抵抗付きデカップリングキャパシタによるノイズ低減

抄録

Noise reduction effect using decoupling capacitor with series resistor was studied. It is well known that the decoupling capacitor is a familiar noise reduction technique on a printed circuit, and its effect is limited at high frequency by some parasitic inductances such as lead, trace and so on. Some capacitors are often connected in parallel for widening its band, but its impedance grows up highly at parallel resonance frequency. In this paper, the effect of the suppression of parallel resonance by decoupling capacitor with resistor is described and the relation between band width and device parameters is shown. The reducion effect is measured and simulated about transmission characteristic and near magnetic field.