TM4C123GE6PM: USB connection adds DC offset to ADC in Tiva part - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums
USB cables: shielding matters as well...
Are things powered through USB ports in the PC case also grounded to the case? - Quora
Floating' ports can sink the ship - USB shield grounding \ VOGONS
AN 26.2
I put my RTL2832U - R820T SDR into a metal case, it seems to help quite a bit with interference, here is what I did. : r/RTLSDR