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US 2009/0212856 A1Published application
Analog amplifier having dc offset cancellation circuit and method of offset cancellation for analog amplifiers
AssigneeAgere Systems Inc.
InventorsJinghong Chen, Gregory W. Sheets, Joseph Anidjar, Robert J. Kapuschinsky, Lane A. Smith
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Abstract
An amplifier having DC offset compensation includes at least one input node and a pair of differential output nodes, a biasing circuit coupled to the input node; and a plurality of current sources. Selected ones of said current sources are coupled to the input node to adjust a DC voltage at the input node to provide DC offset compensation for the amplifier
Claims6
An amplifier having DC offset compensation, said amplifier comprising:
- a pair of differential input nodes and a pair of differential output nodes;
- first and second biasing circuits coupled to said input nodes;
- and
- a plurality of binary weighted selectable current sources, said plurality of binary weighted selectable current sources comprising a first group of selectable current sources associated with a first one of said differential input nodes comprising at least one selectable current source and a second group of selectable current sources associated with a second one of said differential input nodes comprising at least one selectable current source, wherein selected ones of said current sources are coupled to said input nodes to adjust a respective DC voltage at each of said input nodes to provide DC offset compensation for said amplifier.
1 more element
Dependencies are inferred from the claim text.