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- Keramik-Vielschichtkondensatoren (MLCC)
Figure 2 shows a standard equivalent circuit of a multilayer ceramic capacitor (“MLCC”). And the impedance of the equivalent circuit is shown in Formula 1.
Figure 3 shows an example of C1608JB0J106M frequency and impedance characteristics.
Zs: Total impedance
ESR: Equivalent series resistance
ESL: Equivalent series inductance
Xs: Synthetic impedance
Synthetic impedance is inductance components (2πf・ESL) *1 combined with capacitance components (1/(2πf・C)) *2
Fig. 3 ｜Z｜/f characteristics of C1608JB0J106M
The approximation formula of Xs≒-1/(2π*f*C) works when frequency is sufficiently lower than the resonant frequency because the capacitance component (*2) is much greater and the inductance component can be disregarded because it is so small (the region on the left side in Figure 3). The capacitance value is calculated backward from this formula. In other words, C=-1/(2πf*Xs). However, at self-resonant frequencies and above, impedance 2π*f*ESL (*1) from inductance components is dominant with total impedance Zs, the C=-1/(2πf*Xs）formula cannot be used, and capacitance cannot be calculated. This is why there are sudden changes in values and the apparent disappearance of capacitance in frequencies near self-resonant frequencies and above.
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