Bi-directional universal serial bus booster circuit

Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Input noise margin enhancement

Reexamination Certificate

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Details

C326S026000, C326S083000, C326S092000

Reexamination Certificate

active

12023659

ABSTRACT:
A bi-directional universal serial bus (“USB”) circuit for boosting a signal on a USB bus disclosed. The circuit includes a first stage inverting buffer coupled to a second stage inverting buffer to form a non-inverting buffer circuit. A high pass filter is coupled in series with the non-inverting buffer circuit to provide AC coupling to the USB bus and to allow fast signal edges through the circuit. The booster circuit is arranged to improve signal quality over a USB bus to allow additional USB devices and longer USB busses to be utilized.

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patent: 6414523 (2002-07-01), Yoshizaki
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patent: 2006/0044028 (2006-03-01), Bhattacharya et al.
patent: 2007/0008742 (2007-01-01), Lee et al.
patent: 2008/0080220 (2008-04-01), Mehta
“Robust Design Techniques for USB Switches in Ultra-Portable and Consumer Applications”, G. Connolly, ESE Magazine, http://www.esemagazine.com/index.php?option=com—content&task=view&id=166&Itemid=2, accessed Jan. 27, 2008.

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