I want to know the best approach to connect USB connector's (receptor) Shield to System Ground? Below are the two options.

PC(Earthed)<----- USB Cable ----> USB Connector female(PCB with NO metal casing or Earthing)


simulate this circuit – Schematic created using CircuitLab

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    \$\begingroup\$ WHAT did your EMI tests inhouse indicate were best for interference reduction? \$\endgroup\$ Apr 22 at 12:46
  • \$\begingroup\$ @TonyStewartEE75 Product is at design stage and prototype is not yet available to test. \$\endgroup\$ Apr 22 at 12:49
  • \$\begingroup\$ Then you must test the cables as I suggested with CM chokes for improvements to interference. Otherwise group delay distortion is unaffected. E.g. earth grounded at one end and floating SMPS noise device causing errors at other end from interference \$\endgroup\$ Apr 22 at 13:03
  • \$\begingroup\$ Test on similar USB products \$\endgroup\$ Apr 22 at 13:06
  • \$\begingroup\$ Why not option 3, just connect the shield to ground? (But you need to do it on one side of the cable only). \$\endgroup\$ Apr 22 at 14:07

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