode 100644
index 000000000..8a7a15174
--- /dev/null
+++ b/3754/CH29/EX29.14/29_14.sce
@@ -0,0 +1,18 @@
+clear//
+
+//Variables
+
+Av = 300.0 //Voltage gain without feedback
+Ri = 1.5 * 10**3 //Input resistance (in ohm)
+Ro = 50.0 * 10**3 //Output resistance (in ohm)
+beta = 1.0/15.0 //feedback ratio
+
+//Calculation
+
+A1v = Av/ (1 + beta*Av) //Voltage gain with feedback
+R1i = (1 + beta* Av)* Ri //Input resistance with feedback (in ohm)
+R1o = Ro/(1 + beta * Av) //Output resistance with feedback (in ohm)
+
+//Result
+
+printf("\n Voltage gain with feedback is %0.1f .\nInput resistance with feedback is %0.3f kilo-ohm.\nOutput resistance with feedback is %0.1f kilo-ohm.",A1v,R1i*10**-3,R1o*10**-3)
diff --git a/3754/CH29/EX29.15/29_15.sce b/3754/CH29/EX29.15/29_15.sce
new file mode 100644
index 000000000..614e87eac
--- /dev/null
+++ b/3754/CH29/EX29.15/29_15.sce
@@ -0,0 +1,23 @@
+clear//
+
+//Variables
+
+hfe = 100.0 //hfe
+hie = 2.0 * 10**3 //hie (in ohm)
+Re1 = 100.0 //Emitter resistance (in ohm)
+R1 = 15.0 * 10**3 //Resistance (in ohm)
+R2 = 5.6 * 10**3 //Resistance (in ohm)
+Rc = 470.0 //Collector resistance (in ohm)
+
+//Calculation
+
+Ai = hfe //Current gain
+Av = Ai * Rc / hie //Voltage gain
+Ri = (R1*R2*hie)/(R1*R2+R2*hie+R1*hie) //Input resistance (in ohm)
+beta = Re1 / Rc //feedback ratio
+A1v = Av / (1 + beta * Av) //Voltage ratio with feedback
+R1i = Ri*(1 + beta * Av) //Input resistancewith feedback (in ohm)
+
+//Result
+
+printf("\n Voltage gain without feedback is %0.3f .\nInput resistance without feedback is %0.0f kilo-ohm.\nVoltage gain with feedback is %0.2f .\nInput resistance with feedback is %0.1f kilo-ohm.",Av,Ri,A1v,R1i)
diff --git a/3754/CH29/EX29.16/29_16.sce b/3754/CH29/EX29.16/29_16.sce
new file mode 100644
index 000000000..490fd1d52
--- /dev/null
+++ b/3754/CH29/EX29.16/29_16.sce
@@ -0,0 +1,31 @@
+clear//
+
+//Variables
+
+hfe = 99.0 //hfe
+hie = 2.0 * 10**3 //hie (in ohm)
+Rc = 22.0 * 10**3 //Load resistor of frist stage (in ohm)
+R4 = 100.0 //Emitter resistance of first stage (in ohm)
+R1 = 220.0 * 10**3 //Biasing resistor of second stage (in ohm)
+R2 = 22.0 * 10**3 //Biasing resistor of second stage (in ohm)
+R1c = 4.7 * 10**3 //Load resistance of second stage (in ohm)
+R3 = 7.8 * 10**3 //Feedback resistor from collector of second stage to emitter of first stage (in ohm)
+
+//Calculation
+
+Ri = hie //Input resistance of first stage (in ohm)
+Ro1 = (1/Rc + 1/R1 + 1/R2 + 1/hie)**-1 //Output resistance of first stage (in ohm)
+Ri2 = hie //Input resistance of second stage (in ohm)
+Ro2 = R1c * (R3 + R4)/(R1c + R3 + R4) //Output resistance of second stage (in ohm)
+Av1 = hfe * Ro1 / hie //Voltage gain of first stage
+Av2 = hfe * Ro2 / hie //Voltage gain of second stage
+Av = Av1 * Av2 //Overall voltage gain without feedback
+beta = R4 / (R3 + R4) //Feedback ratio
