High order temperature supplementary band gap reference circuit

Abstract

The invention discloses a high order temperature supplementary band gap reference circuit, comprising a band gap reference main circuit, a feedback control loop and an output circuit, wherein the band gap reference main circuit consists of six PMOS tubes, two NMOS tubes, three resistances and two PNP triodes, the feedback control loop consists of two PMOS tubes, two NMOS tubes and two PNP triodes, and the output circuit consists of two PMOS tubes and four resistances. The circuit of the invention has lower temperature coefficient, higher power supply rejection rate as well as higher process stability.

Description

technical field [0001] The invention relates to a high-order temperature-compensated bandgap reference circuit, which belongs to the technical field of power supplies, and in particular to a high-order temperature-compensated bandgap reference circuit based on circuit operating state point control. Background technique [0002] With the further complexity of the circuit system structure, the requirements for the basic modules of analog circuits are getting higher and higher, such as A / D, D / A, phase-locked loop, and filter circuits, which require higher speed and higher precision. In these module circuits, a voltage or current reference circuit is generally required, which can provide the system with a voltage or current source that does not vary with temperature and power supply. Bandgap references have been widely used and researched because of their advantages such as low temperature coefficient, high power supply rejection ratio and compatibility with traditional CMOS pro...

AI Technical Summary

Problems solved by technology

However, the high-order compensation circuit is complex and the chip occupies a large area

In addition, in the existing various high-order compensation structures, the serious impact of process drift on system performance cannot be overcome. The maximum drift of the reference temperature coefficient reaches dozens of times, and its performance and process stability are not even as good as the corresponding one. The first-order linear compensation reference severely limits the application of high-order compensation technology. Due to the influence of the above factors, it is rarely used in actual use, especially in low-cost chips.

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