Pulse or digital communications – Transceivers – Loopback mode
Reexamination Certificate
2004-10-15
2008-09-16
Payne, David C. (Department: 2611)
Pulse or digital communications
Transceivers
Loopback mode
C375S229000
Reexamination Certificate
active
07426235
ABSTRACT:
Circuitry for equalizing a high data rate serial data stream that receives low frequency and high frequency test tones, accurately measures an amount of attenuation experienced by the high frequency test tone in relation to the low frequency test tone, and accordingly, produces equalization data that results in a corresponding amount of equalization or pre-emphasis being added to an outgoing signal. More specifically, however, the present invention includes both open loop and closed loop systems for equalizing or adding pre-emphasis to a signal with attenuation. In the open loop transceiver system, a presumption is made that an amount of attenuation in both the outgoing and ingoing directions are equal. In the closed loop transceiver system, a receiver determines an amount of equalization and produces the equalization data to a remote transceiver.
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Anderson Stephen D.
Bibee Matthew L.
Gaboury Michael J.
Tetzlaff David E.
Hardaway Michael R.
Harrison James
Nguyen Leon-Viet Q
Payne David C.
Xilinx , Inc.
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