+Ri1 = Ri*(1 + beta*Av) //Input resistance with feedback (in ohm)
+R1o2 = Ro2 / (1 + beta * Av) //Output resistance with feedback (in ohm)
+A1v = Av / (1 + beta * Av) //Overall voltage gain with feedback
+
+//Result
+
+printf("\n Voltage gain without feedback is %0.1f .\nInput resistance of first stage without feedback is %0.3f kilo-ohm.\nInput resistance of second stage without feedback is %0.3f kilo-ohm.\nOutput resistance of first stage without feedback is %0.2f kilo-ohm.\nOutput resistance of second stage without feedback is %0.2f kilo-ohm .",Av,Ri*10**-3,Ri2*10**-3,Ro1*10**-3,Ro2*10**-3)
+printf("\n Voltage gain with feedback is %0.1f .\nInput resistance with feedback is %0.2f kilo-ohm.\nOutput resistance with feedback is %0.3f kilo-ohm.",A1v,Ri1*10**-3,R1o2*10**-3)
diff --git a/3754/CH29/EX29.2/29_2.sce b/3754/CH29/EX29.2/29_2.sce
new file mode 100644
index 000000000..3e2822d65
--- /dev/null
+++ b/3754/CH29/EX29.2/29_2.sce
@@ -0,0 +1,14 @@
+clear//
+
+//Variables
+
+Av = 100.0 //Voltage gain
+A1v = 20.0 //Voltage gain with negative feedback
+
+//Calculation
+
+beta = (Av/A1v - 1) / Av //feedback ratio
+
+//Result
+
+printf("\n The percentage of the negative feedback is %0.3f",beta * 100)
diff --git a/3754/CH29/EX29.3/29_3.sce b/3754/CH29/EX29.3/29_3.sce
new file mode 100644
index 000000000..963b16fbe
--- /dev/null
+++ b/3754/CH29/EX29.3/29_3.sce
@@ -0,0 +1,14 @@
+clear//
+
+//Variables
+
+Av = 1000.0 //Voltage gain
+A1v = 10.0 //Voltage gain with negative feedback
+
+//Calculation
+
+beta = (Av/A1v - 1) / Av //feedback ratio
+
+//Result
+
+printf("\n The fraction of the output that is feedback to the input is %0.3f .",beta)
diff --git a/3754/CH29/EX29.4/29_4.sce b/3754/CH29/EX29.4/29_4.sce
new file mode 100644
index 000000000..83ff84a99
--- /dev/null
+++ b/3754/CH29/EX29.4/29_4.sce
@@ -0,0 +1,17 @@
+clear//
+
+//Variables
+
+V1o=12.5;Vo=12.5;
+V1in = 1.5 //Input voltage with feedback (in volts)
+Vin = 0.25 //Input voltage without feedback (in volts)
+
+//Calculation
+
+Av = Vo / Vin //Voltage gain without negative feedback
+A1v = V1o / V1in //Voltage gain with negative feedback
+beta = (Av/A1v - 1) / Av //feedback ratio
+
+//Result
+
+printf("\n The value of voltage gain without negative feedback is %0.3f .\nThe value of voltage gain with negative feedback is %0.2f .\nThe value of beta is %0.3f .",Av,A1v,beta)
diff --git a/3754/CH29/EX29.5/29_5.sce b/3754/CH29/EX29.5/29_5.sce
new file mode 100644
index 000000000..b43ef2c8f
--- /dev/null
+++ b/3754/CH29/EX29.5/29_5.sce
@@ -0,0 +1,15 @@
+clear//
+
+//Variables
+
+Av = 60.0 //Voltage gain
+A1v = 80.0 //Voltage gain with negative feedback
+
+//Calculation
+
+beta = (1 - Av/A1v ) / Av //feedback ratio
+beta1 = 1/Av //feedback ratio which causes oscillation
+
+//Result
+
