Learning Path
Question & Answer
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To prevent loading the previous stage of the circuit
To increase the power output
To reduce the noise in the signal
To allow for greater voltage swings
Understanding the Answer
Let's break down why this is correct
A high input impedance means the op‑amp draws almost no current from its input. Other options are incorrect because Some think a high input impedance boosts power, but it only limits current draw; People sometimes link impedance to noise reduction, yet noise is mainly from temperature and device size.
Key Concepts
Operational Amplifiers Basics
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Deep Dive: Operational Amplifiers Basics
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Definition
Operational amplifiers (op-amps) are devices that amplify the difference between their two inputs by a large gain factor. They have five terminals, including power supply terminals, inverting and non-inverting inputs, and an output terminal.
Topic Definition
Operational amplifiers (op-amps) are devices that amplify the difference between their two inputs by a large gain factor. They have five terminals, including power supply terminals, inverting and non-inverting inputs, and an output terminal.
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