Question
Which of the following are basic components of a sine wave oscillator?
Answer Options
- A) An amplifier and a divider
- B) A frequency multiplier and a mixer
- C) A circulator and a filter operating in a feed-forward loop
- D) A filter and an amplifier operating in a feedback loop
Correct Answer: D
Explanation
A sine wave oscillator is an electronic circuit designed to produce a continuous, repeating waveform without an external input signal. The circuit relies on two primary conditions: positive feedback and loop gain.
The basic components required are a filter and an amplifier operating in a feedback loop. The amplifier increases the signal level, and the filter (often an LC tank circuit or a crystal) determines the frequency by only permitting a narrow band of frequencies to pass. A portion of the filtered output is fed back to the input (positive feedback), maintaining oscillation at the filter’s resonant frequency.
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