Opamp Circuits

1. A 741-Type OP-AMP has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of

1. 50KHz
2. 100KHz
3. 1000/17KHz
4. 1000/7.07KHz

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2. A differential amplifier has a differential gain of 20,000. CMMR=80dB. The common mode gain is given by

1. 2
2. 1
3. 43862
4. 0

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3. 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

1. CMMR
2. Bandwidth
3. Slew rate
4. Open-loop gain

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4. A non inverting closed loop op amp circuit generally has a gain factor

1. Less than one
2. Greater than one
3. Of zero
4. Equal to one

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5. An amplifier using an opamp with slew rate SR=1v/sec has a gain of 40db.If this amplifier has to faithfully amplify sinusoidal signals from dc to 20KHz without introducing any slew-rate induced distortion, then the input signal level exceed

1. 795mV
2. 395mV
3. 795mV
4. 39.5mV

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6. An ideal OP-AMP is an ideal

1. Current controlled Current source
2. Current controlled voltage source
3. Voltage controlled voltage source
4. voltage controlled current source

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7. An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is

1. 10 volts
2. 5 volts
3. 5/ volts
4. 5/2 volts

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8. An opamp has a slew rate of 5V/ S. the largest sine wave o/p voltage possible at a frequency of 1MHz is

1. 10 V
2. 5 V
3. 5V
4. 5/2 V

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9. Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be

1. Square wave
2. Triangular wave
3. Parabolic wave
4. Sine wave

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10. Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5kΩ and C1 = 0.05μF

1. 1.273kHz
2. 12.73kHz
3. 127.3 kHz
4. 127.3 Hz

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