Bandgap reference voltage source with wide input range and high power supply rejection ratio

A technology of high power supply rejection ratio and reference voltage source, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as poor frequency characteristics, poor practicability, and poor stability, and achieve reduced impact and strong noise Suppression ability, effect of strong power supply voltage suppression performance

Active Publication Date: 2017-07-18
SOUTHEAST UNIV +1
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Problems solved by technology

Compared with the cascode technology, although this technology does not increase the headroom voltage, but t

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  • Bandgap reference voltage source with wide input range and high power supply rejection ratio
  • Bandgap reference voltage source with wide input range and high power supply rejection ratio
  • Bandgap reference voltage source with wide input range and high power supply rejection ratio

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[0035] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples cited are only used to explain the present invention and not to limit the scope of the present invention.

[0036] Such as figure 2 , The present invention includes a voltage pre-regulation circuit and a bandgap reference core circuit. The voltage pre-regulation circuit includes a startup circuit 1, a bias and reference voltage generating circuit and an operational amplifier circuit. The output of the startup circuit 1 is connected to the bias and reference voltage generating circuit, The output of the bias and reference voltage generating circuit is connected to the operational amplifier circuit, and the operational amplifier circuit outputs a pre-regulated voltage V with high power supply rejection ratio and low temperature drift reg The bandgap reference core circuit is powered, and the output of the operational amplifier circuit is also...

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Abstract

The invention discloses a bandgap reference voltage source with wide input range and high power supply rejection ratio. The bandgap reference voltage source comprises a voltage preconditioning circuit and a bandgap reference nuclear circuit, wherein the voltage preconditioning circuit generates preconditioning voltage Vreg with low temperature excursion and the high power supply rejection ratio for supplying power to the bandgap reference nuclear circuit; the bandgap reference nuclear circuit comprises a starting circuit, a negative temperature coefficient current ICTAT generating circuit, a positive temperature coefficient current IPTAT generating circuit and a nonlinear current INL generating circuit; the nonlinear current INL generating circuit is used for compensating a high-order temperature component in the negative temperature coefficient current ICTAT generating circuit; current ICTAT, current IPTAT and current INL are superimposed to obtain reference voltage Vref with an approximate zero temperature coefficient by a current-voltage conversion circuit.

Description

technical field [0001] The invention belongs to the technical field of analog integrated voltage reference source circuits, in particular to a bandgap reference voltage source with a wide input range and high power supply rejection ratio. Background technique [0002] The reference voltage source converts the power supply voltage into a reference voltage that is approximately independent of temperature and power supply voltage, and its main function is to provide stable bias and reference voltages to other modules in the circuit. The stability of the reference voltage source is directly related to the working state of the circuit. In order to make the circuit system work normally in the case of changes in the external environment (such as operating temperature and power supply voltage), low temperature drift coefficient and high power supply voltage rejection ratio are the key points of the voltage reference source. key performance indicators. [0003] Traditional bandgap r...

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Application Information

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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 祝靖冷静禹括孙伟锋陆生礼时龙兴
Owner SOUTHEAST UNIV
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