Ceramic In Oscillator Circuit

Vfo with ceramic resonator.

Ceramic in oscillator circuit.

Typical oscillation circuit the most common oscillator circuit for a ceramic resonator is a colpitts circuit. 4 1 briefly describes the characteristics of various oscillator. When connected in an electronic oscillator circuit resonant mechanical vibrations in the device generate an oscillating signal of a specific frequency like the similar quartz crystal they are used in oscillators for purposes such as generating. Unlike rc or lc circuits ceramic resonators utilize mechanical resonance.

This means the resonator is not basically effected by external circuits or by fluctuations of the supply voltage. The material can have two or more electrode which when connected to an oscillator circuit gets mechanical vibration as a result an. The most common oscillator circuit for a ceramic resonator is a colpitts circuit. The design of the circuit varies with the application and the ic to be used etc.

Similar to the crystal oscillator ceramic resonator is also an electronic circuit or a device used to generate an output of oscillation frequency with the help of ceramic as a resonating piezoelectric material. The design of the circuit varies with the application and the ic to be used etc. Remember from the inductance meter tutorial that an lc tank will resonate at its natural frequency. Its q value the ratio of the peak energy stored in the resonator in a cycle of oscillation to the energy lost per radian of the cycle is higher which means crystal oscillators vibrate longer and provide a frequency output with more stability and accuracy than ceramic resonators.

See that tutorial for more information. Although the basic configurations of the circuit is the same as that of a crystal controlled oscillator the difference in mechanical q results from a difference in circuit constants. The ceramic resonator can do the same thing which is to exhibit resonance behavior but there are a few differences between crystal and ceramic resonators and the most important one is the frequency tolerance on heat temperature changes. A crystal oscillator emits a far more precise frequency than does a ceramic resonator.

Before we look at the ceramic and crystal resonators let s take a look at the lc oscillator so we need a coil and capacitor. Highly stable oscillation circuits can therefore be made without the need for adjustment. For that we need an oscillator circuit that we will see in moment. A ceramic resonator is an electronic component consisting of a piece of a piezoelectric ceramic material with two or more metal electrodes attached.

In contrast a vfo with an lc resonant circuit can be tuned over a range of several hundred khz but its frequency stability will depend upon its construction.