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Low-temperature drift current source reference circuit

A reference circuit, low-temperature drift technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of large temperature drift and complex structure of current sources, reduce chip area, reduce circuit complexity, improve The effect of stability

Active Publication Date: 2018-08-31
NO 24 RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides a low-temperature drift current source reference circuit to solve the problem that the temperature-independent current source has a large temperature drift and a complicated structure

Method used

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Embodiment Construction

[0024] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the following describes the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings For further detailed explanation.

[0025] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be Directly connected or indirectly connected through an intermediary, those skilled in the art can understand the specific meanings of the above terms according to specific situations.

[0026] see figure 1 , is a ...

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Abstract

The invention provides a low-temperature drift current source reference circuit, which comprises a current generating circuit, a starting circuit, a mirror circuit and a bias current source, wherein the bias current source supplies bias current to the starting circuit and the mirror circuit; the starting circuit supplies a start signal to the mirror circuit after receiving the bias current to control the mirror circuit to start; after started, the mirror circuit supplies the bias current to the current generating circuit; after receiving the bias current, the current generating circuit makes use of transistors with the same material and different emitter areas, and calculate the difference of the emitter junction voltages on each transistor to generate low-temperature drift current and provide the low-temperature drift current to the mirror circuit, and the low-temperature drift current is output the mirror circuit in mirror mode. The circuit has smaller temperature drift, simpler circuit structure and smaller chip area.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and in particular relates to a low-temperature drift current source reference circuit. Background technique [0002] In the field of analog integrated circuits, the current source has been widely used. It provides bias current for each module and affects the performance of each module of the chip. Usually, we want to generate a constant current independent of supply voltage, process and temperature. In most applications, the required temperature relationship takes one of three forms: [0003] 1) Proportional to absolute temperature [0004] 2) Inversely proportional to absolute temperature [0005] 3) independent of temperature [0006] Temperature-independent current sources meet the needs of most analog integrated circuits and are therefore widely used. To obtain a temperature-independent current source, it is usually necessary to first generate a temperature-independent reference voltag...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 李鹏梁盛铭孙毛毛苟超朱哲序王菡陈波刘一杉罗凯
Owner NO 24 RES INST OF CETC
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