Learning Path
Question & Answer
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To amplify the input signal
To provide high input impedance and low output impedance
To invert the input signal
To filter out noise from the signal
Understanding the Answer
Let's break down why this is correct
A voltage follower gives the circuit a very high input impedance so it does not load the source. Other options are incorrect because It is easy to think a buffer makes the signal bigger, but the voltage follower actually keeps the voltage exactly the same; Some people mix up the follower with the inverting amplifier.
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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