Learning Path
Question & Answer1
Understand Question2
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Explore TopicChoose the Best Answer
A
To amplify the input signal
B
To provide high input impedance and low output impedance
C
To invert the input signal
D
To filter out noise from the signal
Understanding the Answer
Let's break down why this is correct
Answer
A voltage follower, also called a unity‑gain buffer, uses an op‑amp to copy an input voltage exactly to its output without changing it. The op‑amp’s negative feedback forces the output to equal the input, so the gain is one. Because the input is connected to the op‑amp’s inverting terminal and the output feeds back to that same terminal, the circuit presents a very high input impedance and a very low output impedance, making it ideal for driving loads. For example, if you connect a 3 V source to the input, the output will also be 3 V while the source sees almost no load. This makes the voltage follower perfect for isolating a signal source from a heavy load.
Detailed Explanation
A voltage follower gives the circuit a very high input resistance and a very low output resistance. Other options are incorrect because The idea that it amplifies the input signal is a common mistake; Some think it flips the signal upside down.
Key Concepts
voltage follower
Topic
Operational Amplifiers Basics
Difficulty
easy level question
Cognitive Level
understand
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Question 1What is the main function of a voltage follower using an operational amplifier?
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