exam1 F05 part 2 - corresponds to waveform B shown below...

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EECS 314 // Winter 2005 // Exam 3 // Solutions Alexander Ganago Page 5 of 25 April 6 – 19, 2005 4 Consider the Schmitt trigger circuit shown on the diagram. The Op Amp saturates at –12 V and at +12 V. The input voltage varies from -12 V to +12 at the rate of 2 V per second, as shown on the sketch below. Which of the following waveforms correctly represents the output voltage? (On each sketch, the dashed line shows the input voltage): = = = Solution From the analytic solution given in HW 09 problem 2 assignment, the output voltage initially equals +12 V and stays at +12 V until the input exceeds +10 V (at 11sec). At the moment when the input voltage equals +10 V (at 11sec), the output immediately jumps to –12 V and stays at –12 V until the input decreases below –8 V (at 22 sec). This
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Unformatted text preview: corresponds to waveform B shown below. Answer: B EECS 314 // Winter 2005 // Exam 3 // Solutions Alexander Ganago Page 20 of 25 April 6 – 19, 2005 18 Consider the circuit shown on the diagram below. The input signal V S has a negative DC offset as shown on the sketch above. Which of the waveforms shows the output signal V OUT ? A. Waveform A B. Waveform B C. Waveform C D. Waveform D E. Waveform E = = = = The circuit does not have a blocking capacitor thus the DC offset is present in the output. The amplifier is inverting thus the DC offset of the output signal is positive. Also, the clipping occurs at the extreme low voltages (around –12 V) or at the extreme high voltages (around +12 V). These facts combined lead to the conclusion that the output waveform is shown as A. Answer: A....
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