EMC immunity improvements to USB interface

Details EMC immunity improvements to USB interface EMC immunity improvements to USB interface

2006-08-01

2006-08-01

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transient responsive

C361S090000

Reexamination Certificate

active

07085117

ABSTRACT:
A USB interface having improved EMC immunity where the D+, D−, and USB ground lines each pass through a common mode choke. The USB5V line is AC coupled to the USB ground line outside the choke and routed through a high impedance into the circuit while maintaining the integrity of the signal. In addition, bypass capacitors, such as Tantalum bypass capacitors, and a5.6V Transorb device are added to the5V power supply of the controller, and all unused pins are terminated to reduce unwanted ringing transients in the controller leadframe. In addition, small capacitors within the capacitive loading specification allowed by the USB-IF are positioned next to the controller on each data line.

REFERENCES:
patent: 4571656 (1986-02-01), Ruckman
patent: 5956158 (1999-09-01), Pinzarrone et al.
patent: 6101076 (2000-08-01), Tsai et al.
patent: 6452269 (2002-09-01), Ohbayashi
patent: 6937454 (2005-08-01), Mikolajczak et al.

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