+printf("\n Value of feedback ratio is %0.3f .\nThe percentage of feedback which causes oscillation is %0.1f percentage.",beta,beta1*100)
diff --git a/3754/CH29/EX29.6/29_6.sce b/3754/CH29/EX29.6/29_6.sce
new file mode 100644
index 000000000..9dc3ff0b2
--- /dev/null
+++ b/3754/CH29/EX29.6/29_6.sce
@@ -0,0 +1,18 @@
+clear//
+
+//Variables
+
+A1v = 100.0 //Voltage gain with negative feedback
+Vin = 50.0 * 10**-3 //Input voltage without feedback (in volts)
+V1in = 0.6 //Input voltage with feedback (in volts)
+
+//Calculation
+
+V1o = A1v * V1in //Output voltage with feedback (in volts)
+Vo = V1o //Output voltage without feedback (in volts)
+Av = Vo / Vin //Voltage gain without feedback
+beta = (Av/A1v - 1) / Av //feedback ratio
+
+//Result
+
+printf("\n The value of voltage gain without feedback is %0.3f .\nThe value of voltage gain with feedback is %0.3f .",Av,A1v)
diff --git a/3754/CH29/EX29.7/29_7.sce b/3754/CH29/EX29.7/29_7.sce
new file mode 100644
index 000000000..c657eb167
--- /dev/null
+++ b/3754/CH29/EX29.7/29_7.sce
@@ -0,0 +1,15 @@
+clear//
+
+//Variables
+
+Av = 800.0 //Voltage gain
+beta = 0.05 //Feedback ratio
+dAvbyAv = 20.0 //Percentage change in open loop gain
+
+//Calculation
+
+dA1vbyA1v = 1 / (1 + beta*Av)*dAvbyAv //Percentage change in closed loop gain
+
+//Result
+
+printf("\n The percentage change in closed loop gain is %0.1f percentage.",dA1vbyA1v)
diff --git a/3754/CH29/EX29.8/29_8.sce b/3754/CH29/EX29.8/29_8.sce
new file mode 100644
index 000000000..a6f0d9a31
--- /dev/null
+++ b/3754/CH29/EX29.8/29_8.sce
@@ -0,0 +1,17 @@
+clear//
+
+//Variables
+
+A1v = 100.0 //Voltage gain with feedback
+dA1vbyA1v = 0.01 //Percentage change in closed loop gain
+dAvbyAv = 0.20 //Percentage change in open loop gain
+
+//Calculation
+
+betamultAvplus1 = dAvbyAv/dA1vbyA1v //Product of feedback ratio and voltage ratio plus one
+Av = A1v * betamultAvplus1 //Voltage gain without feedback
+beta = betamultAvplus1 / Av //Feedback ratio
+
+//Result
+
+printf("\n The value of Av is %0.3f .\nThe value of beta is %0.3f .",Av,beta)
diff --git a/3754/CH29/EX29.9/29_9.sce b/3754/CH29/EX29.9/29_9.sce
new file mode 100644
index 000000000..18a83e782
--- /dev/null
+++ b/3754/CH29/EX29.9/29_9.sce
@@ -0,0 +1,19 @@
+clear//
+
+//Variables
+
+Av = 100.0 //Voltage gain without feedback
+BW = 200.0 * 10**3 //Bandwidth without feedback (in Hertz)
+beta = 0.05 //Feedback ratio
+BWn = 1.0 * 10**6 //New bandwidth without feedback (in Hertz)
+
+//Calculation
+
+BW1 = (1 + beta*Av) * BW //Bandwidth with feedback (in Hertz)
+A1v = Av/(1 + beta*Av) //Voltage gain with feedback
+beta1 = (BWn/BW - 1)/Av //Amount of feedback required
+
+//Result
+
+printf("\n The new bandwidth is %0.3f kHz.\nThe new gain is %0.1f .",BW1*10**-3,A1v)
+printf("\n Amout of feedback required when BW = 1MHz is %0.3f percentage.",beta1 * 100)
generated by cgit (git 2.34.1) at 2024-12-19 12:34:21 +0000