Q2 A B Common Mode Currents Generally Produce Higher Radiated Emissions Than Differential Mode Currents Justify Thi 1 (128.47 KiB) Viewed 25 times
Q2 (a) (b) Common-mode currents generally produce higher radiated emissions than differential-mode currents. Justify this statement by using illustration and analytical formulation. (c) (4 marks) RE test is one of the crucial tests for EMC compliance. Nowadays, an automated system is used to perform the RE test to control the antenna, turntable, and other instruments. Present a description in a flowchart form of how the RE test is performed to obtain a list consisting of quasi-peak electric fields measurement. (8 marks) CONFIDENTIAL 2 MEP10203 CONFIDENTIA Figure Q2 (c)(i) depicts a Printed Circuit Board (PCB) with an interface cable. For the given 100 MHz current amplitudes on the circuit loop and interface cable, will the PCB and cable's radiated emission comply with the Federal Communications Commission (FCC) part 15 class B limit? Refer to Figure Q2 (c)(ii) for the FCC part 15 class B limit.
IDM=5 mA at 100 MHz ICM = 50uA at 100 MHz 50 cm 1 cm 2.5 cm Figure Q2 (c)(i): Printed Circuit Board (PCB) with interface cable FCC part 15 class B limit Frequency (MHz) 30-88 88-216 216-960 >960 Limits at 3m(dBμV/m) 40 43.5 46 54 Figure Q2 (c)(ii): FCC part 15 class B limit
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