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In high-speed digital circuits, 0.1μF capacitors (decoupling capacitors) near power pins are critical for suppressing high-frequency noise, validated by authoritative studies:
Murata’s technical report reveals that 0402-packaged 0.1μF X7R capacitors achieve an impedance of 0.1Ω at 100MHz, with a self-resonant frequency (SRF) of 15MHz, effectively covering typical noise bands of digital ICs. The impedance formula is:
IEEE EMC Journal experiments confirm that at switching frequencies above 50MHz, 10μF capacitors suffer from impedance spikes due to parasitic inductance (~2nH), while 0.1μF capacitors maintain low impedance.
Chen et al. at the 2022 IEEE EMC Symposium proved that when capacitors are placed >3mm from ICs, trace inductance (1nH/mm) increases 100MHz noise impedance by 63%.
Kemet’s application guide highlights X7R dielectrics with <±15% capacitance variation (25°C–125°C), whereas Y5V materials degrade by 80% under 5V bias.
Swaminathan in Power Integrity Design stresses that a 0.1μF+10μF combination extends power impedance bandwidth to 0.1MHz–1GHz, eliminating 46% impedance gaps in single-capacitor solutions.
ANSYS SIwave simulations show that placing four 0.1μF capacitors at BGA corners achieves <0.5mΩ power impedance up to 1GHz, meeting modern processor requirements.
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