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High-order temperature compensation band-gap reference circuit free of bipolar transistors

A high-order temperature compensation, bipolar transistor technology, applied in the field of microelectronics, can solve the problems of high temperature coefficient of output voltage, low power supply rejection ratio, application limitation, etc.

Active Publication Date: 2017-05-31
重庆医之舟信息科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the output voltage of the traditional first-order bandgap reference circuit has the disadvantages of high temperature coefficient and low power supply rejection ratio, so the application of the traditional first-order bandgap reference circuit in high-precision systems is greatly limited

Method used

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  • High-order temperature compensation band-gap reference circuit free of bipolar transistors
  • High-order temperature compensation band-gap reference circuit free of bipolar transistors
  • High-order temperature compensation band-gap reference circuit free of bipolar transistors

Examples

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Effect test

Embodiment

[0044] A high-order temperature-compensated bandgap reference circuit without bipolar transistors, such as figure 2 As shown, it includes a pre-regulator circuit 1, a first-order bandgap reference circuit 2, a temperature segment compensation circuit 3 in a low temperature region, a temperature segment compensation circuit 4 in a high temperature region, and a start-up circuit 5;

[0045] Wherein the voltage signal output terminal of the pre-regulator circuit 1 is respectively connected to the working power supply voltage input terminal of the first-order bandgap reference circuit 2, the temperature segment compensation circuit 3 in the low temperature region, and the segment compensation circuit 4 in the high temperature region, The signal output ends of the first-order bandgap reference circuit 2 are respectively connected to the signal input ends of the pre-regulator circuit 1, the temperature segment compensation circuit 2 in the low temperature region, and the segment com...

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Abstract

The invention provides a high-order temperature compensation band-gap reference circuit free of bipolar transistors. The high-order temperature compensation band-gap reference circuit free of the bipolar transistors comprises a front adjuster circuit, a first-order band-gap reference circuit, a low-temperature zone temperature sectional compensation circuit, a high-temperature zone temperature sectional compensation circuit and a starting circuit; a first-order band-gap reference voltage is obtained by adopting a negative-temperature-coefficient voltage VCTAT produced by a grid-source voltage of a sub-threshold NMOS (N-channel metal oxide semiconductor) transistor and a positive-temperature-coefficient voltage VPTAT produced by difference between grid-source voltages of two sub-threshold NMOS transistors, low-temperature zone temperature sectional compensation voltages (VNL1 and VNL2) and high-temperature zone temperature sectional compensation voltages (VNL3 and VNL4) are introduced into the first-order band-gap reference voltage produced by the first-order band-gap reference circuit, a band-gap reference voltage with low temperature coefficient is obtained, and a power supply rejection ratio of band-gap reference is increased with a front adjuster technology, so that the high-order temperature compensation band-gap reference circuit free of the bipolar transistors is obtained.

Description

technical field [0001] The invention relates to the technical field of microelectronics, in particular to a high-order temperature compensation bandgap reference circuit without a bipolar transistor. Background technique [0002] The bandgap reference circuit is an important module in the digital circuit system and the analog circuit system. The performance of the bandgap reference circuit directly affects the overall performance of the digital or analog circuit system. The main technical index of the bandgap reference circuit is the temperature coefficient (TC, Temperature Coefficient) and Power Supply Rejection Ratio (PSRR, Power Supply RejectionRatio), so the output voltage of the high-performance bandgap reference has the characteristics of low temperature coefficient and high power supply rejection ratio. [0003] The bandgap reference circuit is widely used in various circuit systems because of its low temperature coefficient and high precision of the output voltage in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 周前能朱令李红娟林金朝程飞鸿王良才李国权庞宇
Owner 重庆医之舟信息科技有限公司
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