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Circuit and method for achieving low pressure and high precision of reference voltage source

A reference voltage source, reference voltage technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of low accuracy, unsuitable low-voltage systems, etc., to reduce the impact of output voltage accuracy, accelerate the start-up speed, The effect of reducing system gain

Inactive Publication Date: 2016-08-17
FUZHOU FUDA HISI MICROELECTRONICS
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a design method for realizing low voltage and high precision of the reference voltage source, so as to solve the problems of low precision and unsuitability for low voltage systems existing in the existing structure.

Method used

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  • Circuit and method for achieving low pressure and high precision of reference voltage source
  • Circuit and method for achieving low pressure and high precision of reference voltage source
  • Circuit and method for achieving low pressure and high precision of reference voltage source

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Embodiment Construction

[0017] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings and specific embodiments.

[0018] Such as figure 2 As shown, a circuit that realizes low voltage and high precision of the reference voltage source includes a bandgap core circuit, a start-up circuit and a low-threshold source follower circuit; the low-threshold source follower circuit is used to ensure that the reference output of the bandgap core circuit is under low voltage It can also work stably; the start-up circuit monitors the output reference voltage of the bandgap core circuit, thereby eliminating the overshoot phenomenon of the output voltage and ensuring the stable output of the reference voltage; the bandgap core circuit includes the first triode Q1 and the second Transistor Q2; the bases and collectors of the first triode Q1 and the second triode Q2 are all short-circuited; the emitter of the first PNP transistor Q1 is respec...

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Abstract

The invention relates to a circuit and a method for achieving low pressure and high precision of a reference voltage source. According to the technical scheme, a depletion-mode NMOS (N-channel metal oxide semiconductor) tube with a low threshold value and a starting circuit for real-time monitoring are introduced on a band gap core circuit, output of an error amplifier is connected with a source following tube NMOS and then supplies current to Q1s and Q2s, system gain is reduced, influences of offset voltage on precision of output voltage are reduced, and the system stability is improved; further, the source following tube NMOS adopts the depletion-mode NMOS tube, the pressure difference between power voltage and reference voltage is reduced, and accordingly, the structure can work in a low-voltage system; further, the starting circuit monitors the reference output voltage in real time, the overshoot phenomenon of the output voltage is eliminated, and quick and stable output of reference voltage is guaranteed.

Description

technical field [0001] The invention relates to the field of bandgap reference voltage sources in integrated circuits, in particular to high-precision reference voltage sources in low-voltage operating modes. Background technique [0002] Because its output is not affected by the power supply voltage and temperature, the bandgap reference voltage source can provide reference voltage for other modules in the system, so it is widely used in analog integrated circuits or digital-analog hybrid circuits. At present, electronic systems tend to be designed with low voltage, low power consumption and high precision. For high-precision system design, the accuracy and stability of the bandgap reference voltage source determine the quality of the system performance; for low-voltage operating systems, the output of the bandgap reference voltage source is required to be stable at a lower power supply voltage. [0003] The basic generation method of the reference voltage source is to use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/562
Inventor 黄淑燕阴亚东江典棋温文颖陈愿勇
Owner FUZHOU FUDA HISI MICROELECTRONICS
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