Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
December 12, 2006
Patent Application Number
10862699
Date Filed
June 7, 2004
Patent Primary Examiner
Patent abstract
A variable-gain amplifier (VGA), with one or more amplifier stages, has two or more offset correction sources connected to apply offset correction signals at different locations in the VGA. In one embodiment, each amplifier stage has both an input offset correction source and an output offset correction source. In another embodiment, each amplifier stage of a multi-stage VGA has an input offset correction source. By sequentially calibrating each amplifier stage, starting with the initial stage and proceeding downstream, the entire VGA can be calibrated to achieve gain-independent compensation for the adverse affects of input and output voltage offsets at the input and output, respectively, of each stage.
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