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In this work, a broadband Time-Domain EMI Measurement System with high sensitivity for measurements from 9 kHz to 18 GHz is presented. Combining ultra-fast analog-to-digital-conversion and real-time digital signal processing on a field-programmable-gate-array (FPGA) with ultra-broadband multi-stage down-conversion, scan times can be reduced by several orders of magnitude in comparison to a traditional...
Traditionally emission measurements are carried out in frequency domain using pre- and final scans. Time-domain EMI measurement systems allow to reduce the scan time by orders of magnitude, enabling novel test methods. In this paper the measurement uncertainty for intermittent signals during pre-and final scans is investigated. The effect of the dwell time on the measurement accuracy in the peak and...
Traditionally emission measurements are performed in frequency domain by EMI-Receivers. The drawback of EMI receivers is the long measurement time, up to several hours for a single frequency scan. By emission measurements in time-domain and simulation of several thousand EMI receivers by a digital signal processing unit the measurement time can be reduced by several orders of magnitude. In this paper...
In this paper, an advanced digital signal processing technique for fast measurements of electromagnetic interference from electronic devices in the time-domain at open area test sites will be presented. Suppressing ambient noise by methods based on adaptive filtering algorithms, measurements of electromagnetic interference of a device under test can be performed at a test site polluted with electromagnetic...
In the past and now measurements of electromagnetic interference (EMI) are carried out by EMI-receivers operating in frequency-domain. By a time-domain EMI measurement system the measurement time can be reduced by several orders of magnitude. In this paper a novel real-time time-domain EMI measurement system that uses a hardware implementation of the Fast Fourier transform and the detector modes is...
In this paper an advanced ultra-fast broadband time-domain EMI (TDEMI) measurement system based on a multi-level analog-to-digital converter (ADC) is presented. The proposed multi-level quantization system is compared with a single ADC system. The multi-level system is modelled and investigated experimentally in the 30-1000 MHz frequency range. Measurement results and the results of computer simulations...
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