Band-gap reference voltage source circuit and electronic equipment

A technology of reference voltage source and reference voltage, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as limitations, and achieve strong anti-noise ability, low-voltage starting power supply ripple rejection ratio, and simple circuit structure Effect

Pending Publication Date: 2021-07-30
FITIPOWER INTEGRATED TECH SHENZHEN INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this circuit also has some disadvantages. For example, since the VREF voltage is process-dependent and the VREF node is high impedance, the bandgap voltage source circuit needs to add a buffer circuit to adjust the VREF voltage to the required voltage.
In addition, adding a snubber circuit will make the low voltage and high PSRR of this bandgap voltage source circuit limited by the snubber circuit

Method used

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  • Band-gap reference voltage source circuit and electronic equipment
  • Band-gap reference voltage source circuit and electronic equipment
  • Band-gap reference voltage source circuit and electronic equipment

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Embodiment Construction

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are part of the embodiments of the application, not all of them.

[0032] The term "and / or" in this application is an association relationship describing associated objects, indicating that there may be three relationships, for example, A and / or B, which may mean: A exists alone, A and B exist simultaneously, and There are three cases of B. The symbol " / " in this document indicates that the associated object is an or relationship, for example, A / B indicates A or B.

[0033] In the embodiment of the present application, terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. For example, the first...

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PUM

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Abstract

The invention provides a band-gap reference voltage source circuit and electronic equipment, the band-gap reference voltage source circuit comprises a starting circuit, an operation amplifier circuit and an output voltage circuit, wherein the starting circuit is used for providing reference voltage for the band-gap reference voltage source circuit to prevent the band-gap reference voltage source circuit from working in a zero state area; the operational amplifier circuit is electrically connected with the starting circuit and is used for generating working current for the output voltage circuit according to the reference voltage; and the output voltage circuit is electrically connected with the operational amplifier circuit and is used for receiving the working current and amplifying or reducing the reference voltage according to the working current in a preset proportion so as to obtain the reference voltage with the zero temperature coefficient. According to the embodiment of the invention, the reference voltage with a zero temperature coefficient can be generated, and the low-voltage starting circuit has the advantages of low-voltage starting, high power supply ripple rejection ratio and small area.

Description

technical field [0001] The present application relates to a reference voltage source circuit, in particular to a bandgap reference voltage source circuit and electronic equipment. Background technique [0002] With the continuous progress of integrated circuit technology, bandgap reference sources are more and more widely used in various electronic systems. The bandgap reference provides the reference voltage for the system, and its performance will directly affect the working performance of the entire system. Therefore, the output reference voltage is required to have a lower temperature coefficient and higher precision, that is, the circuit distribution range is relatively small, the noise is small, and the temperature coefficient is relatively small. [0003] figure 1 Shown is a self-biased bandgap voltage source circuit commonly used in power systems, in which the depletion-type NMOS transistor MD1 and NMOS transistor MN2 are connected in series, and the node between t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 姚钦峰蓝元刘
Owner FITIPOWER INTEGRATED TECH SHENZHEN INC
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