US Patent 7088274 Difference amplifier for digital-to-analog converter

Patent 7088274 was granted and assigned to Texas Instruments on August, 2006 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Texas Instruments

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

70882740

Patent Inventor Names

Mark Allan Shill0

Date of Patent

August 8, 2006

Patent Application Number

101199130

Date Filed

April 9, 2002

Patent Primary Examiner

‌

Peguy JeanPierre

Patent abstract

An improved circuit is provided that buffers the output of a DAC while improving the bandwidth and linearity of the circuit. A DAC comprises an output signal of a switched DAC circuit coupled to an inverting node of an output buffer configured as a difference amplifier, while a non-inverting node of the difference amplifier is coupled to a fixed reference potential. As a result, the difference amplifier buffers the output of the switched DAC circuit while permitting the use of N-type input stages in the amplifier, which can enhance the bandwidth capability of the circuit.