A voltage stabilizing circuit for compensating bandgap reference voltage shunting

Abstract

A voltage stabilizing circuit for compensating bandgap reference voltage shunting, including 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 difference between the collector current of PNP8 and the collector current of NPN5 is equal to the base current of NPN3 and the base of NPN4 The sum of the currents, the shunt of the reference voltage VREF from R8 and R9 is equal to 0, the output voltage VOUT will be completely obtained by multiplying the reference voltage VREF through R8 and R9, and the output voltage is not affected by the reference base current in the full temperature range of -40-150°C shunt effect.

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 a voltage regulator circuit designed with a traditional bandgap reference structure, it is generally 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 p...

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

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