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Band gap voltage reference circuit

A voltage reference and circuit technology, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problem of small output voltage accuracy of bandgap reference, and achieve the goal of improving power supply suppression, reducing sensitivity, and good suppression effect Effect

Active Publication Date: 2014-07-23
北京森海晨阳科技有限责任公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The original card noise and power supply noise in the existing bandgap voltage reference circuit have a great influence on the output voltage of the bandgap reference, making the accuracy of the output voltage of the bandgap reference smaller

Method used

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Embodiment Construction

[0038] In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0039] The embodiment of the present invention provides a bandgap voltage reference circuit, which can greatly reduce the influence of the card noise and the voltage noise on the output voltage, improve the accuracy of the reference voltage, take into account the chip area, and reduce the complexity of circuit design.

[0040] The bandgap voltage reference circuit of the present invention is as figure 2 shown in figure 1 On the basis of the circuit shown, the current mirror composed of two transistors is combined into one transistor to reduce the current error caused by mismatch; at the same time, the second NMOS transistor and the third NMOS transistor are added to reduce the influence of power supply noise on the output voltage , i...

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Abstract

The invention provides a band gap voltage reference circuit, and belongs to the field of analog circuits. The band gap reference circuit comprises a first PMOS transistor, a second NMOS transistor, a third NMOS transistor, a fourth PMOS transistor, a fifth PMOS transistor, a sixth PMOS transistor, a first PNP audion, a second PNP audion, a capacitor C, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and an operational amplifier. According to the technical scheme, the influence of local oscillator noise and voltage noise on output voltages can be lowered, the precision of a reference voltage is improved, meanwhile, the area of a chip is considered, and the design complexity of the circuit is reduced.

Description

technical field [0001] The invention relates to the field of analog circuits, in particular to a bandgap voltage reference circuit. Background technique [0002] Bandgap voltage reference circuits are widely used in analog and hybrid circuits, such as A / D converters, D / A converters, voltage tuners, voltmeters, ammeters and other test instruments and bias circuits. With the development of radio frequency integrated circuits and digital circuits and the promotion of bandgap reference sources in high-frequency circuit applications, power supply rejection has become an important criterion for reference sources in high-frequency and digital-analog hybrid circuit applications. The ability of the reference source inside the chip to suppress power supply noise in the entire frequency band will affect the performance of the entire chip in the entire frequency band, especially at high frequencies. [0003] The implementation circuit of the bandgap voltage reference source in the prio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 刘帘曦牛越刘术彬杨银堂
Owner 北京森海晨阳科技有限责任公司
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