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High-precision exponential type temperature compensation CMOS (Complementary Metal-Oxide-Semiconductor Transistor) band-gap reference circuit

A reference circuit and temperature compensation technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of insufficient bandgap reference accuracy and poor temperature compensation stability, and achieve high reference voltage and high precision. Effect

Active Publication Date: 2019-02-12
CHENGDU GANIDE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings in the prior art, the high-precision exponential temperature compensation bandgap reference circuit provided by the present invention solves the problems that the existing bandgap references have insufficient precision and poor temperature compensation stability

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  • High-precision exponential type temperature compensation CMOS (Complementary Metal-Oxide-Semiconductor Transistor) band-gap reference circuit
  • High-precision exponential type temperature compensation CMOS (Complementary Metal-Oxide-Semiconductor Transistor) band-gap reference circuit
  • High-precision exponential type temperature compensation CMOS (Complementary Metal-Oxide-Semiconductor Transistor) band-gap reference circuit

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Embodiment Construction

[0040] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0041] Such as image 3 As shown, a high-precision exponential temperature compensation CMOS bandgap reference circuit includes three PMOS transistors, three PNP transistors, five resistors and a four-input operational amplifier;

[0042] Among them, the drains of the PMOS transistor M1, the PMOS transistor M2 and the PMOS transistor M3 are all connected to the power supply, and their gates are all connected to the output t...

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Abstract

The invention discloses a high-precision exponential type temperature compensation CMOS (Complementary Metal-Oxide-Semiconductor Transistor) band-gap reference circuit. The circuit comprises three PMOS (P-channel Metal Oxide Semiconductor) transistors, three PNP type audions, five resistors and a four-input operational amplifier. On the basis of conventional first-order temperature compensation, an exponential type temperature compensation item relevant to current amplification coefficients beta of the audions is added to a reference voltage produced by the circuit provided by the invention, and is different from the first-order temperature compensation and second-order curvature compensation, thereby obtaining the reference voltage with higher precision.

Description

technical field [0001] The invention belongs to the technical field of bandgap reference design, in particular to a high-precision exponential temperature compensation CMOS bandgap reference circuit. Background technique [0002] The reference voltage source is a very important unit module circuit in CMOS integrated circuits. It can provide high-precision and high-stability reference voltages. It is widely used in various analog and digital systems. With the continuous development of mobile communication technology, the reference voltage Source modules are increasingly demanding. The design of the CMOS reference voltage source is basically based on the bandgap reference source technology. [0003] So far, there have been many implementations of high-precision CMOS bandgap references, and the more common ones are first-order temperature-compensated references (such as figure 1 shown) and second-order curvature compensation benchmarks (such as figure 2 As shown), the accur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 罗敏郑薇谭荣李林华
Owner CHENGDU GANIDE TECH