Semiconductor integrated circuit and temperature drift compensation method for semiconductor integrated circuit

Abstract

Embodiments relate to semiconductor integrated circuits and temperature drift compensation methods for semiconductor integrated circuits. The semiconductor integrated circuit includes: a bandgap reference circuit configured to generate a reference voltage V REF ; The temperature drift compensation circuit is coupled to the bandgap reference circuit and is configured to compensate the reference voltage V based on digital control logic REF The temperature drift; the micro current source circuit, coupled to the bandgap reference circuit, and configured to be based on the reference voltage V REF Generating microcurrent I OUT1 ; and a current amplifying and testing circuit, coupled to a microcurrent source circuit, and comprising an operational amplifier U 3 , resistance R 9 , resistance R 10 , Heating power transistor Q 4 , and switch K 1 , switch K 2 and switch K 3 , the current amplification and test circuit is configured as a switch K 1 , switch K 2 and switch K 3 On-case based on the microcurrent I OUT1 Generates flow through the heating power transistor Q 4 current I IN , so that the heating power transistor Q 4 heats up, changing the temperature of the environment in which the bandgap reference circuit is placed.

Description

technical field [0001] Embodiments of the present disclosure generally relate to the field of semiconductor integrated circuits, and more particularly, relate to a semiconductor integrated circuit and a temperature drift compensation method for the semiconductor integrated circuit. Background technique [0002] Reference voltage sources play a very important role in analog signal processing systems and mixed signal processing systems, and are used to provide voltage references for other circuits in the system. For example, reference voltage sources are widely used in many semiconductor integrated circuits such as analog-to-digital converters (ADC), digital-to-analog converters (DAC), sensors, etc., and their accuracy and stability will directly affect the signal processing accuracy of these circuits, such as ADC Or the conversion accuracy of DAC, etc., the sensing signal accuracy of sensors, etc. How to design an accurate and stable reference voltage source has always been ...

AI Technical Summary

Problems solved by technology

[0007] Embodiments of the present disclosure provide a semiconductor integrated circuit and a temperature drift compensation method for a semiconductor integrated circuit, aiming to solve the above-mentioned problems and other potential problems existing in conventional bandgap reference temperature drift solutions

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