Title :
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
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;
Conference_Titel :
Electromagnetic Compatibility, 2002. EMC 2002. IEEE International Symposium on
Conference_Location :
Minneapolis, MN, USA
Print_ISBN :
0-7803-7264-6
DOI :
10.1109/ISEMC.2002.1032468
