Band-gap voltage reference source for high-order temperature compensation

A technology of high-order temperature compensation and voltage reference source, which is applied in the field of power supply to achieve the effect of improving power supply rejection ratio and linear adjustment performance

Inactive Publication Date: 2012-01-18
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • 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 volta

Method used

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  • Band-gap voltage reference source for high-order temperature compensation
  • Band-gap voltage reference source for high-order temperature compensation
  • Band-gap voltage reference source for high-order temperature compensation

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Embodiment Construction

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] The structural block diagram of the high-order temperature-compensated bandgap voltage reference source of the present invention is as follows: figure 1 As shown, it includes a start-up circuit, a first-order bandgap reference circuit, a high-order temperature compensation circuit, and a summation output circuit. The start-up circuit is used to provide a start-up bias voltage for the first-order bandgap reference circuit; the first-order bandgap reference circuit is used to generate a first-order bandgap reference voltage and a PTAT (Proportional To Absolute Temperature) current I PTAT ; The high-order temperature compensation circuit is used to generate a high-order temperature compensation current; the summation output circuit is used to convert the high-order temperature compensation current generated by the high-order temperature compe...

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Abstract

The invention belongs to the technical field of power supplies, and discloses a band-gap voltage reference source for high-order temperature compensation, which specifically comprises a starting circuit, a first-order band-gap reference circuit, a high-order temperature compensation circuit and a summation output circuit. The band-gap voltage reference source works out the reference voltage by summating the first-order band-gap reference voltage which is generated by the first-order band-gap reference circuit and the voltage which is converted from the high-order temperature compensation current which is generated by the high-order temperature compensation circuit, and improves the temperature coefficient of the band-gap reference voltage source by introducing index compensation; the designed circuit simultaneously adopts two feedback loops, so that the power supply rejection ratio (PSRR) and the linear adjustability are improved; and simultaneously, because the low-voltage working requirement is met, the voltage reference source has a very wide scope of application.

Description

technical field [0001] The invention belongs to the technical field of power supply, and particularly relates to the design of a voltage reference source (Voltage Reference). Background technique [0002] As an integral part of the integrated circuit, the voltage reference source provides 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. implementation and performance advantages and disadvantages. [0003] High-precision voltage references are required in analog, digital-analog hybrid, and even purely digital circuits, such as oscillators, phase-locked loops, data converters, and flash memory control circuits. The stability of the voltage reference source directly de...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 周泽坤欧雪春朱培生石跃明鑫张波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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