Circuit and method for measuring and digitizing the value of a resistance
Patent 4814692 Issued on March 21, 1989. Estimated Expiration Date: 
December 22, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 22, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3660834 3786350 3810152 3875501 3875503 3895376 3918050 Automated calibration and standardization apparatus Clocked precision integrating analog to digital converter system Measuring apparatus providing separate analog and digital outputs InventorAssigneeApplicationNo. 07/137022 filed on 12/22/1987US Classes:324/607, Including a conversion (e.g., A->D or D-> A) process324/704, With ratio determination324/711, Including R/C time constant circuit341/166Intermediate conversion to time intervalExaminersPrimary: Eisenzopf, Reinhard J.Assistant: Solis, Jose M. Attorney, Agent or FirmInternational ClassesH03M 1/50 (20060101)G01K 7/24 (20060101) G01K 1/00 (20060101) G01K 7/16 (20060101) G01K 1/02 (20060101) G01K 17/00 (20060101) Foreign Application Priority Data1984-09-06 CHAbstractThe invention relates to a circuit and a method adapted for measuring and digitizing the value of a resistance. The circuit includes and A/D converter operating in accordance with a charge balancing principle, and a resistance network connected to the A/D converter so that the resistance is both a component of the A/D converter and of the resistance network. The A/D converter and the resistance network are interconnected in such a manner so as to permit only a purely resistive measurement. A processor is connected to the A/D converter for obtaining a composite measured resistance value from a plurality of individual measured resistance values. The method according to the invention permits accurate (or precise) resistance measurements having a high degree of resolution of an order of magnitude of 105 points. The method is applicable in particular for temperature measurements, for examples in calorimeters or in precision scales, but also in other resistance measurements.Other References
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