- A. Energy is to be stored/discharged in parasitic capacitances.
- B. Effects of temperature would be compensated.
- C. Devices in the circuit should be allowed time for saturation and desaturation.
- D. It would prevent noise from causing false triggering.
OP amp
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Hysteresis is desirable in Schmitt-trigger, because_____.
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An opamp has a slew rate of 5V/ S. the largest sine wave o/p voltage possible at a frequency of 1MHz is_____.
- A. 10 V
- B. 5 V
- C. 5 V
- D. 5/2 V
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A certain noninverting amplifier has Ri of 1 kΩ and Rf of 100 kΩ. The closed-loop voltage gain is_____.
- A. 100000
- B. 1000
- C. 101
- D. 100
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A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_____.
- A. CMMR
- B. Bandwidth
- C. Slew rate
- D. Open-loop gain
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In differential-mode_____.
- A. opposite polarity signals are applied to the inputs
- B. the gain is one
- C. the outputs are of different amplitudes
- D. only one supply voltage is used
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In the common mode_____.
- A. both inputs are grounded
- B. the outputs are connected together
- C. an identical signal appears on both the inputs
- D. the output signal are in-phase
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In the above circuit the current ix is_____.
- A. 0.6A
- B. 0.5A
- C. 0.2A
- D. 1/12A
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Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5kΩ and C1 = 0.05μF_____.
- A. 1.273 kHz
- B. 12.73 kHz
- C. 127.3 kHz
- D. 127.3 Hz
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The OP-amp can amplify_____.
- A. c. signals only
- B. d.c. signals only
- C. both a.’and d.’signals
- D. neither ‘c. nor a.c. signals
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The input stage of an OP-amp is usually a_____.
- A. differential amplifier
- B. class B push-pull amplifier
- C. CE amplifier
- D. swamped amplifier