What charecteristics the high speed USB cable must have to pass FCC Class B
radiated emissions? We cannot add a ferrite core to the cable to supress the
emissions. The device is a self powered high speed (480 MHz) USB device. From
various testings it is established that the CM curent flowing through the D+ &
D- conductors of the USB cable causing the failures in the radiated emission
testing. The tests also established that the CM current flowing through the 5.0
volts +ve & -ve conductors of the USB cable is not at all contributing for the
emissions.
Is it feasible to have a high speed USB bus powered device with
1.5 m long USB cable to meet FCC / CISPR ClassB radiated emission limits
(without a ferrite core attached to it).
Bharath
PS : I hope this question is appropriate for this forum..
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