Bandgap reference source with multiple point curvature compensation

A reference voltage source, curvature compensation technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problems of complex circuits, poor compensation effects, and increased manufacturing processes, and achieve low temperature coefficient and simple circuit structure. Effect

Inactive Publication Date: 2007-04-25
TSINGHUA UNIV
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Problems solved by technology

It can be seen that the essence of these methods is to control the triode emitter junction voltage V BE (T) A certain reference temperature point T in the entire temperature range r The high-order items of the Taylor expansion are compensated, and they often have the disadvantages of complex circuits, large occupied areas, and increased manufacturing processes to varying degrees.
In the article published by Wu Guoping in 2005 (see literature Wu Guoping, Huang

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  • Bandgap reference source with multiple point curvature compensation
  • Bandgap reference source with multiple point curvature compensation
  • Bandgap reference source with multiple point curvature compensation

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Embodiment Construction

[0042] The technical solution of the present invention to solve the technical problem is: the multi-point curvature compensation bandgap reference voltage source proposed by the present invention, as shown in FIG. 4 . The multi-point curvature compensation bandgap reference voltage source is based on the common first-order compensation reference voltage source circuit structure, adding some circuits (N 1 , P 1 , P 2 , P 3 , R 3 and R 4 ), and then an output reference voltage with more excellent temperature characteristics is obtained.

[0043] Current I in Figure 4 a and I b They are generated by two MOS tubes working in the sub-threshold region respectively. Among them, the PMOS tube P 1 The function is to give the transistor Q 1 emitter injection current, while the NMOS transistor N 1 The effect is from the transistor Q 2 The emitter takes current. It is still assumed that all the PMOS tubes in the figure have the same size, and the triode Q 2 The area of ​​each...

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Abstract

This invention belongs to band gap basic power field, which is characterized by adding two current branches on current power and dividing two triodes integration injection current and fetch current to change their temperature properties and to change output basic voltage temperature property to achieve three basic voltage local maximum points in whole work range to make the output voltage basic temperature first degree derivative as zero.

Description

technical field [0001] The technical field of direct application of the "bandgap reference voltage source for multi-point curvature compensation" is the occasion with higher precision requirements for the reference voltage. The proposed circuit is a class of bandgap voltage references that can provide lower temperature coefficient reference voltages. Background technique [0002] The reference voltage source (Voltage Reference) usually refers to an accurate and stable voltage source used as a voltage reference in the circuit. With the continuous increase of the scale of integrated circuits, especially the development of system integration technology (SOC), the reference voltage source has become an indispensable basic circuit module in large-scale, VLSI and almost all digital and analog systems. [0003] Precision and stable voltage references are required in a large number of integrated circuits and circuit units, such as digital-to-analog converters (DACs), analog-to-digi...

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Application Information

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IPC IPC(8): G05F3/08
Inventor 杨华中姜韬
Owner TSINGHUA UNIV
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