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US Patent 7642807 Multiple-mode compensated buffer circuit

Patent 7642807 was granted and assigned to Agere Systems on January, 2010 by the United States Patent and Trademark Office.

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Current Assignee
Agere Systems
Agere Systems
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7642807
Date of Patent
January 5, 2010
Patent Application Number
11768496
Date Filed
June 26, 2007
Patent Primary Examiner
‌
Daniel D Chang
Patent abstract

A compensated buffer circuit operative in one of at least a first mode and a second mode includes a plurality of output blocks and a plurality of predrivers, each of the predrivers having an output connected to an input of a corresponding one of the output blocks. Respective outputs of the output blocks are connected together and form an output of the buffer circuit. The output blocks are arranged in a sequence and are binary weighted such that a drive strength of a given one of the output blocks is about twice as large as a drive strength of an output block immediately preceding the given output block. Each of the predrivers selectively enables the corresponding output block connected thereto as a function of a control signal supplied to the predriver for compensating the buffer circuit for PVT variations to which the buffer circuit may be subjected. The respective control signals supplied to the predrivers collectively represent a binary code word, the binary code word in the second mode being equivalent to an arithmetic shift of the binary code word in the first mode.

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