Resistive capacitor structure for anti-resonance reduction

Abstract

A resistive capacitor structure adding series resistance to a decoupling capacitor for improved decoupling of power and ground plane noise signals. The resistive capacitor couples a resistor in series with the capacitor where the resistor provides high resistance without substantially increasing inductance to thereby dampen anti-resonance noise typically generated when multiple decoupling capacitors are used for filtering a broader range of possible noise signal frequencies. In one aspect, the resistor comprises magnetic material or other low conductivity material, such as iron, having a small skin depth characteristic to thereby reduce the inductance while still providing high resistivity required to dampen anti-resonance noise. The resistive element may be discrete with respect to the decoupling capacitor or may be integral therewith as one of the plates of the decoupling capacitor. The resistive capacitor plates may be integral with and form a part of the power and ground planes of a circuit board.

Dependencies are inferred from the claim text.