Time-Domain Emission Measurements in K-Band

AbstractThe presented time-domain EMI measurement system allows for full-compliance measurements according to CISPR 16-1-1 in the frequency range from 9 kHz to 26 GHz. With the combination of 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, time-domain methods are employed for measurements into K-band. This allows for a reduction in scan times by several orders of magnitude. A scan from 9 kHz to 26 GHz with a 9 kHz IF-filter bandwidth is completed in under 200 s, while over 5 · 106 frequency points are calculated. The use of low-loss components and integrated preamplifiers yields an ultra-low system noise floor power spectral density of typically below --150 dBm/Hz. The system IF dynamic range of over 60 dB allows for the measurement of high-dynamic range signals like radar pulses. Measurements of the radiated emissions of a personal computer and the nonstationary emissions of a microwave oven are presented.     «

AbstractThe presented time-domain EMI measurement system allows for full-compliance measurements according to CISPR 16-1-1 in the frequency range from 9 kHz to 26 GHz. With the combination of 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, time-domain methods are employed for measurements into K-band. This allows for a reduction in scan times by several orders of magnitude....     »