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Variable-curvature compensated bandgap voltage reference source

A technology of voltage reference source and curvature compensation, which is applied in the field of power supply to meet the requirements of low power supply

Inactive Publication Date: 2013-06-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the existing bandgap voltage reference source, and propose a bandgap voltage reference source with variable curvature compensation

Method used

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  • Variable-curvature compensated bandgap voltage reference source
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  • Variable-curvature compensated bandgap voltage reference source

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Such as figure 2 As shown, the bandgap voltage reference source with variable curvature compensation of the present invention includes a starting circuit, a PTAT current generating circuit, and a high-order temperature compensation circuit, wherein the starting circuit is used to start the PTAT current generating circuit, and the PTAT current generating circuit is used for A PTAT current is generated, and the PTAT current is used to input to a high-order temperature compensation circuit. The high-order temperature compensation circuit generates a current with a high-order temperature characteristic and is superimposed on the PTAT current to obtain a reference voltage for variable curvature compensation.

[0024] Such as image 3 As shown, the high-order temperature compensation circuit includes PMOS transistors M5, M1, NMOS transistors...

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Abstract

The invention discloses a variable-curvature compensated bandgap voltage reference source, comprising a startup circuit, a PTAT current generating circuit and a high-order temperature compensation circuit, wherein the startup circuit is used to start the PTAT current generating circuit, the PTAT current generating circuit is used to generate a PTAT current which is inputted to the high-order temperature compensation circuit, and the high-order temperature compensation circuit is used to generate a current with high-order temperature characteristics. The current is superimposed with the PTAT current, so as to obtain the reference voltage. In the invention, high-order temperature compensation of the reference voltage is realized by the GSC technology, and the compensation order degree is changed along with the temperature change. The conventional first-order compensation mode is adopted under the low temperature condition, second-order compensation is realized under the medium temperature condition, and third-order compensation is achieved under the high temperature condition. The voltage reference source of the invention is capable of working normally when the power supply voltage is as low as 1.9V, satisfying the requirement of supplying power to a low power supply by an integrated circuit.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to the design of a voltage reference source (Voltage Reference). Background technique [0002] As an essential part of the integrated circuit, the voltage reference source provides a bias current and a reference voltage for the entire chip. The size of the bias current determines the power consumption of the entire chip. At the same time, in the chip, many error amplifiers and comparators use the reference voltage as the reference voltage. The stability of the voltage reference source determines the function of the chip to a large extent. The advantages and disadvantages of implementation and performance. [0003] The most commonly used voltage references are triode-based bandgap voltage references. Such as figure 1 As shown, due to the clamping effect of the error amplifier, making V X with V Y The voltages at the two points are basically equal, that is, V ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 周泽坤徐祥柱石跃明鑫张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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