Temperature sensor calibration method against reverse Early effect

A temperature sensor and Early effect technology, used in thermometer testing/calibration, thermometers, instruments, etc., can solve the problems that the test environment is difficult to meet the sensor calibration requirements, the difficulty of sensor calibration, etc., to reduce the test condition requirements and test costs, The effect of avoiding the need for a high-precision temperature environment

Active Publication Date: 2018-12-18
GIANTEC SEMICON LTD
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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 th

Method used

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  • Temperature sensor calibration method against reverse Early effect
  • Temperature sensor calibration method against reverse Early effect
  • Temperature sensor calibration method against reverse Early effect

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Embodiment Construction

[0058] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0059] figure 1 It is a PNP transistor Q with the common ground of the collector and the base flowing through a bias current of I, and the voltage between the emitter and the collector can be expressed as

[0060] V BE =V BE0 +λ·T+c(T) (1)

[0061] where V BE0 V at absolute zero BE The size of λ is V BE The first-order temperature characteristic of , T is the absolute temperature, c(T) is V BE The higher-order temperature part of .

[0062] V BE The main error of λ is its first-order temperature coefficient λ, so in temperature sensors, usually only the deviation of λ needs to be corrected. However, when the accuracy of the temperature sensor is required to be high enough, or when the reverse Earley effect of the bipolar tube varies greatly under different process corners in some processes, the reverse E...

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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...

Claims

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Application Information

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IPC IPC(8): G01K15/00
CPCG01K15/005
Inventor 陈珍珍夏天张洪杨清
Owner GIANTEC SEMICON LTD
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