IEC 61967-1:2002 pdf free download

IEC 61967-1:2002 pdf free download Integrated circuits — Measurement of electromagnetic emissions, 150 kHz to 1 GHz — Part 1: General conditions and definitions
5.3.3 Other RBW for narrowband emissions Where the RF emissions can be verified as being narrowband, and the measurement technique requires a lower noise floor for resolution of the measured signals from the ambient, a reduced RBW may be used.
5.3.4 Emissions type, detector type and sweep speed A determination of whether the emissions are predominately narrowband or broadband can be made by measuring at the default bandwidth and at the next narrower (one-third) increment of bandwidth.
If the measured level of peak values of the spectrum is reduced by 5 dB or more when the bandwidth is reduced by one-third, then the emissions can be considered to be predominately broadband. Examples of narrowband sources are digital ICs operated by a synchronous clock.
They will typically produce a continuous emission spectrum dominated by clock harmonics and fractions. For this reason, the detector chosen will not influence the readings.
The peak detector shall be used for narrowband sources. Examples of possible broadband sources are ICs producing a non-continuous spectrum such as converters and non-synchronous logic. These devices shall be measured, preferably using the peak detector with the sweep speed set to reflect the modulation rate, according to the following formula:
where
V s is the sweep speed in MHz/s;
RBW is the resolution bandwidth in MHz;
f m is the modulation frequency in Hz, defined as the lowest repetition rate of a software routine or other IC operating parameter that may affect the measured RF emissions.
The sweep speed used shall be selected in such a way that a slower sweep speed will not
result in a significant change in the measured emissions.
5.3.5 Video bandwidth
The video bandwidth shall be a minimum of three times the resolution bandwidth.
5.3.6 Verification of calibration for the RF measuring instrument
The calibration of the RF measuring instrument shall be verified by comparison with an independent calibrated instrument, traceable to a recognized standard body, if absolute levels are to be reported.
5.4 Frequency range
The recommended frequency range is 1 50 kHz to 1 GHz, but this may be extended if the specific procedure is usable over an extended frequency range. The range of interest may be smaller when, by function, the IC produces emissions only in that reduced range.
5.5 Pre-amplifier or attenuator
If necessary a preamp or attenuator, either internal or external, may be used. The noise figure of the pre-amplifier or attenuator shall be less than 1 0 dB. The minimum resolution for calibration of the preamplifier is 1 0 points per decade.