Reduction method of common-mode noise on power supply cable using floating conductor

A method to reduce common-mode current flowing on a wire harness attached to a printed circuit board is proposed in this paper. In this method, SMD inductors are placed on a power supply line and/or a ground line on a LSI package with floating conductor to control balance of impedance of the power distribution network, and the common-mode current can be reduced. The common-mode voltage is reduced about 20 dB with the package proposed in this paper.