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High-precision band-gap reference source

A reference source, high-precision technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., to achieve the effects of improving feedback accuracy, improving accuracy, and saving area

Inactive Publication Date: 2015-07-22
XIDIAN UNIV
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-precision bandgap reference source, which can effectively solve the above problems, and can realize second-order curvature compensation for the output reference voltage characteristics without increasing the complexity of the circuit. The reference voltage can output a high-precision reference current at the same time

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Embodiment Construction

[0010] In order to make the objects and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with examples. It should be understood that the following words are only used to describe one or several specific implementation modes of the present invention, and do not strictly limit the protection scope of the specific claims of the present invention.

[0011] The technical scheme that the present invention takes is as figure 1 As shown, a high-precision bandgap reference source circuit includes a main circuit module 20 , a starting circuit module 10 and an output current module 30 . Vref is the reference voltage output terminal of the bandgap reference source, Iref is the reference current output terminal of the bandgap reference source, and VB1 and VB2 are bias voltage output terminals. The main circuit module 20 is composed of transistors M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, resistors R1, R2, R3, R4, R5...

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Abstract

The invention relates to a high-precision band-gap reference source which comprises a body circuit module, an output current module and a starting circuit module. A band-gap reference source structure with the adjustable output reference voltage is adopted in the body circuit module, and the flexible reference voltage can be output. In addition, feedback precision is improved through an operational amplifier of a folded cascode structure, different temperature characteristics of different resistors are utilized, second-order compensation of the temperature characteristic of the reference voltage source is achieved in a resistor split mode, the circuit complexity is reduced, and the area is saved. In addition, a cascode current mirror is adopted in the output current module to improve the precision of the reference current, and the high-precision reference voltage and reference current are output at the same time.

Description

technical field [0001] The invention relates to the field of analog integrated circuits, in particular to a high-precision bandgap reference source. Background technique [0002] The reference source circuit is a very important type of circuit in analog circuits. Its function is to provide bias voltage or current for other analog circuits. The accuracy and stability of the reference source circuit greatly affect the performance of other circuits, and the bandgap The reference source is an important reference circuit, which is widely used because it can provide a reference voltage independent of temperature. The previous bandgap reference source circuit only realized the first-order temperature compensation. To realize the second-order curvature compensation, an additional circuit needs to be added, which increases the complexity and area of ​​the circuit; in addition, the previous bandgap reference voltage source has many It can only provide a high-precision reference volta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/567
Inventor 李迪朱樟明杨银堂
Owner XIDIAN UNIV
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