METHOD OF DIGITAL TEMPERATURE COMPENSATION AND A DIGITAL DATA HANDLING SYSTEM UTILIZING THE SAME

摘要

APPLICATION OF I. B. BOZARTH, A. M. OLSEN, AND R. H. ROWLANDS A METHOD OF DIGITAL TEMPERATURE COMPENSATION AND A DIGITAL DATA HANDLING SYSTEM UTILIZING THE SAME A method of digital temperature compensation for a digital data handling system uses a digital temperature compensation for producing a digital word modification for an input to a temperature sensitive digital to analog converter. The method includes the steps of sensing the temperature effecting the digital data handling system 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 digital data handling system is affected by the temperature stability of a reference voltage circuit used in the digital-to-analog 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 a count stored in the counter and is supplied as a digital word to a digital computer system which uses the digital word to modify a digital input to the digital-to-analog converter. The computer system includes a non-volatile memory in which is stored a characterization equation which describes the performance of the digital-to-analog 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 digital-to-analog converter especially with rspect to the effect of temperature on the reference diode.