Ceramic Resonator Oscillator Circuit

The resonator or crystal itself has two connections.

Ceramic resonator oscillator circuit.

See that tutorial for more information. 5 4 equivalent circuit for a ceramic resonator in the frequency range of fr f fa fig. These frequencies are utilized in many ways for their measurement of wavelength. 5 5 impedance and phase characteristics for ceramic resonators fig.

Vfo with ceramic resonator. Highly stable oscillation circuits can therefore be made without the need of adjustment. The most common oscillator circuit for a ceramic resonator is a colpitts circuit. Unlike rc or lc circuits ceramic resonators use mechanical resonance.

The most commonly used circuit is the colpitts circuit. This means it is not basically affected by external circuits or by the fluctuation of the supply voltage. The active part which makes the oscillator work is an amplifier which supplies the energy to keep the oscillation going. A 7 mhz oscillator with a variable crystal oscillator vxo operates very stably but it allows only a small frequency variation approx.

Another oscillating circuit is the one that use resonators. The design of the circuit. On the left the crystal right the ceramic resonator. 5 3 electrical equivalent circuit for a ceramic resonator fig.

Like you say the oscillator needs extra components the two capacitors. 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. The material can have two or more electrode which when connected to an oscillator circuit gets mechanical. Remember from the inductance meter tutorial that an lc tank will resonate at its natural frequency.

Hartley circuit in a ceramic resonator oscillator the inductor is replaced by a ceramic resonator taking advantage of the fact that the resonator becomes inductive between resonant and anti resonant frequencies. The operating principle of these oscillation circuits can be seen in fig 2 1. The crystal oscillator and ceramic resonator are both electronic oscillator circuits. They both use mechanical resonance from piezoelectric material like quartz crystal and ceramics and both create electrical signals of frequency when energized.

A ceramic resonator is an electronic component consisting of a piece of a piezoelectric ceramic material with two or more metal electrodes attached. The table briefly describes the characteristics of various oscillator elements. The operation with a ceramic resonator can be considered as the same. 5 6 spurious characteristics for a typical ceramic resonator csb455e fig.

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. 5 7 basic configuration for an lc oscillation. 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.