Question
What determines the frequency of an LC oscillator?
Answer Options
- A) The number of stages in the counter
- B) The number of stages in the divider
- C) The inductance and capacitance in the tank circuit
- D) The time delay of the lag circuit
Correct Answer: C
Explanation
An LC oscillator uses a resonant tank circuit made of an Inductor (L) and a Capacitor (C) to determine its operating frequency. The circuit’s natural resonant frequency is the one that the positive feedback loop will select for continuous oscillation.
The frequency of an LC oscillator is entirely determined by the inductance and capacitance in the tank circuit. This relationship is defined by the resonant frequency formula: f = 1 / (2\pi\sqrt{LC}). To change the frequency, the operator must adjust the value of either L or C (or both).
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