A Calibration Method of Temperature Sensor Against Reverse Early Effect

Abstract

The invention discloses a temperature sensor calibration method against the reverse Early effect. The temperature sensor calibration method against the reverse Early effect comprises the following steps: applying an input voltage V<IN> to an ADC input terminal; calculating [Delta]V<BE>(T<1>) and V<BE>(T<1>) at a current first temperature according to the read ADC output at the first temperature; calculating [Delta]V<BE>(T<2>) and V<BE>(T<2>) at a current second temperature according to the read ADC output at the second temperature; and obtaining an actual temperature coefficient in the V<BE> by combining the [Delta]V<BE>(T<1>), the V<BE>(T<1>), the [Delta]V<BE>(T<2>) and the V<BE>(T<2>), and comparing with an ideal temperature coefficient to obtain a temperature coefficient error in the V<BE>. The temperature sensor calibration method against the reverse Early effect avoids the requirement of providing a high-precision temperature environment during the calibration of a high-precisionsensor, and reduces test condition requirements and test costs.

Description

technical field [0001] The invention relates to the field of integrated circuit design and testing, in particular to a temperature sensor calibration method against reverse Early effect. Background technique [0002] With the continuous improvement of application requirements, the accuracy of temperature sensors is also continuously improved. In the process of manufacturing the temperature sensor, errors will inevitably be introduced due to process factors. In order to ensure the accuracy of temperature detection by the temperature sensor, it is necessary to eliminate or reduce these errors to a sufficiently small range through various methods. A common way to eliminate errors is to perform calibration after the chip is fabricated. Calibration is to obtain the error of the sensor through testing, and then use the circuit to eliminate the error. In order to test the error of the sensor, the sensor needs to work in a sufficiently high-precision temperature environment, that...

AI Technical Summary

Problems solved by technology

If the sensor accuracy requirement is higher than ±1°C, it is difficult for the test environment to meet the calibration requirements of the sensor

When the accuracy of the temperature sensor is high enough that the reverse Early effect of the bipolar tube is not negligible, the calibration of the sensor introduces even greater difficulties

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