Question
What is the name of a circuit that generates a signal at a specific frequency?
Answer Options
- A) Reactance modulator
- B) Phase modulator
- C) Low-pass filter
- D) Oscillator
Correct Answer: D
Explanation
A circuit that generates a continuous, repetitive alternating current (AC) signal at a precise, controlled frequency is called an Oscillator. This circuit is fundamental to all radio systems.
Oscillators are used to create the RF carrier signal in a transmitter (which is then modulated with audio/data, T7A08). In a receiver, oscillators generate the local signals needed by the mixer circuit (T7A03) to tune to and process the incoming radio waves.
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