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The low ESR is a feature of the MLCC, but this can have adverse effects even in decoupling applications. For example, multiple MLCCs are connected in parallel for decoupling in an IC operating with a large current and a low voltage. The capacitor functions as a capacitor below the SRF (self-resonating frequency) frequency band and as an inductor above the SRF. For this reason, when the SRFs of two MLCCs are close to each other, an LC parallel resonance circuit is created between the SRFs by an inductor and an capacitor and it is easy for them to oscillate. This phenomenon is called "anti-resonance". Anti-resonance creates intense impedance peaks which weaken the noise removal effect at that frequency. This can cause the power supply voltage to become unstable and the circuit to malfunction.

PTM Published on: 2015-09-10