Reduction Method of Voltage Fluctuation of DC Power Supply in Digital IC(Special Issue on Recent Progress in Electromagnetic Compatibility Technology)

概要

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This paper describes how voltage fluctuation in the DC power supply of a digital IC can be reduced, by means of molding the package-pin in a ferrite-resin composite.The voltage fluctuation of the DC power supply, when the input terminal was driven by a 40 MHz, 5V_<p-p>pulse wave, was measured using an oscilloscope.Simultaneously, the voltage spectrum of the fluctuation was measured using a spectrum analyzer.As a result, the voltage fluctuation was decreased by about 50% when the IC package-pins were molded in a ferrite-resin composite, in which the μ_<iac> of the ferrite powder equalled 100, and the powder content was 80 weight-%.In the same IC, there was the reduction effect of the voltage spectrum of the fluctuation was recognized in the frequency range 40 MHz to 1 GHz.
社団法人電子情報通信学会の論文
2000-03-25