Which of the following are basic components of a sine wave oscillator?
The correct answer is D: A filter and an amplifier operating in a feedback loop. The basic components of a sine wave oscillator are a filter and an amplifier operating in a feedback loop. Oscillators use positive feedback with frequency-selective filtering to generate sine waves. For amateur radio operators, this is how oscillators work. Understanding this helps when designing oscillators.
Exam Tip
Sine wave oscillator = filter and amplifier in feedback loop. Think 'O'scillator = 'O'scillates with 'F'eedback 'A'mplifier and 'F'ilter. Uses positive feedback with frequency-selective filtering to generate sine waves. Not divider, not multiplier/mixer, not circulator - just filter and amplifier in feedback.
Memory Aid
"Sine wave oscillator = filter and amplifier in feedback loop. Think 'O'scillator = 'F'eedback 'A'mplifier and 'F'ilter. Uses positive feedback with frequency-selective filtering to generate sine waves. Basic oscillator structure."
Real-World Application
A sine wave oscillator: An amplifier provides gain, and a filter (like an LC tank circuit) selects the frequency. They're connected in a feedback loop - the filter's output feeds back to the amplifier input. This creates sustained oscillation at the filter's resonant frequency. This is how oscillators work.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Oscillators don't use an amplifier and divider - dividers reduce frequency, not generate oscillations. Divider isn't a basic component.
Option B: Incorrect. Oscillators don't use a frequency multiplier and mixer - multipliers increase frequency, mixers combine signals. These aren't basic oscillator components.
Option C: Incorrect. Oscillators don't use a circulator and filter in feed-forward - oscillators use feedback, not feed-forward. Circulator and feed-forward aren't oscillator components.
题目解析
The correct answer is D: A filter and an amplifier operating in a feedback loop. The basic components of a sine wave oscillator are a filter and an amplifier operating in a feedback loop. Oscillators use positive feedback with frequency-selective filtering to generate sine waves. For amateur radio operators, this is how oscillators work. Understanding this helps when designing oscillators.
考试技巧
Sine wave oscillator = filter and amplifier in feedback loop. Think 'O'scillator = 'O'scillates with 'F'eedback 'A'mplifier and 'F'ilter. Uses positive feedback with frequency-selective filtering to generate sine waves. Not divider, not multiplier/mixer, not circulator - just filter and amplifier in feedback.
记忆口诀
Sine wave oscillator = filter and amplifier in feedback loop. Think 'O'scillator = 'F'eedback 'A'mplifier and 'F'ilter. Uses positive feedback with frequency-selective filtering to generate sine waves. Basic oscillator structure.
实际应用示例
A sine wave oscillator: An amplifier provides gain, and a filter (like an LC tank circuit) selects the frequency. They're connected in a feedback loop - the filter's output feeds back to the amplifier input. This creates sustained oscillation at the filter's resonant frequency. This is how oscillators work.
错误选项分析
Option A: Incorrect. Oscillators don't use an amplifier and divider - dividers reduce frequency, not generate oscillations. Divider isn't a basic component. Option B: Incorrect. Oscillators don't use a frequency multiplier and mixer - multipliers increase frequency, mixers combine signals. These aren't basic oscillator components. Option C: Incorrect. Oscillators don't use a circulator and filter in feed-forward - oscillators use feedback, not feed-forward. Circulator and feed-forward aren't oscillator components.
知识点
Sine wave oscillator, Filter and amplifier, Feedback loop, Oscillator components
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.