The influence of the instruction codes on radiated near-magnetic-fields $a case study on A5000

Author

Mutoh, Atsuo ; Nitta, Shuichi ; Takamura, Eiji ; Tsukagoshi, Tsuneo

Author_Institution

Tokyo Fuji Univ., Japan

Volume

1

fYear

2002

fDate

19-23 Aug. 2002

Firstpage

167

Abstract

It has been said that the radiated electromagnetic emission (EMI) spectra from the computer change with the kind of the program executed on the computer. In this study, as a first step to investigate the influence of program on EM, the influence of instruction codes executed on a CPU on radiated near-magnetic-field is clarified by experiments and investigation on the timing chart of a CPU. It is concluded that the frequencies having peaks of near-magnetic-field spectra are observed on every frequency obtained by dividing the clock frequency by the number of clocks required for one instruction execution.

Keywords

electromagnetic compatibility; electromagnetic fields; electromagnetic interference; microcomputers; A5000 one-board computer; CPU; clock frequency; instruction codes; instruction execution; radiated electromagnetic emission; radiated near-magnetic-fields; timing chart; Antenna measurements; Clocks; Computer aided instruction; Computer aided software engineering; Electromagnetic interference; Electromagnetic radiation; Frequency; Measurement standards; Microcomputers; Timing;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility, 2002. EMC 2002. IEEE International Symposium on

Conference_Location

Minneapolis, MN, USA

Print_ISBN

0-7803-7264-6

Type

conf

DOI

10.1109/ISEMC.2002.1032468

Filename

1032468