1. Crystal Oscillator: Crystal oscillators utilize the piezoelectric effect of a quartz crystal to generate a stable frequency signal. They are widely used in various electronic devices, such as computers, communications equipment, and consumer electronics.
2. Ceramic Resonator: Ceramic resonators use ceramic as a dielectric material and resonate through the interaction between capacitance and inductance. These devices are compact and low-cost, making them commonly used in low-frequency circuits.
3. LC Oscillator: LC oscillators consist of an inductor (L) and a capacitor (C). Adjusting the values of the inductor and capacitor changes the oscillation frequency. They are simple to manufacture and suitable for a wide range of frequencies.