Electromagnetic compatibility (EMC) is playing an important role concerning engineering efforts and costs, especially in automotive systems. Since the number of microcontrollers and other digital circuits applied in automotive system environments, their clock frequency, port speed, and the number of signal lines is increasing, electromagnetic emission (EME) of such integrated circuits (ICs) becomes even more critical. In this paper, first the sources and the effect of electromagnetic noise induced by high speed ICs are discussed. A major source of circuit induced noise is due to digital output drivers. Usually, pad drivers are designed to drive a specified maximum load under worst conditions, which leads to very fast signal rise and fall times and relatively high output current slopes under normal conditions. Using as an example a motor control unit, it is demonstrated, that driver strengths are oversized in most cases. Thus, more realistic driver specifications adapted to the actual needs and as a result improved pad driver circuits are demanded. Intelligent driver concepts are presented which allow to match the required driver strengths under different load and operating conditions.
Digital integrated circuits - a source of electromagnetic emission in automotive systems
Digitasle integriwerte Schaltkreise - eine Quelle elektromagnetischer Emissionen im Kraftfahrzeug
2000
8 Seiten, 9 Bilder, 6 Quellen
Conference paper
English
Digital integrated circuits - a source of electromagnetic emission in automotive systems
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