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Band-gap reference voltage source with high-order curvature compensation

A reference voltage source, curvature compensation technology, applied in the power supply field, can solve the problems of small temperature coefficient, power consumption and the minimum working voltage is not optimized enough, achieve low working voltage, good temperature stability and PSRR performance, reduce power consumption Effect

Inactive Publication Date: 2011-09-21
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

The high-order temperature compensation method proposed by Song et al. and Lee et al. can get a small temperature coefficient, but it is not optimized in terms of power consumption and minimum operating voltage

Method used

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  • Band-gap reference voltage source with high-order curvature compensation
  • Band-gap reference voltage source with high-order curvature compensation
  • Band-gap reference voltage source with high-order curvature compensation

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] The base-emitter voltage V of the NPN transistor biased in the forward active region BE The relationship with the collector current can be expressed by the following formula:

[0019] V BE (T)=V G0 -mV T -(η-ζ)V T lnT formula (1)

[0020] where m is a temperature-independent constant, ζ is the temperature-dependent order of collector current, V T is the thermal voltage kT / q, k is the Boltzmann constant, q is the charge carried by an electron, V G0 Is the bandgap voltage of silicon at 0°K, η=4-n, n is the temperature-dependent order of carrier mobility, η is usually between 3 and 4, and typically η is 3.54. V T The lnT term represents the V BE For higher-order nonlinearities with temperature, first-order compensation involves canceling out T-related terms, and higher-order compensation involves canceling out higher-order T-relate...

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PUM

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Abstract

The invention discloses a band-gap reference voltage source with high-order curvature compensation, which comprises a starting circuit, an auxiliary reference circuit, an index curvature compensation circuit, a logarithm curvature compensation circuit and a current superposed circuit. The reference voltage source disclosed by the invention acquires the index curvature compensation in a low-temperature area by the auxiliary reference circuit and the index curvature compensation circuit, and acquires the logarithm curvature compensation in a high-temperature area by the logarithm curvature compensation circuit, so that the temperature drift is efficiently reduced in the whole temperature range. The reference voltage source has better temperature stability and PSRR (power supply rejection ratio) property and can normally work under the condition that the input voltage is reduced to 1.6V. By using the band-gap reference voltage source, low temperature drift is realized while the circuit consumption is reduced and the working voltage is lower.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to the design of a bandgap reference voltage source. Background technique [0002] In many applications of analog circuits, digital circuits, and digital-analog hybrid circuits, accurate reference circuits play an important role due to their high precision and low temperature drift. The reference voltage needs to be stable over input voltage and temperature variations, and needs to be compatible with standard manufacturing processes. Now low voltage and low power consumption are two important performances that need to be considered in many system designs, especially for battery-powered products. [0003] The traditional bandgap reference circuit proposed by Widlar and Brokaw is the reference for first-order temperature compensation. Since V BE Due to the non-linear relationship with temperature, the temperature coefficient of a first-order temperature-compensat...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 周泽坤黄智朱培生王永春刘明亮明鑫张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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