### 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

50KHz

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

2

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

Slew rate

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

Greater than one

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

795mV

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

Voltage controlled voltage source

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

5/2 volts

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

10 V

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