Stage-resolution scalable opamp-sharing technique for pipelined/cyclic ADC
AssigneesHimax Media Solutions, Inc., NCKU Research and Development Foundation
InventorsSoon-Jyh Chang, Jin-Fu Lin, Chih-Haur Huang
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Abstract
An analog-to-digital converter (ADC) for pipelined ADCs or cyclic ADCs is disclosed. The ADC includes at least one pair of two stages connected in series, and the two stages have different bits of resolution. An amplifier is shared by the pair of two stages such that the two stages operate in an interleaved manner. Accordingly, this stage-resolution scalable opamp-sharing technique is adaptable for pipelined ADC or cyclic ADC, which substantially reduces power consumption and increases operating speed.
Claims21
An analog-to-digital converter (ADC), comprising:
- at least one pair of two stages connected in series, wherein the two stages have different bits of resolution;
- and
- an amplifier shared by the pair of two stages such that the two stages operate in an interleaved manner;
- wherein a preceding stage of the pair performs fewer bits of conversion than a later stage of the same pair, whereby the ADC has different stage-resolution for every stage.
A stage-resolution scalable opamp-sharing pipelined analog-to-digital converter (ADC), comprising:
- a plurality of series-connected pairs each having two stages connected in series, wherein a preceding stage of the pair performs fewer bits of conversion than a later stage of the same pair, whereby the ADC has different stage-resolution for every stage;
- and
- a plurality of operational amplifiers (opamps) each being shared by one of the pairs, wherein the two stages operate in an interleaved manner such that one stage of the pair undergoes sampling while another stage of the same pair undergoes amplifying, such that the two stages do not use the shared opamp at the same time.
A stage-resolution scalable opamp-sharing cyclic analog-to-digital converter (ADC), comprising:
- a pair of two stages connected in series, wherein a preceding stage of the pair performs fewer bits of conversion than a later stage of the same pair, whereby the ADC has different stage-resolution for every stage;
- an operational amplifier (opamp) shared by the pair of two stages, wherein the two stages operate in an interleaved manner such that one stage of the pair is under sampling while another stage of the pair is under amplifying, whereby the two stages do not use the shared opamp at the same time;
- and
- an analog multiplexer through which an output of the later stage is fed back to the preceding stage after an end of a cycle of conversion.
Dependencies are inferred from the claim text.