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US 7,397,412 B1Granted
Low power analog to digital converter
AssigneeMarvell International Ltd.
InventorThomas B. Cho
Life of this patent
Estimating the term…
Abstract
A pipelined analog to digital converter comprises N stages, wherein N is an integer greater than one. A sample and integrate circuit communicates with at least two stages of the N stages. The sample and integrate circuit selectively samples a first voltage input to one of the at least two stages while integrating a difference between a sampled second voltage input of another one of the at least two stages and a second reference voltage to generate a second residue. The sample and integrate circuit selectively integrates a difference between the sampled first voltage and a first reference voltage to generate a first residue while sampling a second voltage input.
Claims54
A pipelined analog to digital converter, comprising:
- N stages, wherein N is an integer greater than one;
- a sample and integrate circuit that communicates with at least two stages of said N stages and that:
- selectively samples a first voltage input to one of said at least two stages while integrating a difference between a sampled second voltage input of another one of said at least two stages and a second reference voltage to generate a second residue, and
- selectively integrates a difference between said sampled first voltage and a first reference voltage to generate a first residue while sampling a second voltage input.
1 more element
A pipelined analog to digital converter, comprising:
- N stages, wherein N is an integer greater than one;
- a sample and integrate circuit that communicates with at least two stages of said N stages and that includes an amplifier module that receives a sampled input and a reference voltage input and that integrates for one of said N stages based on said sampled input and said reference voltage input while said sample and integrate circuit samples for another one of said N stages.
A pipelined analog to digital converter, comprising:
- N stages, wherein N is an integer greater than one;
- a sample and integrate circuit that communicates with at least two stages of said N stages and that includes an amplifier module that integrates for one of said N stages while said sample and integrate circuit samples for another one of said N stages and that integrates for said another one of said N stages while said sample and integrate circuit samples for said one of said N stages,
- wherein said sample and integrate circuit selectively samples a first voltage input to said one of said at least two stages while integrating a difference between a sampled second voltage input to said another one of said stages and a second reference voltage to generate a second residue, and selectively integrates a difference between said sampled first voltage and a first reference voltage to generate a first residue while sampling a second voltage input.
A pipelined analog to digital converter, comprising:
- N stages, wherein N is an integer greater than one;
- sample and integrate means that communicates with at least two stages of said N stages for selectively sampling a first voltage input to one of said at least two stages while integrating a difference between a sampled second voltage input of another one of said at least two stages and a second reference voltage to generate a second residue, and for selectively integrating a difference between said sampled first voltage and a first reference voltage to generate a first residue while sampling a second voltage input.
A pipelined analog to digital converter, comprising:
- N stages, wherein N is an integer greater than one;
- sample and integrate means for sampling and integrating, that communicates with at least two stages of said N stages and that includes amplifying amplifier means for receiving a sampled input and a reference voltage input and for integrating for one of said N stages based on said sampled input and said reference voltage input while said sample and integrate means samples for another one of said N stages.
A pipelined analog to digital converter, comprising:
- N stages, wherein N is an integer greater than one;
- sample and integrate means for sampling and integrating, that communicates with at least two stages of said N stages and that includes amplifier means for integrating for one of said N stages while said sample and integrate means samples for another one of said N stages and for integrating for said another of said N stages while said sample and integrate means samples for said one of said N stages,
- wherein said sample and integrate means selectively samples a first voltage input to said one of said at least two stages while integrating a difference between a sampled second voltage input to said another one of said stages and a second reference voltage to generate a second residue, and selectively integrates a difference between said sampled first voltage and a first reference voltage to generate a first residue while sampling a second voltage input.
A method for operating a pipelined analog to digital converter, comprising:
- providing N stages, wherein N is an integer greater than one;
- selectively sampling a first voltage input to one of at least two stages of said N stages while integrating a difference between a sampled second voltage input of another one of said at least two stages and a second reference voltage to generate a second residue using a sample and integrate circuit;
- and
- selectively integrating a difference between said sampled first voltage and a first reference voltage to generate a first residue while sampling a second voltage input said another of said at least two stages using a sample and integrate circuit.
1 more element
A method of operating a pipelined analog to digital converter, comprising:
- providing N stages, wherein N is an integer greater than one;
- and
- for at least two stages of said N stages, using a first operational amplifier of a sample and integrate circuit to receive a sampled input and a reference voltage input and to integrate for one of said two stages based on said sampled input and said reference voltage input while said sample and integrate circuit samples for another one of said two stages.
A method of operating a pipelined analog to digital converter, comprising:
- providing N stages, wherein N is an integer greater than one;
- for at least two stages of said N stages, using a first operational amplifier of a sample and integrate circuit to integrate for one of said two stages while said sample and integrate circuit samples for another one of said two stages and to integrate for said another one of said two stages while said sample and integrate circuit samples for said one of said two stages;
- selectively sampling a first voltage input to one of at least two stages of said N stages while integrating a difference between a sampled second voltage input of another one of said at least two stages and a second reference voltage to generate a second residue;
- and
- selectively integrating a difference between said sampled first voltage and a first reference voltage to generate a first residue while sampling a second voltage input said another of said at least two stages.
2 more elements
Dependencies are inferred from the claim text.