Automatic range shift system and method for an analog to digital converter
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United States of America Patent
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Feb 2, 2010
Grant Date -
Nov 27, 2008
app pub date -
May 22, 2008
filing date -
May 23, 2007
priority date (Note) -
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Abstract
Automatic range shifting for an analog to digital converter (ADC) includes combining an external analog input and a DAC output to provide an input to the ADC, detecting whether the range of the output of the ADC is above a predetermined upper range limit or below a predetermined lower range limit, and generating an adjustment code to increase the DAC output if the ADC output is above the upper range limit and to decrease the DAC output if the ADC output is below the lower range limit for decreasing the ADC input when the ADC output is above the upper limit and to increase the ADC input when the ADC output is below the lower limit to keep the ADC input within the ADC range.
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