Three-step converter
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United States of America Patent
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Apr 24, 2001
Grant Date -
N/A
app pub date -
Jan 11, 1996
filing date -
Mar 10, 1993
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Abstract
The present invention provides an A/D converter. An upper comparison voltage generator divides a reference voltage into a plurality of large-level regions with series-connected first voltage-dividing elements, and outputs voltages at boundaries of the individual large-level regions as upper comparison voltages. Upper comparators compare an analog input voltage with the individual upper comparison voltages. An upper encoder determines, from output signals of the upper comparators, to which one of the large-level regions the analog input voltage belongs, and outputs a predetermined upper digital code corresponding to the determined large-level region. A lower comparison voltage generator divides the large-level region to which the analog input voltage is determined to belong by the upper encoder, into a plurality of small-level regions with second voltage-dividing elements and outputs voltages at boundaries of the individual small-level regions as lower comparison voltages. Lower comparators compare the analog input voltage with the individual lower comparison voltages. A lower encoder determines, from output signals of the lower comparators, to which one of the small-level regions the analog input voltage belongs, and outputs a predetermined lower digital code corresponding to the determined small-level region.
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