Measurement of electromagnetic interference in time-domain

[摘要] Time-domain EMI measurement systems allow measurement time to be reduced by several orders ofmagnitude. In this paper a novel real-time operating time-domain EMI measurement system ispresented. By the use of several analog-to-digital converters the dynamic range requested by theinternational EMC standards is achieved. A real-time operating digital signal processing unit ispresented. The frequency band that is investigated is subdivided into several sub-bands. A novelimplementation of the 9 kHz IF filter for the frequency 150 kHz to 1 GHz is presented. By thisway the measurement time has been reduced by a factor of 8000 in comparison to conventional EMIreceivers. During emission measurements performed with a modelled IF-bandwidth of 9 kHz the noisefloor is decreased to −19 dBµV in the average detector mode by the implemented lownoise power splitter. Measurements have been performed with the improved measurement system in thefrequency range 30 MHz–1 GHz.

[学科分类] 电子、光学、磁材料