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Method for dynamic compensation of reference voltage and band-gap reference voltage source

A technology of reference voltage and dynamic compensation, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as large temperature drift, and achieve the effect of small reference voltage

Inactive Publication Date: 2008-07-23
VIMICRO CORP
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Problems solved by technology

[0018] The technical problem to be solved by the present invention is to propose a method for dynamically compensating the reference voltage and a bandgap reference voltage source, so as to solve the problem that the reference voltage of the bandgap reference voltage source in the prior art has relatively large temperature drift in a high-temperature working environment. Big problem, to ensure that the reference voltage changes minimally with temperature rise

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  • Method for dynamic compensation of reference voltage and band-gap reference voltage source
  • Method for dynamic compensation of reference voltage and band-gap reference voltage source
  • Method for dynamic compensation of reference voltage and band-gap reference voltage source

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] As shown in Figure 4, the CMOS bandgap reference voltage source 100 proposed by the present invention includes: a reference core circuit 110, which is used to generate a constant current as a reference current; a reference voltage output circuit 120, which utilizes a positive temperature coefficient element R 2 , and a NTC element Q 3 output a reference voltage V ref ; A curvature compensation circuit 130, and a start-up circuit 140, used to ensure that the voltage source 100 works reliably and prevents it from falling into a zero state.

[0031] The present invention dynamically compensates the reference voltage V ref method, as shown in Figure 3, first, in step S10, a basic current source I is provided 1 , where the base current I 1 It has positive temperature coefficient characteristics. Referring to Fig. 4, the reference core circuit 110 utilizes two ...

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Abstract

The invention relates to a CMOS band gap reference voltage source with a curvature compensation circuit, which comprises a start circuit, a reference core circuit, a curvature compensation circuit and a reference voltage output circuit, The invention uses the PTAT current to form a PTAT voltage on a resistance to check temperature change, wherein the current of ms1 mirror image forms the voltage V(P06) on RC2, while the voltage is in direct proportion with temperature, and the invention uses the exponent relation between the voltage difference VEB of QC2 emitter and base of BJT transistor and the collector current of BJT and the similar linear relation between the collector current and base current to form the dynamic compensation on reference voltage which converts the check voltage varying linearity along with temperature into the compensation current in exponent type.

Description

technical field [0001] The invention relates to a CMOS bandgap reference voltage source, in particular to a CMOS bandgap reference voltage source with a curvature compensation circuit and a method for dynamically compensating the reference voltage. Background technique [0002] In A / D and D / A converters, data acquisition systems and various measurement equipment, high-precision and high-stability reference voltage sources are required, and the accuracy and stability of the reference voltage source determine the working performance of the entire system . The voltage reference is mainly based on the positive V BE The voltage reference, voltage reference based on Zener diode reverse breakdown characteristics, bandgap voltage reference and other implementation methods, among which the bandgap reference voltage source has the advantages of low temperature coefficient, high voltage rejection ratio, low reference voltage, etc., so Has been widely used. [0003] A traditional CMO...

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Application Information

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IPC IPC(8): G05F3/24
Inventor 郑儒富
Owner VIMICRO CORP
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