2020 年 23 巻 6 号 p. 527-532
In conventional near electromagnetic field measurements, there is a problem where a primary noise source cannot be separately identified from candidates of noise sources operating at the same frequency. Therefore, we propose a method to identify the offending wiring by comparing the change in the radiated noise using a notch filter subject to a differential pair pattern. In the experiment, the effectiveness was confirmed for even-order harmonic wave noise, but it was not effective for odd low-order harmonic wave noise. This report examines the reason for the ineffectiveness and demonstrates additional experiments.
Experimental results show that implementing common-mode countermeasures in printed wiring is important in order to identify odd low-order harmonic wave noise using the proposed method.
