Sd292 Asg4
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SYDE 292
Sample Exam Questions
#4
Questions: 1. For the circuit shown below left, obtain Vo for sinusoidal Vi. State any assumptions. Sketch Vo versus Vi for Vi having a 5 V peak to peak value and a frequency of 100 Hz.
2. Consider the super diode circuit shown above right. Add a second diode shunting the first but with opposite polarity. Sketch the transfer characteristics of the revised circuit. On the same graph sketch the transfer characteristics from the input to the output of the op-amp. Assume that the diodes used have a constant .7V drop when conducting. 3. Consider the super diode circuit shown below left. Add a second resistor and determine a suitable output point such that Vo = 2 Vi for Vi > 0 .
4. Modifiy the circuit shown above right by connecting the positive op-amp terminal to a voltage V1. Sketch the transfer characteristics of the resulting circuit for a) V1 = -1 V b) V1 = 1 V Assume that R1 = R2 5. Consider the Schmitt trigger comparator circuit shown below. For an op-amp which saturates at +/- 13 V and R1 = 1 MΩ , find the value of R2 that results in thresholds of +/- 1.3 V.
6. Augment the Schmitt trigger comparator circuit shown below left by adding a resistor R3, connected from the common node of R1 and R2 to the negative suppy (-VDC).
For an op-amp powered by +/- VDC which saturates at (VDC - 2) and (-VDC + 2) design a comparator with thresholds at 0 and .1 VDC. Use R1 = 10 kΩ and VDC = 15 V
7. For the circuit shown above right sketch the transfer characteristics Vo versus Vi. Assume the diodes used have a constant 0.7V drop when conducting and the amplifier saturates at +/12 V. 8. Modify the circuit of question 7 such that it has thresholds of +/- 0.7 V and uses only one op-amp, a single resistor and two diodes. 9. Sketch the log magnitude curve for the following transfer function.
Vo − 50ω c = Vi s + ωc
where ω c = 6666 rad /s Design a circuit which realizes this transfer function. 10. Design a difference amplifier with a gain of 3 and a differential input resistance of 100 KΩ
Sample Exam Questions
#4
Questions: 1. For the circuit shown below left, obtain Vo for sinusoidal Vi. State any assumptions. Sketch Vo versus Vi for Vi having a 5 V peak to peak value and a frequency of 100 Hz.
2. Consider the super diode circuit shown above right. Add a second diode shunting the first but with opposite polarity. Sketch the transfer characteristics of the revised circuit. On the same graph sketch the transfer characteristics from the input to the output of the op-amp. Assume that the diodes used have a constant .7V drop when conducting. 3. Consider the super diode circuit shown below left. Add a second resistor and determine a suitable output point such that Vo = 2 Vi for Vi > 0 .
4. Modifiy the circuit shown above right by connecting the positive op-amp terminal to a voltage V1. Sketch the transfer characteristics of the resulting circuit for a) V1 = -1 V b) V1 = 1 V Assume that R1 = R2 5. Consider the Schmitt trigger comparator circuit shown below. For an op-amp which saturates at +/- 13 V and R1 = 1 MΩ , find the value of R2 that results in thresholds of +/- 1.3 V.
6. Augment the Schmitt trigger comparator circuit shown below left by adding a resistor R3, connected from the common node of R1 and R2 to the negative suppy (-VDC).
For an op-amp powered by +/- VDC which saturates at (VDC - 2) and (-VDC + 2) design a comparator with thresholds at 0 and .1 VDC. Use R1 = 10 kΩ and VDC = 15 V
7. For the circuit shown above right sketch the transfer characteristics Vo versus Vi. Assume the diodes used have a constant 0.7V drop when conducting and the amplifier saturates at +/12 V. 8. Modify the circuit of question 7 such that it has thresholds of +/- 0.7 V and uses only one op-amp, a single resistor and two diodes. 9. Sketch the log magnitude curve for the following transfer function.
Vo − 50ω c = Vi s + ωc
where ω c = 6666 rad /s Design a circuit which realizes this transfer function. 10. Design a difference amplifier with a gain of 3 and a differential input resistance of 100 KΩ
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