Curvature Compensation Low Temperature Drift Bandgap Reference Voltage Source Circuit

Abstract

The implementation mode of the present application provides a curvature compensation low temperature drift bandgap reference voltage source circuit for generating a reference voltage. The curvature compensation low temperature drift bandgap reference voltage source circuit includes a start-up circuit, a first-order reference circuit and a higher-order curvature compensation circuit, the start-up circuit is used to provide start-up voltage for the voltage reference source circuit, so as to prevent the voltage reference source circuit from working in the zero state region, the first-order reference circuit is used to generate a low temperature coefficient reference voltage, and the high-order The curvature compensation circuit is used for performing high-order temperature curvature compensation on the first-order reference circuit. The technical solution of this application uses the method of multi-level PNP superposition to effectively reduce the influence of the input offset voltage and noise of the operational amplifier. The source temperature drift coefficient is effectively reduced.

Description

technical field [0001] The present application relates to a reference voltage source circuit, in particular to a curvature compensation low-temperature drift bandgap reference voltage source circuit. Background technique [0002] With the continuous advancement of integrated circuit technology, bandgap reference sources are more and more widely used in various electronic systems, such as temperature sensors, power regulators, digital-to-analog converters, analog-to-digital converters, and memory circuits. With the continuous upgrading of technology, the system's requirements for various performance indicators of the bandgap reference are also increasing. The bandgap reference provides a reference voltage for the entire system, and its performance will directly affect the performance of the entire system. Therefore, the output reference voltage is required to have a lower temperature coefficient and higher precision, that is, the circuit distribution range is relatively smal...

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Problems solved by technology

[0005] However, this circuit has the following disadvantages: 1. In the bandgap reference core circuit, the mismatch between the input transistors of the op amp will cause the input offset voltage of the op amp, resulting in V A , V B The voltages at two points are not exactly equal, and this offset voltage, after a certain proportional gain, will affect V ref The value of V has a certain influence, causing V ref The voltage is greatly discrete due to the influence of the process and the environment, so the accuracy of the circuit is low

In addition, the noise of the op amp will also affect the output voltage V ref 2. The offset voltage of the op amp generally has a certain drift coefficient with temperature, and this drift coefficient will affect V ref Produce a certain influence, so that the temperature drift coefficient of the output voltage increases

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