Difficulty: Easy
Correct Answer: power amplifier
Explanation:
Introduction / Context:A push–pull amplifier is widely used in audio systems and RF transmitters. It consists of two active devices operating in opposite half-cycles of the input waveform.
Given Data / Assumptions:
Concept / Approach:The purpose of push–pull is to deliver significant power to a load, hence it is a power amplifier. Voltage or current amplifiers deal with small signal conditioning, not direct load driving.
Step-by-Step Solution:
Two transistors (NPN and PNP or MOSFET pairs) amplify alternate halves of the waveform.When combined, they produce a larger output signal with reduced harmonics.This makes it efficient for delivering power to speakers or loads.Verification / Alternative check:Datasheets and textbooks define push–pull amplifiers under “power amplifier” categories.
Why Other Options Are Wrong:
Voltage amplifier: small-signal stages, not output stage.Current amplifier: specialized, not the push–pull use.None of the above: incorrect, it clearly belongs to power class.Common Pitfalls:
Confusing “signal amplifier” role with final power delivery.Final Answer:
power amplifier
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