A high-order temperature-compensated reference source

Abstract

The invention relates to the technical field of analog integrated circuits, in particular to a high-order temperature compensation reference source. The reference source of the present invention includes a positive temperature coefficient current module, a negative temperature coefficient current module and a reference voltage generation module; the input terminals of the positive temperature coefficient current module and the negative temperature coefficient current module are connected to the power supply VIN; the output terminals of the positive temperature coefficient current module are connected to The first input end of the reference voltage generation module, the output end of the negative temperature coefficient current module are connected to the second input end of the reference voltage generation module, and the output end of the reference voltage generation module outputs a reference voltage. The beneficial effect of the present invention is that the output reference source has higher precision than the traditional bandgap reference source; and compared with the traditional high-order compensation bandgap reference source, the circuit structure of the high-precision reference source realized by the present invention is simpler , is less affected by the process. The invention is particularly applicable to bandgap reference circuits.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a high-order temperature compensation reference source based on mobility temperature characteristics. Background technique [0002] In the field of analog integrated circuit or mixed-signal integrated circuit design, the reference voltage source is a very important and commonly used module. It is often used in circuit systems such as ADC converters, DCDC converters, and power amplifiers. Its role is to provide a system for the system. Voltage references that are invariant to temperature and supply voltage. [0003] In precision measurement instruments and widely used digital communication systems, reference voltage sources are often used as the basis for system measurement and calibration. Therefore, the reference voltage source occupies a very important position in the analog integrated circuit, which directly affects the performance and precision...

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Problems solved by technology

However, realizing a high-precision bandgap reference source through these two methods usually requires a more complex circuit structure, which will result in a larger layout area, and the accuracy of the output reference source is easily affected by process drift.

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