What is a Class D amplifier?
The correct answer is A: An amplifier that uses switching technology to achieve high efficiency. What is a Class D amplifier is an amplifier that uses switching technology to achieve high efficiency. Class D amplifiers switch on/off rapidly for efficiency. For amateur radio operators, this is important for amplifier knowledge. Understanding this helps when working with amplifiers.
Exam Tip
Class D amplifier = uses switching technology to achieve high efficiency. Think 'C'lass 'D' = 'D'igital switching (switching technology). Class D amplifiers switch on/off rapidly for efficiency. Not differential amplifier, not drift-mode FETs, not free from distortion - just switching technology.
Memory Aid
"Class D amplifier = uses switching technology to achieve high efficiency. Think 'C'lass 'D' = 'S'witching. Class D amplifiers switch on/off rapidly for efficiency. Important for amplifier knowledge."
Real-World Application
A Class D amplifier: It's an amplifier that uses switching technology to achieve high efficiency. The amplifier switches rapidly between on and off states, minimizing power dissipation. This is what it is - switching technology for high efficiency.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Low power amplifier using differential amplifier isn't Class D - Class D uses switching technology. Differential amplifier isn't Class D.
Option C: Incorrect. Amplifier using drift-mode FETs isn't Class D - Class D uses switching technology. Drift-mode FETs isn't Class D.
Option D: Incorrect. Amplifier biased to be free from distortion isn't Class D - Class D uses switching technology. Free from distortion isn't Class D.
题目解析
The correct answer is A: An amplifier that uses switching technology to achieve high efficiency. What is a Class D amplifier is an amplifier that uses switching technology to achieve high efficiency. Class D amplifiers switch on/off rapidly for efficiency. For amateur radio operators, this is important for amplifier knowledge. Understanding this helps when working with amplifiers.
考试技巧
Class D amplifier = uses switching technology to achieve high efficiency. Think 'C'lass 'D' = 'D'igital switching (switching technology). Class D amplifiers switch on/off rapidly for efficiency. Not differential amplifier, not drift-mode FETs, not free from distortion - just switching technology.
记忆口诀
Class D amplifier = uses switching technology to achieve high efficiency. Think 'C'lass 'D' = 'S'witching. Class D amplifiers switch on/off rapidly for efficiency. Important for amplifier knowledge.
实际应用示例
A Class D amplifier: It's an amplifier that uses switching technology to achieve high efficiency. The amplifier switches rapidly between on and off states, minimizing power dissipation. This is what it is - switching technology for high efficiency.
错误选项分析
Option B: Incorrect. Low power amplifier using differential amplifier isn't Class D - Class D uses switching technology. Differential amplifier isn't Class D. Option C: Incorrect. Amplifier using drift-mode FETs isn't Class D - Class D uses switching technology. Drift-mode FETs isn't Class D. Option D: Incorrect. Amplifier biased to be free from distortion isn't Class D - Class D uses switching technology. Free from distortion isn't Class D.
知识点
Class D amplifier, Uses switching technology, Achieve high efficiency
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.