Ceramic Capacitor Q Factor

A capacitor creates in ac circuits a resistance the capacitive reactance there is also certain inductance in the capacitor.

Ceramic capacitor q factor.

It is the inverse of the. Where qc is the quality factor xc is the reactance of the capacitor c the capacitance of the capacitor rc is the equivalent series resistance esr of the capacitor and ω0. This is illustrated by the following table. Class 2 caps exhibit.

A ceramic capacitor is a fixed value capacitor where the ceramic material acts as the dielectric. Best part will have the highest q. The quality factor is a measure of the extent to which a capacitor acts like a theoretically pure capacitor6. Read about q in the context of capacitors in general in our article on capacitor basics.

Two types of ceramic capacitors are widely used in modern electronics. Q quality factor esr equivalent series resistance x c reactance of the capacitor in ohms. How to measure capacitors test a capacitors 7. Capacitors ceramic capacitors multilayer ceramic chip capacitors mlcc with dipped radial lead.

It is a fundamental expression of the energy losses in a resonant system. The q factor of a capacitor also known as the quality factor or simply q represents the efficiency of a given capacitor in terms of energy losses. It is convenient to define the q or quality factor of a capacitor. Capacitor type cap pf f mhz rs milliohms df q paper foil 100 1 1 0 062830 15 9 ceramic x7r 100 1 0 4 0 025132 39 8 typical np0 100 1 0 015 0 000942 1061 1 mci hi q 100 1 0 0015 0 000094 10610 6.

Finally the capacitor has resistive losses together these three elements produce the impedance z. The capacitor causes a change in the resonant frequency and the q factor whose values are now different from those of the unloaded coaxial line. How can i accurately measure the quality factor q. In ac circuits it produces an inductive reactance that tries to neutralize the capacitive one.

The q factor represents the effect of electrical resistance and characterizes a resonator s bandwidth relative to its center or resonant frequency. A concise guide to ceramic capacitor types march 30 2018 by robert keim. The need for high q capacitors. Essentially for a capacitor it is the ratio of the energy stored to that dissipated per cycle.

If you design audio devices or if you simply prefer quiet pcbs you have another reason to choose c0g over x7r or x5r. Transmission line calculations are employed and the esr value is determined based on the relationship between the new frequency and q factor and the frequency and q factor of the initial unloaded. A ceramic capacitor uses a ceramic material as the dielectric. Image courtesy of digi key.

It is defined as. Multilayer ceramic mlcc and ceramic disc as shown in fig. Save time searching the capacitors of your design. A high q value is a mark of the quality of the resonance for resonant circuits.