[Physics Class Notes] on Ceramic Capacitors Pdf for Exam

A ceramic capacitor is a value which is fixed, that is a capacitor which is where the material ceramic acts as a dielectric. It is constructed of two or more layers which are alternating ceramic and a layer which is metal and acting as the electrodes. The composition which is of the material that is ceramic defines the behaviour which is electrical and therefore applications. These whole things incorporate approximately one trillion that is 1012 pieces per year.

Ceramic Capacitor Material 

Titanium or Paraelectric dioxide that is rutile was used as the first dielectric in ceramic capacitors because it had a linear temperature that is dependent on capacitance for temperature compensation. This is a circuit of resonance and can replace mica capacitors. In the year 1926, these capacitors were produced in small quantities with increasing production quantities in the 1940s. The style which is of these early ceramics was disc-shaped with metallization on both sides which is contacted with wires which are tinned. This predates style of the transistor and was used extensively in vacuum-tube equipment that is the radio receivers from about 1930 through the 1950s.

Ceramic Disc Capacitor

The ceramic class 2 capacitors really have a dielectric with high permittivity and therefore we can say that it’s a better volumetric efficiency than class 1 capacitors. But we can assume that the lower stability and accuracy of the dielectric ceramic is characterized by a charge which is nonlinear of capacitance over the temperature range. The value of capacitance also depends on the voltage which is applied. They are suitable for we can say that the bypass which is coupling and decoupling applications or we can say for the for frequency circuits discriminating where low losses and high stability of capacitance are less important. They typically exhibit microphones.

The capacitors that are of Class 2  are made of ferroelectric materials such as barium titanate BaTiO3 and the additive which is suitable such as silicon aluminium and the magnesium silicate and aluminium oxide. These ceramics which we have discussed have high to very high permittivity that is 200 to 14,000 which depends on the field strength. Hence we can say that the capacitance value of class 2 capacitors is nonlinear. 

Ceramic Capacitor Detail

But these mixtures which we have discussed have a relatively low permittivity so that the value of capacitance which is of these capacitors are relatively small.

These materials which are dielectric have much higher permittivities. but here at the same time, their values of capacitance are less or more nonlinear over the range of temperature and losses at very high frequencies and are much higher. These are different characteristics which are of electrical or ceramic capacitors which are required to group them into “application classes”. 

Application of Ceramic Capacitor

The ceramic capacitors are divided into two application classes:

• The Class 1 which capacitors offer high stability and low losses for resonant circuit applications.

• The Class 2 capacitor offers high volumetric efficiency for buffer by-pass and applications which are coupling.