Method for calibrating temperature precision of temperature sensor chip

Abstract

The invention discloses a method for calibrating temperature precision of a temperature sensor chip. The method comprises the following steps of: designing and producing the temperature sensor chip, wherein the temperature sensor chip comprises a correction circuit, and a temperature characteristic curve caused by band gap voltage of a semiconductor is shown in the specification: deltaTreal=AT<2>+BT+C; determining symmetric center temperature Talphac; when the temperature sensor chip determines that output temperature is the symmetric center temperature Talphac through a test, adjusting a parameter value C by the correction circuit so as to change a vertex value deltaTreal_1 of the temperature characteristic curve deltaTreal caused by the band gap voltage of the semiconductor in the circuit of the temperature sensor chip; and finally completing calibration of the temperature precision of the temperature sensor chip. By utilizing the invention, the final output temperature precision of the temperature sensor chip can be calibrated only by one temperature test.

Description

technical field [0001] The invention relates to semiconductor integrated circuit design and testing technology, in particular to a method for calibrating temperature accuracy of a temperature sensor chip. Background technique [0002] With the continuous development of the integrated circuit industry and the continuous improvement of the market, customers have higher and higher requirements for electronic products, and lower and lower prices; thus, in order to control costs and improve efficiency, products are required to be optimized in all aspects. The expenditure should be as low as possible without affecting the performance of the product. The test steps of the final product of the sensor chip should be as simple as possible, and the single-chip test time should not be too much, so that the cost of the final test can be controlled. [0003] The method of calibrating the temperature accuracy of the traditional temperature sensor chip usually uses three-point temperature m...

AI Technical Summary

Problems solved by technology

[0003] The method of calibrating the temperature accuracy of the traditional temperature sensor chip usually uses three-point temperature measurement or two-point temperature measurement method to correct the temperature accuracy, which is equivalent to two or more points to determine the slope and parallel deviation of the straight line. By adjusting the temperature sensor chip circuit The temperature characteristic curve ΔT caused by the semiconductor bandgap voltage real = AT 2 The primary temperature coefficient B and the secondary temperature coefficient A in +BT+C are used to accurately adjust the fitting degree of the temperature output temperature curve and the ideal isotherm. Although these methods are accurate and effective, the test cost is still relatively high

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