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Q3(a) Explain TWO (2) differences between system with positive feedback and system with negative feedback. (b)...
Circuit Analysis Zo Is Zi ALi If FIGURE Q3(b) negative feedback network (b) Figure Q3(b) shows...
Circuit Analysis
Zo Is Zi ALi If FIGURE Q3(b) negative feedback network (b) Figure Q3(b) shows an amplifier with a Given Zof 100 kQ, Zo = 10 kQ and A 50 State the feedback topology and the amplifier type (i) (2 marks) (ii) Calculate the gain without feedback, A and the feedback factor, B. (6 marks) (iii) If the low cutoff frequency of the amplifier with feedback network (fL) is 300 Hz, calculate the low cutoff frequency (fi) if the...
4 a) List the advantages and disadvantages of using negative feedback in electronic systems b) Draw...
4 a) List the advantages and disadvantages of using negative feedback in electronic systems b) Draw a block diagram of an amplifier with feedback, labelling clearly the open loop gain Aol and feedback fraction, ?. Show that the gain with feedback is given by Under what conditions is the closed loop gain insensitive to variations in the open loop gain? c) Identify the feedback topology of the amplifier shown in Figure Q6c and hence the amplifier type. Represent the circuit...
Problem 2 2 The following Amplifier circuit (see Fig.2) has feedback Is this negative feedback? Explain. a. b. Calculate the closed loop gain at low frequencies (neglect capacitances)C hcom) c. W...
Problem 2 2 The following Amplifier circuit (see Fig.2) has feedback Is this negative feedback? Explain. a. b. Calculate the closed loop gain at low frequencies (neglect capacitances)C hcom) c. What is the input impedance of the amplifier? (porralel p very smau t in mpedente Nonit 白い2 Fig.2: Feedback amplifier
Problem 2 2 The following Amplifier circuit (see Fig.2) has feedback Is this negative feedback? Explain. a. b. Calculate the closed loop gain at low frequencies (neglect capacitances)C hcom) c....
1. The feedback is negative. True or False? 2. Find the value of the forward amplifier...
1. The feedback is negative. True or
False?
2. Find the value of the forward amplifier gain
3. If R1=10kΩ, what value should R2 have to have a feedback
factor of 1/2?
4. The closed-loop gain is about …
(Hint: The closed-loop gain is positive)
A) 1.5
B) 2.8
C) 1.9
D) 3.7
5) If the overall forward amplifier has a 150 Hz bandwidth (due
to a single dominant pole), the bandwidth of the closed-loop
circuit would be around …...
A positive-feedback closed-loop system is subjected to an input voltage of 1V dc. Assuming the forward...
A positive-feedback closed-loop system is subjected to an input voltage of 1V dc. Assuming the forward path gain of 1 and a feedback path gain of 0.5 Sketch the block diagram of the system. Deduce the signal flow diagram of the system Determine the output voltage
A unity gain negative feedback system has an open-loop transfer function given by 4. s) =...
A unity gain negative feedback system has an open-loop transfer function given by 4. s) = s(1 + 10s)(1 + 10s)? Draw a Bode diagram for this system and determine the loop gain K required for a phase margin of 20 deg. What is the gain margin? 5. We are given the closed-loop transfer function 10(s + 1) T(s) = 82+98+10 for a "unity feedback" system and asked to find the open-loop transfer function, generate a log-magnitude-phase plot for both...
4. In the circuit shown below, a parallel RC network creates a frequency-dependent feedback path ...
4. In the circuit shown below, a parallel RC network creates a frequency-dependent feedback path for the inverting amplifier block with gain Av (a large negative value). Use the Miller theorem to find the equivalent input impedance Zin as indicated in the diagram and then show that Vin/Vsig is given by the symbolic expression shown below right. Choose a value for capacitor C to make the upper cut-off frequency fH equal to 22 kHz. Repeat the calculation for the case...
QUESTION 2 Given that a control system has a forward path of G(s) and negative unity...
QUESTION 2 Given that a control system has a forward path of G(s) and negative unity feedback and unit- step input is applied to the system. If G(s) is given as: K G(s)= s(s4) Draw the block diagram of the system. a) Derive the closed-loop transfer function of the system. b) If the gain K 6, determine the settling time of the resulting second-order system at 2% c) tolerance band Its corresponding steady state error. d) Sketch the controlled output...
Problem 52: (25 points) Operational amplifiers are important building blocks in a wide spectrum of electronic systems such as amplifiers and filters. The concept of feedback control is of central imp...
Problem 52: (25 points) Operational amplifiers are important building blocks in a wide spectrum of electronic systems such as amplifiers and filters. The concept of feedback control is of central importance in understanding the design of operational amplifier circuits. For without feedback, operational amplifiers behave as comparators. This problem shows why it is necessary to connect the output of an operational amplifier to its inverting input. Negative feedback produces a circuit that is BIBO stable. Figure 1(A) shows the circuit...
