Analysis of LF Disturbances and Immunity Improvement Techniques for Automotive Distance Ranging Sensors

This paper presents improvement potentials and noise mitigation techniques at the use case of ultrasonic distance ranging sensors for automotive applications. The key element of the product development for improved immunity behavior against noise sources in the low frequency band of below 200 kHz was the fusion of chip level noise quantification using system plausibility check features with the electromagnetic compatibility design optimization of electromechanical subcomponents. For this purpose, empirical and 3D simulation data are generated and analyzed. In addition, radiated immunity measurement methods are presented for the final component evaluation of the low frequency electric and magnetic immunity performance below 200 kHz.