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Voltage stabilizing circuit for compensating band-gap reference voltage shunt

A voltage regulator circuit and reference voltage technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as huge changes in base current shunt, poor control of output voltage accuracy, and large changes in triode magnification.

Active Publication Date: 2020-08-18
NANJING MICRO ONE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The base current shunt fluctuations of NPN3 and NPN4 seriously affect the accuracy of the output voltage. Affected by the fluctuation of the production process, the magnification of the triode changes greatly, especially the magnification of the full temperature -40-150°C changes drastically and doubles, resulting in base current shunting The change is huge, the change is doubled, and the output voltage accuracy control is poor
The impact is even greater in the field of low power consumption, the output of the full temperature range of -40-150 ° C cannot be controlled accurately, and the temperature coefficient is very poor

Method used

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  • Voltage stabilizing circuit for compensating band-gap reference voltage shunt
  • Voltage stabilizing circuit for compensating band-gap reference voltage shunt
  • Voltage stabilizing circuit for compensating band-gap reference voltage shunt

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Embodiment Construction

[0020] Such as figure 2 , the present invention includes horizontal PNP transistors PNP1, PNP2, PNP3, PNP4, PNP5, PNP6, PNP7, PNP8, PNP9, vertical transistors NPN1, NPN2, NPN3, NPN4, NPN5, NPN6, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, capacitor C1, bias current source I1. The resistors of R2, R3, R4, and R5 are identical, the tubes of PNP6, PNP7, PNP8, and PNP9 are identical, and the tubes of NPN5, NPN6 are identical, forming a high degree of matching. The collector currents of PNP6, PNP7, PNP8, and PNP9 are equal, and the collector currents of NPN5, NPN6 Equal, using the difference between the collector current of PNP8 and the collector current of NPN5 is equal to the sum of the base current of NPN3 and NPN4, the shunt of the reference voltage VREF from R8 and R9 is equal to 0, and VOUT will be completely passed by the reference voltage VREF through R8 , R9 doubles the voltage to get the output, and the output is not affected by the base current shunt of NPN3 and NPN4...

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Abstract

The invention discloses a voltage stabilizing circuit for compensating band-gap reference voltage shunt. The voltage stabilizing circuit comprises transverse PNP triodes PNP1, PNP2, PNP3, PNP4, PNP5,PNP6, PNP7, PNP8 and PNP9, and longitudinal triodes NPN1, NPN2, NPN3, NPN4, NPN5 and NPN6, resistors R1, R2, R3, R4, R5, R6, R7, R8 and R9, a capacitor C1 and a bias current source I1. The differencebetween the collector current of the PNP8 and the collector current of the NPN5 is equal to the sum of the base current of the NPN3 and the base current of the NPN4; reference voltage VREF is shuntedfrom R8 and R9 to be equal to 0, output voltage VOUT is completely obtained by the reference voltage VREF through voltage doubling of R8 and R9, and the output voltage is not affected by reference base current shunting within the full temperature range of-40 DEG C to 150 DEG C.

Description

technical field [0001] The invention relates to a voltage stabilizing circuit, in particular to a voltage stabilizing circuit for compensating bandgap reference voltage shunting, and belongs to the technical field of integrated circuits. Background technique [0002] When designing a voltage stabilizing circuit using a bandgap reference structure, it is generally hoped that the output will not be affected by the shunt of the reference voltage. The shunt of the reference voltage often changes greatly with the fluctuation of the process. power consumption, the shunt fluctuation of the reference voltage seriously affects the accuracy of the output voltage. figure 1 For the voltage regulator circuit designed with the traditional bandgap reference structure, it is usually expected that the output currents flowing through R8 and R9 are equal, and the output is not affected by the shunting of the base currents of NPN3 and NPN4. The base currents of NPN3 and NPN4 often vary with the...

Claims

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Application Information

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IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 于圣武张洪俞李宇
Owner NANJING MICRO ONE ELECTRONICS