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Band-gap reference circuit with temperature compensation function

A reference circuit and temperature compensation technology, applied in the field of microelectronics, can solve the problems of large temperature coefficient, restrict the application of first-order bandgap reference circuit, etc., and achieve the effect of small temperature coefficient and small reference voltage

Active Publication Date: 2014-06-18
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, since V BE The nonlinearity of the first-order compensated bandgap reference voltage has a large temperature coefficient, which restricts the application of the first-order bandgap reference circuit in high-precision low temperature coefficient systems.

Method used

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  • Band-gap reference circuit with temperature compensation function
  • Band-gap reference circuit with temperature compensation function
  • Band-gap reference circuit with temperature compensation function

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0030] Such as figure 2 , image 3 As shown, a bandgap reference circuit with temperature compensation, the start signal output end of the start circuit 1 is respectively connected to the start signal input ends of the first-order bandgap reference circuit 2 and the high-order temperature compensation circuit 3; The current signal output terminal of the first-order bandgap reference circuit 2 is connected to the current signal input terminal of the high-order temperature compensation circuit 3 . The start-up circuit 1 is used to make the temperature compensated bandgap reference circuit work normally, the first-order bandgap reference circuit 2 generates a bandgap reference voltage with a low temperature coefficient, and the high-order temperature compensation circuit 3 is used to control the The first-order bandgap reference circuit 2 performs temperature...

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Abstract

The invention discloses a band-gap reference circuit with a temperature compensation function, and belongs to the technical field of microelectronics. By means of the band-gap reference circuit with the temperature compensation function, segmented current INL and current IP11 directly proportional to temperature T1.5 are added to the traditional first-order band-gap reference circuit, and namely the leakage current of a PMOS tube MP7 in a high-order temperature compensation circuit and the leakage current of a PMOS tube MP11 in the high-order temperature compensation circuit are added to a resistor R5 to achieve high-order temperature compensation so as to obtain a reference voltage. Due to the adoption of the technology, the reference voltage with the small temperature coefficient can be obtained.

Description

technical field [0001] The invention belongs to the technical field of microelectronics, in particular to a bandgap reference circuit with temperature compensation. Background technique [0002] Bandgap reference circuits are widely used in analog integrated circuits and hybrid integrated circuit systems, such as data converters, power management and oscillators, etc. Its main function is to provide stable reference voltage or current for other units in the system, and its temperature coefficient (TC, Temperature Coefficient) largely determines the performance of the system. [0003] Such as figure 1 As shown, the traditional bandgap reference circuit is based on the voltage V across the base and emitter of the NPN transistor with a negative temperature coefficient BE and a thermal voltage with a positive temperature coefficient The principle of linear superposition, where k is the Boltzmann constant, T is the absolute temperature, and q is the electron charge. [0004]...

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Application Information

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IPC IPC(8): G05F1/567
Inventor 周前能李云松林金朝庞宇李红娟李章勇李国权
Owner CHONGQING UNIV OF POSTS & TELECOMM