Abstract
Abstract. Time-domain EMI measurement systems allow measurement time to be reduced by several orders of magnitude. In this paper a novel real-time operating time-domain EMI measurement system is presented. By the use of several analog-to-digital converters the dynamic range requested by the international EMC standards is achieved. A real-time operating digital signal processing unit is presented. The frequency band that is investigated is subdivided into several sub-bands. A novel implementation of the 9 kHz IF filter for the frequency 150 kHz to 1 GHz is presented. By this way the measurement time has been reduced by a factor of 8000 in comparison to conventional EMI receivers. During emission measurements performed with a modelled IF-bandwidth of 9 kHz the noise floor is decreased to −19 dBµV in the average detector mode by the implemented low noise power splitter. Measurements have been performed with the improved measurement system in the frequency range 30 MHz–1 GHz.
Highlights
Emission measurements are carried out by EMI receivers operating in frequency domain
Time-domain EMI measurement systems allow measurement time to be reduced by several orders of magnitude
By real-time implementation of the digital signal processing on field programmable gate arrays (FPGAs) the measurement time for a single scan has been reduced by a factor of 2000 (Braun et al, 2006) in the CISPR Band C, D
Summary
Emission measurements are carried out by EMI receivers operating in frequency domain. By real-time implementation of the digital signal processing on field programmable gate arrays (FPGAs) the measurement time for a single scan has been reduced by a factor of 2000 (Braun et al, 2006) in the CISPR Band C, D. By this way continuous processing has been implemented as required by CISPR 16-1-1 (2006). During the digital signal processing a numerical oscillator is used to increase the frequency resolution and reduce the picket fence effect By this way the measurement time has been reduced by a factor of about 8000 for a single scan in comparison to a conventional system. By a low-noise implementation of the floating point analog-to-digital conversion the noise figure has been decreased to about 7.5 dB
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