CHAPTER 12
THE OPERATIONAL AMPLIFIER
1. The measure of an amplifier’s ability to reject common-mode signals
CMRR
2. It is the typical value of input offset voltage in the ideal case.
0 V
3. It is the dc current required by the inputs of the amplifier to properly operate the first stage.
Input bias current
4. It is the resistance viewed from the output terminal of the op-amp
Output impedance
5. The total resistance between the inverting and noninverting inputs
Differential input impedance
6. Differential impedance is measured by determining the change in ___________ for a given change in differential input voltage.
Bias current
7. Common temperature coefficient for the offset current
0.5nA/°C
8. Functions of negative feedback in an op-amp
Stabilize gain and increase frequency response
9. The voltage gain of an op-amp with external feedback
Closed-loop voltage gain
10. A special case of the noninverting amplifier where all of the output voltage is fed back to the inverting input by a straight connection
Voltage-follower configuration
11. The value of the frequency at which the gain steadily decreases to a point where it is equal to unity
Unity-gain frequency Or unity gain bandwidth
12. It is always equal to the frequency at which the op-amp’s open- loop gain is unity or 0 dB.
Gain-bandwidth product
13. The relative angular displacement of a time-varying function relative to a reference.
Phase shift
14. The three terminals of the basic op-amp not including power and ground
Inverting input, noninverting input, and output
15. It has the highest input impedance and the lowest output impedance of the three amplifier configurations
Voltage-follower
16. The _________ of an op-amp equals the upper critical frequency.
Bandwidth
17. Two types of op-amp input operation.
Differential mode and common-mode
18. A ____________ differentiator uses a capacitor in series with the inverting input.
Ideal
19. An ideal op-amp has ___________ value for voltage gain, bandwidth, and input impedance.
Infinite
20. What should be the output voltage of an op-amp when the differential input is zero
Zero
21. The ideal op-amp has __________ output impedance
Zero
22. The three basic op-amp configurations
Inverting, noninverting, and voltage follower
23. The closed-loop voltage gain is _________ than the open-loop voltage gain. (more or less)
Less
24. Does the gain of an op-amp decreases or increases as frequency increases above the critical frequency
Decreases
25. Devices such as the diode and the transistor which are separate devices that are individually packaged and interconnected in a circuit with other devices to form a complete, functional unit.
Discrete components
26. Most op-amps operate with how many dc supply voltage?
2 (positive and negative)
27. Datasheets often refer to the open-loop voltage gain as the ______________
Large-signal voltage gain
THE OPERATIONAL AMPLIFIER
1. The measure of an amplifier’s ability to reject common-mode signals
CMRR
2. It is the typical value of input offset voltage in the ideal case.
0 V
3. It is the dc current required by the inputs of the amplifier to properly operate the first stage.
Input bias current
4. It is the resistance viewed from the output terminal of the op-amp
Output impedance
5. The total resistance between the inverting and noninverting inputs
Differential input impedance
6. Differential impedance is measured by determining the change in ___________ for a given change in differential input voltage.
Bias current
7. Common temperature coefficient for the offset current
0.5nA/°C
8. Functions of negative feedback in an op-amp
Stabilize gain and increase frequency response
9. The voltage gain of an op-amp with external feedback
Closed-loop voltage gain
10. A special case of the noninverting amplifier where all of the output voltage is fed back to the inverting input by a straight connection
Voltage-follower configuration
11. The value of the frequency at which the gain steadily decreases to a point where it is equal to unity
Unity-gain frequency Or unity gain bandwidth
12. It is always equal to the frequency at which the op-amp’s open- loop gain is unity or 0 dB.
Gain-bandwidth product
13. The relative angular displacement of a time-varying function relative to a reference.
Phase shift
14. The three terminals of the basic op-amp not including power and ground
Inverting input, noninverting input, and output
15. It has the highest input impedance and the lowest output impedance of the three amplifier configurations
Voltage-follower
16. The _________ of an op-amp equals the upper critical frequency.
Bandwidth
17. Two types of op-amp input operation.
Differential mode and common-mode
18. A ____________ differentiator uses a capacitor in series with the inverting input.
Ideal
19. An ideal op-amp has ___________ value for voltage gain, bandwidth, and input impedance.
Infinite
20. What should be the output voltage of an op-amp when the differential input is zero
Zero
21. The ideal op-amp has __________ output impedance
Zero
22. The three basic op-amp configurations
Inverting, noninverting, and voltage follower
23. The closed-loop voltage gain is _________ than the open-loop voltage gain. (more or less)
Less
24. Does the gain of an op-amp decreases or increases as frequency increases above the critical frequency
Decreases
25. Devices such as the diode and the transistor which are separate devices that are individually packaged and interconnected in a circuit with other devices to form a complete, functional unit.
Discrete components
26. Most op-amps operate with how many dc supply voltage?
2 (positive and negative)
27. Datasheets often refer to the open-loop voltage gain as the ______________
Large-signal voltage gain
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