Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1994-11-30
1997-05-27
Gaffin, Jeffrey A.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341118, 341120, H03M 106
Patent
active
056336390
ABSTRACT:
According to the present invention, a modification of standard successive approximation analog to digital converter circuitry may be utilized to measure an unknown analog value and to produce a digital value after conversion that automatically contains an offset value with respect to a given measurement range. The offset achieved by the successive approximation A/D converter is proportional to an external reference which is used as the reference for the successive approximation A/D converter. The digital value produced according to the present invention is not representative of a raw measurement value but rather is representative of a value with respect to a given measurement range; thus, a digital value of 0 may indicate the minimum value of a given measurement range rather than a value of 0 Ohms, 0 volts, or 0 Amps. This may be expressed in equation form where the desired conversion value is represented by:
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Gaffin Jeffrey A.
Galanthay Theodore E.
Jorgenson Lisa K.
Larson Renee M.
SGS-Thomson Microelectronics Inc.
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