An electromagnetic immunity diagnostic tool for electronic circuits

The electromagnetic immunity of electronic circuits is a significant concern for automotive electronic designers. Many papers have been written concerning the electromagnetic susceptibility (EMS) of electronic modules. However, very little has been written on EMC diagnostic tools and techniques to pinpoint the specific susceptibility problems or immunity levels of electronic circuits. This study discusses in detail the use of direct RF power injection as an EMC diagnostic tool over the frequency range of 500 kHz to 500 MHz. This technique offers advantages of improved repeatability and correlation with vehicle results over other methods currently in use. The methodology of direct RF power injection is detailed so other EMC engineers may benefit from this development