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A current reference source circuit

A current reference source and circuit technology, applied in the field of current sources, can solve the problems of low precision and large chip area, and achieve the effect of solving low precision and large chip area

Active Publication Date: 2017-09-22
LAUNCH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a current reference source circuit, which aims to solve the problems of large chip area consumption and low precision in the existing current reference source circuit

Method used

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  • A current reference source circuit
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  • A current reference source circuit

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Embodiment Construction

[0015] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0016] The realization of the present invention is described in detail below in conjunction with specific accompanying drawing:

[0017] figure 1 The module structure of the current reference source circuit provided by an embodiment of the present invention is shown. For the convenience of description, only the parts related to this embodiment are shown, and the details are as follows:

[0018] In this embodiment, the current reference source circuit includes a startup module 10 , a mirror current module 20 and a reference current generation module 30 . Wherein, the reference current generating m...

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Abstract

The invention belongs to the technical field of current sources, and discloses a current reference source circuit. Due to adoption of the current reference source circuit which comprises a starting module, a mirror image current module and a reference current generating module, after the current reference source circuit is electrified, the reference current generating module is controlled by the starting module to work, offset voltage is generated from a second branch unit of the reference current generating module, first current flowing into a first branch unit is mirrored to a third branch unit by the mirror image current module so as to generate second current; the second current is equal to first current, third current is generated by the second branch unit according to the first current, the second current and the offset voltage, the third current is mirrored to the a fourth output end of the mirror image current module by the mirror image current module so as to output reference current, and the reference current is equal to the third current, so that the problems that a conventional current reference source circuit is large in consumed chip area and low in precision can be solved.

Description

technical field [0001] The invention belongs to the technical field of current sources, in particular to a current reference source circuit. Background technique [0002] The reference current source refers to the current source with high precision and low temperature coefficient used as the current reference of other circuits in the analog integrated circuit. As the key circuit unit of the analog integrated circuit, the current source is widely used in operational amplifiers, A / D Converter, D / A converter. Since the reference current source outputs current to other modules of the system, the accuracy of the reference current source directly affects the accuracy and stability of the entire system, and the main factor affecting the accuracy and stability of the reference current source is temperature. [0003] At present, in order to eliminate the influence of the reference current source due to temperature changes, the prior art is mainly realized by a bandgap reference sour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 刘均陆云
Owner LAUNCH TECH CO LTD