Please explain part b and C in detail. Figure 6 shows a feedback control system for...
Please explain part b and C in detail.
Figure 6 shows a feedback control system for which G(s) = 6 (s + 1)3 J' and K(s) is the transfer function of a compensator. (a) Sketch the Nyquist diagram of G(s) evaluating the real-axis intercepts and their corre- sponding frequencies. [10 marks] (b) Show that the closed-loop system will oscillate at frequency w = V3 rad s-1 when the closed-loop gain is K = ? (5 marks] (c) Design a proportional-derivative...
Circuit Analysis
Zo Is Zi ALi If FIGURE Q3(b) negative feedback network (b) Figure Q3(b) shows an amplifier with a Given Zof 100 kQ, Zo = 10 kQ and A 50 State the feedback topology and the amplifier type (i) (2 marks) (ii) Calculate the gain without feedback, A and the feedback factor, B. (6 marks) (iii) If the low cutoff frequency of the amplifier with feedback network (fL) is 300 Hz, calculate the low cutoff frequency (fi) if the...
4 a) List the advantages and disadvantages of using negative feedback in electronic systems b) Draw a block diagram of an amplifier with feedback, labelling clearly the open loop gain Aol and feedback fraction, ?. Show that the gain with feedback is given by Under what conditions is the closed loop gain insensitive to variations in the open loop gain? c) Identify the feedback topology of the amplifier shown in Figure Q6c and hence the amplifier type. Represent the circuit...
Problem 2 2 The following Amplifier circuit (see Fig.2) has feedback Is this negative feedback? Explain. a. b. Calculate the closed loop gain at low frequencies (neglect capacitances)C hcom) c. What is the input impedance of the amplifier? (porralel p very smau t in mpedente Nonit 白い2 Fig.2: Feedback amplifier
Problem 2 2 The following Amplifier circuit (see Fig.2) has feedback Is this negative feedback? Explain. a. b. Calculate the closed loop gain at low frequencies (neglect capacitances)C hcom) c....
1. The feedback is negative. True or
False?
2. Find the value of the forward amplifier gain
3. If R1=10kΩ, what value should R2 have to have a feedback
factor of 1/2?
4. The closed-loop gain is about …
(Hint: The closed-loop gain is positive)
A) 1.5
B) 2.8
C) 1.9
D) 3.7
5) If the overall forward amplifier has a 150 Hz bandwidth (due
to a single dominant pole), the bandwidth of the closed-loop
circuit would be around …...
A unity gain negative feedback system has an open-loop transfer function given by 4. s) = s(1 + 10s)(1 + 10s)? Draw a Bode diagram for this system and determine the loop gain K required for a phase margin of 20 deg. What is the gain margin? 5. We are given the closed-loop transfer function 10(s + 1) T(s) = 82+98+10 for a "unity feedback" system and asked to find the open-loop transfer function, generate a log-magnitude-phase plot for both...
4. In the circuit shown below, a parallel RC network creates a frequency-dependent feedback path for the inverting amplifier block with gain Av (a large negative value). Use the Miller theorem to find the equivalent input impedance Zin as indicated in the diagram and then show that Vin/Vsig is given by the symbolic expression shown below right. Choose a value for capacitor C to make the upper cut-off frequency fH equal to 22 kHz. Repeat the calculation for the case...
QUESTION 2 Given that a control system has a forward path of G(s) and negative unity feedback and unit- step input is applied to the system. If G(s) is given as: K G(s)= s(s4) Draw the block diagram of the system. a) Derive the closed-loop transfer function of the system. b) If the gain K 6, determine the settling time of the resulting second-order system at 2% c) tolerance band Its corresponding steady state error. d) Sketch the controlled output...
Problem 52: (25 points) Operational amplifiers are important building blocks in a wide spectrum of electronic systems such as amplifiers and filters. The concept of feedback control is of central importance in understanding the design of operational amplifier circuits. For without feedback, operational amplifiers behave as comparators. This problem shows why it is necessary to connect the output of an operational amplifier to its inverting input. Negative feedback produces a circuit that is BIBO stable. Figure 1(A) shows the circuit...
Please explain part b and C in detail.
Figure 6 shows a feedback control system for which G(s) = 6 (s + 1)3 J' and K(s) is the transfer function of a compensator. (a) Sketch the Nyquist diagram of G(s) evaluating the real-axis intercepts and their corre- sponding frequencies. [10 marks] (b) Show that the closed-loop system will oscillate at frequency w = V3 rad s-1 when the closed-loop gain is K = ? (5 marks] (c) Design a proportional-derivative...
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