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Question & Answer
Choose the Best Answer
The input voltage exceeds the op-amp's input common-mode range.
The gain of the op-amp is set too low for the application.
The feedback resistor is too high, causing instability.
The op-amp is operating within its specified voltage range.
Understanding the Answer
Let's break down why this is correct
When the input voltage goes outside the op‑amp’s input common‑mode range, the device cannot amplify it correctly. Other options are incorrect because Having a low overall gain does not force the output to hit the supply rail; it merely makes the output smaller; A high feedback resistor can make a loop unstable, but that instability usually produces oscillation, not a hard limit at the supply rail.
Key Concepts
Op-Amp Output Saturation
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Deep Dive: Op-Amp Output Saturation
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Definition
Op-amps have output limitations due to the voltage range of their power supply. When the output voltage exceeds this range, the op-amp saturates and outputs the maximum or minimum voltage. Saturation can lead to signal clipping near the power supply rails.
Topic Definition
Op-amps have output limitations due to the voltage range of their power supply. When the output voltage exceeds this range, the op-amp saturates and outputs the maximum or minimum voltage. Saturation can lead to signal clipping near the power supply rails.
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