A novel automatic digital quasi-peak detector for a time domain measurement system

Braun, Stephan; Krug, F.; Russer, P.

doi:10.1109/isemc.2004.1349948

Cited by 43 publications

(13 citation statements)

References 3 publications

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“…The mathematical formulation of the STFFT is given: (3) and perform the calculation of the spectrogram. Ty pically (2) is reformatted in a way that the signal x is shifted and the window function w has an index that is independent on m. In the time-domain EMI measurement system w [n] is a Gaussian window function that models the IF-filter of an EMI receiver [5].…”

Section: A Overviewmentioning

confidence: 99%

Requirements and solutions for emission measurements in time-domain according to international EMC standards

Braun¹,

Russer

2012

2012 Asia-Pacific Symposium on Electromagnetic Compatibility

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Ahstract-Measurements of electromagnetic interference in time-domain allow to reduce the scan time by several orders of magnitude, in comparison to automated scans performed by the tuned selective voltmeters, which are known as EMI receivers.Spectrum analyzer are used for fast sweeps to get an overview.Such analyzers can perform fast sweeps or scans over large bands.With the update of CISPR 16-1-1 Ed 3.1 the requirements for time-domain EMI measurement systems have been described.These time-domain EMI measurement systems are using the short-time fast Fourier transform to simulate a set of up to 4000 receivers simultaneously. A major requirement is the gapless aquisition during the dwell time. In this paper the requirements and solutions for time-domain measurements are discussed. A major requirement is the gapless processing of the input signal.This requirement is mandatory to detect over the observation time an isolated impulse. Further requirements are IF -filter bandwidths and indication in the various detector modes for difl"erent pulse repetition frequencies as well as the dynamic range. In this paper also the requirements regarding calibration are discussed. It is shown that time-domain measurement system can be used for the accurate measurement for a full compliance final measurement and also for ultra fast sweeps, replacing spectrum analyzers. In both cases the sweep and scantimes are reduced.

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Section: A Overviewmentioning

confidence: 99%

Requirements and solutions for emission measurements in time-domain according to international EMC standards

Braun¹,

Russer

2012

2012 Asia-Pacific Symposium on Electromagnetic Compatibility

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show abstract

“…Typically (3) is reformatted in a way that the signal x is shifted and the window function w has an index that is independent on m. In the time-domain EMI measurement system w[n] is a Gaussian window function that models the IF-filter of an EMI receiver [7].…”

Section: Short-time Fast Fourier Transformmentioning

confidence: 99%

“…An algorithm that allows measurements in the peak, average and rms detector modes to be simulated has been presented in [6]. An algorithm for the quasi-peak detector mode has been presented in [7]. With both algorithms almost all requirements that are given by CISPR 16-1-1 had been fulfilled [8],except continuous processing which is mandatory to provide a gapless IF signal.…”

Section: Introductionmentioning

confidence: 99%

Spectrum analysis and EMI measurements based on time-domain methods

Braun¹

2010

15th Conference on Microwave Techniques COMITE 2010

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Measurements of electromagnetic interference in time-domain allow to reduce the scan time by several orders of magnitude, in comparison to automated scans performed by the tuned selective voltmeters, which are known as EMI receivers. Spectrum analyzer are used for frequency selective measurements of signals. Such analyzers can perform fast sweeps or scans over large bands. A drawback of spectrum analyzers is the long sweep time, when a high frequency resolution is required.In this paper an overview of methods and systems is shown which perform the measurement in time-domain and use the short-time fast Fourier transform for the calculation of the spectrum rather than a sequential measurement. Baseband systems allow to speed up scans by several orders of magnitude. Systems with a broadband downconversion and a broadband analog-to-digital converter system allow to extend the frequency range beyond the Nyquist frequency of todays availabe ADCs. Powerful Short-time fast Fourier transform processors allow to process several frequencies at the same time. A gapless processing allows to analyze unstationary signals as well as small narrowband signals.

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“…An algorithm for recording in time-domain and evaluation of EMI spectra in the Peak, Average and RMS detector modes is presented in [2]. An algorithm for the evaluation of EMI spectra in the quasi-peak detector mode has been presented in [1].…”

Section: Time-domain Emi Measurement Systemmentioning

confidence: 99%

“…The statistical model consists of the description at which point in time a certain pulse or sample has occurred and the stored samples. Measurements have shown, that this description is sufficient to obtain an accuracy of 3 dB for all detector modes [1].…”

Section: Introductionmentioning

confidence: 97%

Predicted radiated emissions of systems according to the EMC standards with a time-domain EMI measurement system

Braun¹,

Russer²

Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.

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Measurements for full compliance tests according to the EMC standards FCC, CISPR and MIL have to be performed with EMI-Receivers that must show the behavior as given in the standards. In order to predict the electromagnetic interference of a system field simulations are performed in frequency-and time-domain. Today complex systems like computer mainboards or automotive systems consist of various components that show a emission that could be described by statistical models. We have presented a Time-domain EMI (TDEMI) Measurement System that observes the input signal and generates a statistical model. This model is used to obtain a spectrum that can be evaluated under the various detector modes of an EMI Receiver. The TDEMI System reduces the measurement time by about a factor of 50.In this paper it is shown that the Time-domain EMI Measurement system allows to predict electromagnetic interference of a system consisting of several characterized components. A statistical model of the emission of each source and a model of coupling is used to obtain a statistical model that describes the complete system. The statistical model of the emission of a single source can be obtained by measurements or system level simulations. The coupling model is obtained by field solving tools. The resulting statistical model of the complete system is used to obtain a spectrum that can be evaluated under peak, quasi-peak, average and rms detector. Measurements have been performed with drill machine and a laptop as an example of a system consisting of two sources in the frequency range 30 MHz-1 GHz.

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A novel automatic digital quasi-peak detector for a time domain measurement system

Cited by 43 publications

References 3 publications

Requirements and solutions for emission measurements in time-domain according to international EMC standards

Requirements and solutions for emission measurements in time-domain according to international EMC standards

Spectrum analysis and EMI measurements based on time-domain methods

Predicted radiated emissions of systems according to the EMC standards with a time-domain EMI measurement system

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