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US Patent 7474151 Active load with adjustable common-mode level

Patent 7474151 was granted and assigned to Broadcom (company) on January, 2009 by the United States Patent and Trademark Office.

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Current Assignee
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Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7474151
Date of Patent
January 6, 2009
Patent Application Number
11905287
Date Filed
September 28, 2007
Patent Primary Examiner
‌
Henry K Choe
Patent abstract

A differential preamplifier includes an active load with adjustable common-mode output level. The active load includes a transistor pair, a resistor pair, and a current source. The transistor load is employed to provide high gain, low offset, and a large bandwidth for the differential preamplifier. The resistor pair and current source are used to increase the common-mode output level of the differential preamplifier and to bias the transistor load. The current source can be varied to provide an adjustable common-mode output level suitable for driving next stage devices. The active load design allows the differential preamplifier to operate using only low power voltage supplies and with small-sized transistors.

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