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Bi-polar electronic signal converters with single polarity accurate reference source
| Details |
Inventors: Swift, Steven D.; Parle, Jonathan J.; Gunderson, David A.;
Assignee: John Fluke Mfg. Co., Inc. (Everett, WA)
Primary Examiner: Miller; C. D.
Assistant Examiner:
Attorney, Agent or Firm: Kindness; Gary S., Becker; Stephen A., Ishimaru; Mikio
Bi-polar electronic signal converters, such as analog-to-digital or digital-to-analog converters, with a single polarity accurate reference source are disclosed. In one polarity direction, the accurate reference source is used in a conventional manner to transform the signal to be converted from one form (e.g., analog) to the other form (e.g., digital). In the other polarity direction, an inaccurate reference source is used in a similar conventional manner to convert the signal from one form to the other form. Periodically, the accurate and the inaccurate reference sources are compared to determine a correction multiplier. The correction multiplier is used during conversions using the inaccurate reference source to compensate for the inaccuracy of the inaccurate reference source. |
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DETAILED DESCRIPTION In accordance with this invention, a bi-polar electronic converter with a single polarity accurate reference source is disclosed.
In one polarity direction, the accurate reference source is used in a conventional manner to transform the signal to be converted from one form (e.
g.
, analog) to the other form (e.
g.
, digital).
In the other polarity direction, an inaccurate reference source is used in a similar conventional manner to convert the signal from one form to the other form.
Periodically, the accurate reference source is compared to the inaccurate reference source to determine a correction multiplier.
The correction multiplier is used during conversion using the inaccurate reference source to compensate for the inaccuracy of the inaccurate reference source.
In accordance with further features of this invention, the electronic converter is a dual slope, ratiometric type, analog-to-digital (A/D) converter; and, the accurate and inaccurate reference sources are voltage sources.
In accordance with other features of this invention, the electronic converter can function either as a bi-polar analog-to-digital or a bi-polar digital-to-analog converter; and, the accurate and inaccurate reference sources are voltage sources.
As will be readily appreciated from the foregoing description, the invention provides new and improved bi-polar electronic converters that only require a single accurate reference source, yet provide accurate conversions in both polarity directions.
While the invention was developed primarily for use in analog-to-digital (A/D) converters of the dual slope type, the invention can also be utilized in other types of bi-polar analog-to-digital converters, as well as bi-polar digital-to-analog converters, and other types of bi-polar electronic converters wherein voltage or current reference sources of both positive and negative polarity are required to provide accurate bi-polar conversion of an electronic signal from one form to another form.
Thus, the invention is useful in a wide variety of electronic signal conversion systems
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