High-order temperature compensation band gap reference circuit

A temperature compensation circuit and high-order temperature compensation technology, applied in the field of microelectronics, can solve problems such as high temperature coefficient and restrictions on the application of first-order bandgap reference circuits

Active Publication Date: 2016-07-27
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the PNP transistor emitter-base voltage V EB The temperature nonlinearity makes the first-order bandgap reference voltage have a higher temperature coefficient, which restricts the application of the first-order bandgap reference circuit in high-precision systems

Method used

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  • High-order temperature compensation band gap reference circuit

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Embodiment

[0038] A high-order temperature-compensated bandgap reference circuit, such as figure 2 As shown, it includes start-up circuit 1, bipolar bandgap reference circuit 2, piecewise linear temperature compensation circuit 3 and ΔV GS A temperature compensation circuit 4, wherein the start signal output terminal of the start circuit 1 is respectively connected to the start signal input terminal of the bipolar bandgap reference circuit 2 and ΔV GS The start signal input end of the temperature compensation circuit 4, the signal output end of the bipolar bandgap reference circuit 2 are respectively connected to the voltage signal input end of the start circuit 1 and the signal input end of the piecewise linear temperature compensation circuit 3 , the starting circuit 1 makes the bandgap reference circuit work normally, the bipolar bandgap reference circuit 2 generates a bandgap reference voltage with a low temperature coefficient, and the segmental linear temperature compensation circ...

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PUM

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Abstract

The invention provides a high-order temperature compensation band gap reference circuit. The high-order temperature compensation band gap reference circuit comprises a start circuit, a bipolar band gap reference circuit, a segmental linear temperature compensation circuit and a delta VGS temperature compensation circuit, wherein the start circuit ensures that the high-order temperature compensation band gap reference circuit works normally, the bipolar band gap reference circuit generates a band gap reference voltage of a low temperature coefficient, and a temperature segmental linear compensation voltage generated by the segmental linear temperature compensation circuit and a delta VGS temperature compensation voltage generated by the delta VGS temperature compensation circuit are added into the low-temperature coefficient band gap reference voltage generated by the bipolar band gap reference circuit, so that a high-order temperature compensation reference voltage is obtained, and the temperature coefficient of a band gap reference circuit output voltage is greatly decreased.

Description

technical field [0001] The invention relates to the technical field of microelectronics, in particular to a high-order temperature compensation bandgap reference circuit. Background technique [0002] The bandgap reference circuit is the basic module of many analog and digital-analog hybrid circuit systems, which provide a stable reference voltage for analog and digital-analog hybrid circuit systems, and its performance characteristics directly affect the performance characteristics of analog and digital-analog hybrid circuit systems. [0003] figure 1 A traditional first-order bandgap reference is given, the resistors R2 and R3 are exactly the same, the NMOS transistors M1 and M2 have the same width-to-length ratio, and the emitter area of ​​the PNP transistor Q2 is equal to the emitter area of ​​the PNP transistor Q1 Alpha times. The emitter-base voltage V of PNP transistor Q1 EB1 As the temperature decreases, the voltage across the resistor R2 where k is the Boltzman...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 周前能徐兰庞宇林金朝李红娟李国权李章勇王伟冉鹏
Owner CHONGQING UNIV OF POSTS & TELECOMM
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