EMI of active front ends applied in the automotive industry

This paper deals with the characterization of an automotive active front end with respect to its EMC-behavior. This requires the measurement of the transfer function for low frequency (functional area) and for RF frequencies (non functional area) with a Vector Network Analyzer (VNA). For the circuit output connection either high impedance probes or impedance matching networks are needed. The advantages and disadvantages of several standard procedures are discussed and a new setup is presented allowing a one step characterization.