Input & Output Limitations 3. Multiple Choice Quiz TI Precision Labs Op Amps
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1 Input & Output Limitations 3 Multiple Choice Quiz TI Precision Labs Op Amps
2 Quiz: Input & Output Limitations 3 1. The figure below shows a classic bipolar output stage. Which of the following is true? a. This is a rail-to-rail output. b. Connecting a load to the output will cause A OL to shift. c. The output swing limit will be about 1V from the supply rail. d. The RF immunity for the op amp will be limited. +V s V sat V be V OUT -V s 2
3 Quiz: Input & Output Limitations 3 2. In the claw curve below, the region at the end of the curve is circled. What causes this bend in the curve? a. The amplifier short circuit limit is turning on. b. The resistance of the output transistors is causing voltage to decrease. c. The amplifier is going into thermal overload. d. The saturation and cutoff of the input stage is causing common mode limitations. 3
4 Quiz: Input & Output Limitations 3 3. For the circuit below, estimate the output swing (slam limit). a < Vout < +4.9V b < Vout < +4.0V c. -3.5< Vout < +3.5V d. -3.0< Vout < +3.0V 4
5 Quiz: Input & Output Limitations 3 4. (T/F) The claw curve represents the linear output swing range for an op amp vs. output current. a. True b. False 5. The DC A OL for some amplifiers will be affected by loading. Which amplifier types are most susceptible to the effect? a. Rail-to-rail b. Classic bipolar 6. What output swing limitation would you expect with a bipolar rail-to-rail amplifier? a. A few millivolts from the rail b. 50mV from the rail c. 300mV from the rail d. 1V from the rail 7. (T/F) If the output is shorted to the negative supply, the short circuit limit will limit the output current and protect the device from damage. a. True b. False 5
6 Quiz: Input & Output Limitations 3 8. The circuit s output is accidentally shorted to a 10V supply as shown below. Will the short circuit protection, prevent damage? a. Yes b. No 6
7 Quiz: Input & Output Limitations 3 9. Based on the data sheet excerpt below, at 125 C, the worst case linear output swing is. a. 30mV from the rail. b. 50mV from the rail. c. 70mV from the rail. d. 100mV from the rail. 7
8 Quiz: Input & Output Limitations For the data sheet excerpt below, the typical short circuit current is set to turn on at +30mA (sourcing) and -45mA (sinking). These limits are for room temperature only. How could you estimate the variation of short circuit current over temperature? a. ±20% b. ±50% c. Use the claw curves 11. For the data sheet excerpt below, the typical short circuit current is set to turn on at +30mA (sourcing) and -45mA (sinking). These limits indicate typical performance only. How could you estimate the worst case? a. ±20% b. ±50% c. Use the claw curves 8
9 Input & Output Limitations 3 Multiple Choice Quiz: Solutions TI Precision Labs Op Amps
10 Solutions: Input & Output Limitations 3 1. The figure below shows a classic bipolar output stage. Which of the following is true? a. This is a rail-to-rail output. b. Connecting a load to the output will cause A OL to shift. c. The output swing limit will be about 1V from the supply rail. d. The RF immunity for the op amp will be limited. +V s V sat V be V OUT -V s 10
11 Solutions: Input & Output Limitations 3 2. In the claw curve below, the region at the end of the curve is circled. What causes this bend in the curve? a. The amplifier short circuit limit is turning on. b. The resistance of the output transistors is causing voltage to decrease. c. The amplifier is going into thermal overload. d. The saturation and cutoff of the input stage is causing common mode limitations. 11
12 Solutions: Input & Output Limitations 3 3. For the circuit below, estimate the output swing (slam limit). a < Vout < +4.9V b < Vout < +4.0V c < Vout < +3.5V d < Vout < +3.0V 12
13 Solutions: Input & Output Limitations 3 4. (T/F) The claw curve represents the linear output swing range for an op amp vs. output current. a. True b. False 5. The DC A OL for some amplifiers will be affected by loading. Which amplifier types are most susceptible to the effect? a. Rail-to-rail b. Classic bipolar 6. What output swing limitation would you expect with a bipolar rail-to-rail amplifier? a. A few millivolts from the rail b. 50mV from the rail c. 300mV from the rail d. 1V from the rail 7. (T/F) If the output is shorted to the negative supply, the short circuit limit will limit the output current and protect the device from damage. a. True b. False 13
14 Solutions: Input & Output Limitations 3 8. The circuit s output is accidentally shorted to a 10V supply as shown below. Will the short circuit protection prevent damage? a. Yes b. No 14
15 Solutions: Input & Output Limitations 3 9. Based on the data sheet excerpt below, at 125 C, the worst case linear output swing is. a. 30mV from the rail. b. 50mV from the rail. c. 70mV from the rail. d. 100mV from the rail. 15
16 Solutions: Input & Output Limitations For the data sheet excerpt below, the typical short circuit current is set to turn on at +30mA (sourcing) and -45mA (sinking). These limits are for room temperature only. How could you estimate the variation of short circuit current over temperature? a. ±20% b. ±50% c. Use the claw curves 11. For the data sheet excerpt below, the typical short circuit current is set to turn on at +30mA (sourcing) and -45mA (sinking). These limits indicate typical performance only. How could you estimate the worst case? a. ±20% b. ±50% c. Use the claw curves 16
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