Electronic Devices-Operational Amplifiers
Electronic Devices-Operational Amplifiers
1. For an op-amp having a slew rate SR = 5 V/ms, what is the maximum closed-loop voltage gain that can be used when the input signal varies by 0.2 V in 10 ms?
- 150
- 200
- 250
- 300
2. An op-amp has an open-loop gain of 100,000 and a cutoff frequency of 40 Hz. Find the open-loop gain at a frequency of 30 Hz.
- 800
- 8,000
- 80,000
- 100,000
3. What is the level of the voltage between the input terminals of an op-amp?
- Virtually zero
- 5 V
- 18 V
- 22 V
4. An op-amp has an open-loop gain of 75,000 and a cutoff frequency of 100 Hz. At 1 kHz the open-loop gain is down by
- 10 dB.
- 6 dB.
- 20 dB.
- 3 dB.
5. What is the difference output voltage of any signals applied to the input terminals?
- The differential gain times the difference input voltage.
- The common-mode gain times the common input voltage.
- The sum of the differential gain times the difference input voltage and the common-mode gain times the common input voltage.
- The difference of the differential gain times the difference input voltage and the common-mode gain times the common input voltage.
6. A three-stage op-amp can have a maximum phase lag of ________°.
- –180
- –90
- –270
- none of the above
8. What is the open-loop gain of an op-amp at the gain-bandwidth product of the op-amp?
- 200,000
- 50,000
- 200
- 1
9. The ________ amplifier configuration has the highest input impedance and the lowest output impedance of the three basic op-amp configurations.
- non-inverting
- inverting
- voltage-follower
- [NIL]
10. A certain op-amp has an open-loop voltage gain of 150,000. What is this gain expressed in dB?
- 51.7 dB
- 103.5 dB
- 150,000 dB
- 5.18 dB