Correlation of radio frequency interference tests with low dropout voltage regulators

Suppliers of automotive electronic products and modules can select from various component level RF immunity measurement techniques to evaluate and quantify EMI compliance requirements. RF immunity tests are designed to expose the electronic device to EMI threats that are seen in the real world. In this paper, we investigate the correlation between four different test methods used in the automotive electronics industry to test for component compliance due to narrowband conducted and radiated electromagnetic energy. The test methods are described by the ISO 11452 and SAE J1113 standards. A low dropout regulator is exposed to RF fields by several RF immunity tests and the results are discussed. The frequency range of observed RF effects correlate well between different measurements.