65. The figure shows an opamp circuit with a 5.1 V Zener diode in the feedback loop. The opamp runs from \( \pm 15 \mathrm{~V} \) supplies. If a \( +1 V \) signal is applied at the input, the output voltage (rounded off to one decimal place) is 4 ANSWER KEY \begin{tabular}{|c|c|c|c|} \hline 1. & (d) & 2. & (d) \\ \hline 3. & (c) & 4. & (a) \\ \hline 5. & (b) & 6. & (b) \\ \hline 7. & (c) & 8. & (a) \\ \hline 9. & (b) & 10 & (b) \\ \hline \end{tabular}
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The presence of a Zener diode in the feedback loop suggests that the circuit is likely a voltage regulator or a precision voltage reference circuit. The Zener diode will maintain a constant voltage across it when it is in the breakdown region. Show more…
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Q1) [10 marks: CLO 1] Circle the correct answer: 1) Which of the following characteristics does not necessarily apply to an op-amp? (a) High gain (b) Low power (c) High input impedance (d) Low output impedance 2) When an op-amp is operated in the single-ended differential mode, (a) the output is grounded (b) one input is grounded and a signal is applied to the other (c) both inputs are connected together (d) the output is not inverted 3) Common-mode gain is (a) very high (b) very low (c) always unity (d) unpredictable 4) The most realistic value for open-loop gain of an op-amp of the values listed is (a) 1 dB (b) 2000 dB (c) 80 dB (d) 100,000 dB 5) For an op-amp with negative feedback, the output is (a) equal to the input (b) increased (c) fed back to the inverting input (d) fed back to the noninverting input
Adi S.
Problem 1 Op-Amps Application (35 points) Q1. For circuit shown in Figure 1a, assume that the Op-Amp is ideal and connected to +15 and -15 power supplies. If the input V+ is the sine wave shown in Figure 1b, and input V- is connected to a constant 2 V battery. a) (4 Points) Give the equation to calculate the output voltage: Vo= b) (7 points) Draw the waveform for the output Vo in the given squared area showing the values of voltage and time in the graph, if not possible to use this graph then draw your own on a piece of paper.
a) Find vo in the circuit shown if va =0.1V and vb =0.25V b) If vb =0.25V how large can va be before the op amp saturates? c) If va =0.1V how large can Vb be before the op amp saturates? d) Repeat (a), (b), and (c) with the polarity of vb reversed.
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