An oscillator is an energy conversion device that converts DC power into AC power with a certain frequency. The circuit that constitutes it is called an oscillating circuit. The oscillator is mainly divided into RC, LC oscillator and crystal oscillator.
1. The RC oscillator uses an RC network as the frequency selective phase shifting network. The oscillators are collectively referred to as RC sinusoidal oscillators and are audio oscillators.
2. The LC oscillator uses an LC tank loop as a positive feedback oscillator for the phase shifting and frequency selective network called the LC oscillator.
Classification of LC oscillators:
1 transformer coupling • single tube LC sinusoidal oscillator • differential pair tube LC sinusoidal oscillator
2 three-point type • Capacitor three-point (Kobitz) oscillator • Inductive three-point (Hateley) oscillator
3 improved three-point • Clappo oscillator • Sile oscillator
4 differential pair tube oscillator
3. Crystal oscillator
The oscillator's oscillation frequency is controlled by a quartz crystal oscillator.
characteristic:
1. Physical and chemical properties are very stable.
2. Positive piezoelectric effect and inverse piezoelectric effect, quartz crystal resonant frequency ωs
△ When ω = ωs, the piezoelectric effect zui is strong, and ωs is called the fundamental frequency.
△When ω=nωs, the piezoelectric effect is also strong, which is called the overtone frequency.
1. The RC oscillator uses an RC network as the frequency selective phase shifting network. The oscillators are collectively referred to as RC sinusoidal oscillators and are audio oscillators.
2. The LC oscillator uses an LC tank loop as a positive feedback oscillator for the phase shifting and frequency selective network called the LC oscillator.
Classification of LC oscillators:
1 transformer coupling • single tube LC sinusoidal oscillator • differential pair tube LC sinusoidal oscillator
2 three-point type • Capacitor three-point (Kobitz) oscillator • Inductive three-point (Hateley) oscillator
3 improved three-point • Clappo oscillator • Sile oscillator
4 differential pair tube oscillator
3. Crystal oscillator
The oscillator's oscillation frequency is controlled by a quartz crystal oscillator.
characteristic:
1. Physical and chemical properties are very stable.
2. Positive piezoelectric effect and inverse piezoelectric effect, quartz crystal resonant frequency ωs
△ When ω = ωs, the piezoelectric effect zui is strong, and ωs is called the fundamental frequency.
△When ω=nωs, the piezoelectric effect is also strong, which is called the overtone frequency.
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