Circuits and methods with comparators allowing for offset reduction and decision operations
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United States of America Patent
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Jul 15, 2008
Grant Date -
Nov 8, 2007
app pub date -
Jul 13, 2007
filing date -
Dec 16, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
Circuits and methods may be improved by using ADCs that compensate for the effect of comparator input offset on comparator decisions. Offset compensation may be implemented in an ADC by using an amplifier section between the input of the ADC and a comparator section of the ADC to amplify the signals supplied to the comparator inputs and thereby reduce the effect of comparator offset on the comparator decision. The comparator section may be an autozeroing comparator section that is capable of performing an offset reduction operation to store offset compensation values at capacitors provided at its inputs. The amplifier section may be an autozeroing amplifier section having one or more amplifier stages that are capable of performing an offset reduction operation to store offset compensation values at capacitors provided at their inputs. Offset compensation may also be implemented using an autozeroing comparator section without a preceding amplifier section.
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