Ceramic Resonator Oscillator Circuit

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.

Ceramic resonator oscillator circuit. Highly stable oscillation circuits can therefore be made without the need of adjustment. The operation with a ceramic resonator can be considered as the same. A 7 mhz oscillator with a variable crystal oscillator vxo operates very stably but it allows only a small frequency variation approx. 5 3 electrical equivalent circuit for a ceramic resonator fig.

This means it is not basically affected by external circuits or by the fluctuation of the supply voltage. A ceramic resonator is an electronic component consisting of a piece of a piezoelectric ceramic material with two or more metal electrodes attached. 5 6 spurious characteristics for a typical ceramic resonator csb455e fig. The material can have two or more electrode which when connected to an oscillator circuit gets mechanical.

See that tutorial for more information. 5 7 basic configuration for an lc oscillation. The design of the circuit. Unlike rc or lc circuits ceramic resonators use mechanical resonance.

They both use mechanical resonance from piezoelectric material like quartz crystal and ceramics and both create electrical signals of frequency when energized. 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. 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. Like you say the oscillator needs extra components the two capacitors.

The operating principle of these oscillation circuits can be seen in fig 2 1. The table briefly describes the characteristics of various oscillator elements. 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. 5 4 equivalent circuit for a ceramic resonator in the frequency range of fr f fa fig.

In a colpitts circuit an inversion of 180 is used and it is inverted more than 180 with l and c in the feedback circuit. The most commonly used circuit is the colpitts circuit. 5 5 impedance and phase characteristics for ceramic resonators fig. On the left the crystal right the ceramic resonator.

The most common oscillator circuit for a ceramic resonator is a colpitts circuit. The active part which makes the oscillator work is an amplifier which supplies the energy to keep the oscillation going. Vfo with ceramic resonator. 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.

The crystal oscillator and ceramic resonator are both electronic oscillator circuits. These frequencies are utilized in many ways for their measurement of wavelength. The resonator or crystal itself has two connections.