Homework Answers
The feedback circuit becomes, as shown above, assuming the input impedance of the transresistance amplifier is 0.
Feedback,
In the frequency domain,
So to satisfy Barkhausen criteria, the phase of feedback must be zero. Hence
Which is the oscillating frequency.
And for the oscillations to sustain, loop gain A*beta >1. Hence,
At the oscillation frequency,
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4. For the oscillator circuit shown below, the amplifier is an with trans-resistance gain Rm Vo frequency of oscillator and minimum trans-resistance gan (15pts) (Hint: ideal tr short the input te...
Can you solve this exercise? I) 20pts Given the following circuit oscillator. Assume an ideal Op Amp. R1 Vo Cl Vf R2 C2...
Can you solve this exercise?
I) 20pts Given the following circuit oscillator. Assume an ideal Op Amp. R1 Vo Cl Vf R2 C2 R' I) a-What is the nature of this oscillator b- Identify on the circuit the amplifier circuit and the feedback circuit. 2) a- Express the gain of the amplifier A -Vo/Vf b- Express the feedback fraction B Vf/Vo -e-Find and draw the modulus and phase angle of B in terms of ω 3) a- Write the oscillation...
Problem 1130 pts 1. [12 pts] For the circuit shown in Fig. 1, istance Rm when the switch is open. What type of voltage gain Vo/Vin and the input resistance Rin when the switch is close. What type of...
Problem 1130 pts 1. [12 pts] For the circuit shown in Fig. 1, istance Rm when the switch is open. What type of voltage gain Vo/Vin and the input resistance Rin when the switch is close. What type of a) Find the voltage gain val vin and the input resistance Rin when the switch is open b) Find the amplifier is this? amplifier is this? tin vo R Fig. 1 [18 pts] Design a circuit that implements the following: Vo(t)...
Consider the oscillator circuit shown below. The op amp i s ideal Rb Vo R2 = 10 kΩ L2 100 mH R1 1...
Consider the oscillator circuit shown below. The op amp i s ideal Rb Vo R2 = 10 kΩ L2 100 mH R1 1 k2 L1 = 10 mH a. What is the frequency of oscillation in Hz? b. Specify the required value of Rb sustain oscillations. c. A limiter circuit is added to oscillator by separating Rb into two series resistors Rb1 and Rb2 as shown in the next page along with two anti-parallel diodes in shunt with Rb2. determine...
TE Question 5 (20 marks) An active filter circuit is shown in Fig. 4. The cut-off frequency of this active filter is...
TE Question 5 (20 marks) An active filter circuit is shown in Fig. 4. The cut-off frequency of this active filter is 1590Hz. The Input impedance and voltage gain of this filter are 10k0 and -5VN respectively Vout R1 vin R2 C1 Fig. 4 By assuming the operational amplifier, A is ideal, answer the following questions: (a) () State the type of this active fiter. (i) Explain the characteristic of this active filter. [2 marks] 3 marks] (b) 0) Calculate...
A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm-60 mS (equivalent to mA/ V) and drain source resistance, os,...
A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm-60 mS (equivalent to mA/ V) and drain source resistance, os, is so large it may be neglected. 0) Calculate the open circuit voltage gain Av Yout/ Vis. i) The amplifier has a load of 10 k2. Determine the current gain Va. = 12 V 150k 4k3 Vout Vin 200k GND = 0 V Figure 4b a) State the name...
Can you solve this exercise?
I) 20pts Given the following circuit oscillator. Assume an ideal Op Amp. R1 Vo Cl Vf R2 C2 R' I) a-What is the nature of this oscillator b- Identify on the circuit the amplifier circuit and the feedback circuit. 2) a- Express the gain of the amplifier A -Vo/Vf b- Express the feedback fraction B Vf/Vo -e-Find and draw the modulus and phase angle of B in terms of ω 3) a- Write the oscillation...
Problem 1130 pts 1. [12 pts] For the circuit shown in Fig. 1, istance Rm when the switch is open. What type of voltage gain Vo/Vin and the input resistance Rin when the switch is close. What type of a) Find the voltage gain val vin and the input resistance Rin when the switch is open b) Find the amplifier is this? amplifier is this? tin vo R Fig. 1 [18 pts] Design a circuit that implements the following: Vo(t)...
Consider the oscillator circuit shown below. The op amp i s ideal Rb Vo R2 = 10 kΩ L2 100 mH R1 1 k2 L1 = 10 mH a. What is the frequency of oscillation in Hz? b. Specify the required value of Rb sustain oscillations. c. A limiter circuit is added to oscillator by separating Rb into two series resistors Rb1 and Rb2 as shown in the next page along with two anti-parallel diodes in shunt with Rb2. determine...
TE Question 5 (20 marks) An active filter circuit is shown in Fig. 4. The cut-off frequency of this active filter is 1590Hz. The Input impedance and voltage gain of this filter are 10k0 and -5VN respectively Vout R1 vin R2 C1 Fig. 4 By assuming the operational amplifier, A is ideal, answer the following questions: (a) () State the type of this active fiter. (i) Explain the characteristic of this active filter. [2 marks] 3 marks] (b) 0) Calculate...
A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm-60 mS (equivalent to mA/ V) and drain source resistance, os, is so large it may be neglected. 0) Calculate the open circuit voltage gain Av Yout/ Vis. i) The amplifier has a load of 10 k2. Determine the current gain Va. = 12 V 150k 4k3 Vout Vin 200k GND = 0 V Figure 4b a) State the name...
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