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Usually, what should our circuit a suitable capacitor selection? General requirements for high frequencyperformance is good, fast reaction speed.
Specific to note the following points: electrostatic capacity;rated pressure; volume error; capacitance change under DC bias; types of noise level capacitor; capacitorspecifications.
Capacitor as peripheral component, almost every device in Datasheet or Solutions, are clearly indicated parameter selection of the peripheral components, that is to say, it canobtain the basic device selection requirements, and furtherimprove the refinement of the. In fact, the capacitor is not only see the capacity and package, depending on the product of the use of the environment, the special circuitmust use special capacitor.
According to the classification of dielectric permittivity,dielectric constant directly affect the stability of the circuit.
NP0 or CH (K < 150): the most stable, and basically does not change with temperature, voltage and time changes,suitable for high requirement on the stability of high frequency circuit. In view of the fact that the K value is smaller, so in 0402, 0603, 0805 package is very difficult tohave a large capacity capacitor. As the 0603 biggest 10nFgeneral.
X7R or YB (2000 < K < 4000): electrical performance more stable performance, changes in temperature, voltage and time when the change is not significant (? C < ± 10%).Suitable for blocking, coupling, bypass and the capacity of the stability requirements are not too high a full frequency detector circuit.
Y5V or YF (K > 15000): volume stability was worse than that of X7R (? C < +20% ~ -80%), capacity, loss is more sensitive to temperature, voltage and other test conditions,the K value is large, suitable for some situations that require high capacitance value.
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