USB 2.0 HS voltage-mode transmitter with tuned termination...

Details USB 2.0 HS voltage-mode transmitter with tuned termination... USB 2.0 HS voltage-mode transmitter with tuned termination...

2010-10-05

2011-11-29

Ismail, Shawki S (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

Reexamination Certificate

active

08067957

ABSTRACT:
A high-speed universal serial bus (USB) transceiver includes a voltage-mode architecture for generating a USB signal. The voltage mode architecture reduces power consumption by reducing the current requirements for high-speed USB communications. The USB transceiver can include a reference voltage generator, a resistive element, and a switching element for completing and breaking a circuit including the reference voltage generator, the resistive element, and a data pin of a USB port to generate half of the differential USB signal (e.g., the D+ signal). A similar circuit can be used to generate the other half of the differential USB signal (i.e., the D− signal). The resistive element can be a set of parallel resistors in the transceiver, with the set of parallel resistors being specifically selected from a larger population of resistors to provide the specified resistance (45Ω±10%) in the USB transceiver.

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