TEMPERATURE-TO-DIGITAL CONVERTER
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United States of America Patent
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Jan 25, 2005
Grant Date -
Jan 27, 2005
app pub date -
Jul 22, 2003
filing date -
Jul 22, 2003
priority date (Note) -
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Abstract
A temperature to digital converter device is implemented by integrating a temperature sensor circuit into an analog-to-digital converter (ADC). Temperature-to-digital conversion is accomplished by first measuring a change in voltage (ΔVBE) across the junction of a diode when different current densities are forced through the junction. The thus obtained ΔVBE is proportional to temperature. As part of the conversion processing, ΔVBE is multiplied by a fixed gain, and an offset voltage value is subtracted from ΔVBE. The multiplication and subtraction functions are performed by a switched-capacitor integrator in a delta-sigma ADC and the ADC itself operates as the temperature-to-digital converter device, eliminating the extra amplifier and/or capacitors required when the multiplication and/or subtraction function are performed outside the ADC. Alternately, other ADC topologies that include an integrator or gain amplifier, such as pipeline ADCs and cyclic ADCs may be used in place of the delta-sigma ADC.
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