The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 27, 1986
Filed:
Dec. 13, 1983
Theodore B Bozarth, Jr, Perkasie, PA (US);
Arthur M Olsen, Pennsburg, PA (US);
Ronald H Rowlands, Collegeville, PA (US);
Honeywell Inc., Minneapolis, MN (US);
Abstract
A method of digital temperature compensation uses a digital temperature compensation word to produce a digital word modification of a digital input to a temperature sensitive digital to analog converter hereinafter converter. The method includes the steps of sensing the temperature affecting the converter to produce a digital temperature representation which is used by a digital computer to produce an output in accordance with a characterization equation in the form of Output=f(D, M) where D=digital data and M=f(temperature). The temperature stability of the converter is affected by the temperature stability of a reference voltage circuit used in the converter and having a voltage reference diode. A compensation circuit uses a temperature sensor in the form of a second diode, which is thermally coupled to the reference diode, and a tracking type analog-to-digital converter for converting an analog signal. The output of the analog-to-digital converter is supplied as a digital word to a digital computer system which uses the digital word to modify a digital input to the converter. The computer system includes a non-volatile memory in which is stored a characterization equation which describes the performance of the converter as a function of the digital output signal from the computer and the digital representation of temperature from the analog-to-digital converter. Thus, the output from the digital-to-analog converter is compensated for the effect of temperature on the converter.