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Open-Loop OpAmp Circuits
19 questions By Tony R. Kuphaldt
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Question 1 of 19
Determine what the magnitude and polarity of the voltmeter’s indication will be in each case:
Reveal answer
Notes:Here, students must apply Kirchhoff’s Voltage Law to determine what the voltmeter’s indication will be. This question works well as a prelude to determining comparator (open-loop opamp) output polarities.
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Question 2 of 19
Determine the output voltage polarity of this op-amp (with reference to ground), given the following input conditions:
Reveal answerIn these illustrations, I have likened the op-amp’s action to that of a single-pole, double-throw switch, showing the “connection” made between power supply terminals and the output terminal.
Notes:Determining which “way” the output of an op-amp drives under different input voltage conditions is confusing to many students. Discuss this with them, and ask them to present any principles or analogies they use to remember “which way is which.”
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Question 3 of 19
Determine the output voltage polarity of this op-amp (with reference to ground), given the following input conditions:
Reveal answerIn these illustrations, I have likened the op-amp’s action to that of a single-pole, double-throw switch, showing the “connection” made between power supply terminals and the output terminal.
Notes:Determining which “way” the output of an op-amp drives under different input voltage conditions is confusing to many students. Discuss this with them, and ask them to present any principles or analogies they use to remember “which way is which.”
