Comparators capable of output offset calibration
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United States of America Patent
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Dec 26, 2006
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app pub date -
Feb 23, 2005
filing date -
Feb 23, 2005
priority date (Note) -
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Abstract
Comparators outputting offset calibration. A MOS current mode logic (MCML) circuit receives input signals and generates differential logic signals on output terminals thereof, and comprises a calibration unit coupled to the output terminals, calibrating output offsets at the output terminals according to digital calibration codes. An output stage is coupled to the differential logic signals at the output terminals of the MCML circuit to amplify the differential logic signal and generating a comparison resulting signal. By adjusting the digital calibration codes applied to the calibration unit, current on the output terminals can be adjusted, such that output offsets at the output terminals of the MCML circuit 10 can be eliminated.
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