Ultra-low voltage CMOS threshold band-gap reference circuit

A reference circuit, ultra-low voltage technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as large temperature coefficient and limit low-voltage operation, meet the design requirements of low temperature drift coefficient, low power consumption, and meet the Effects of Power Design Requirements

Inactive Publication Date: 2016-09-21
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional bandgap voltage references such as figure 1 As shown, its disadvantage is mainly that the output voltage is

Method used

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  • Ultra-low voltage CMOS threshold band-gap reference circuit
  • Ultra-low voltage CMOS threshold band-gap reference circuit
  • Ultra-low voltage CMOS threshold band-gap reference circuit

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Embodiment Construction

[0036] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0037] refer to Figure 5 , the ultra-low voltage CMOS threshold bandgap reference circuit of the present invention is composed of a PTAT generating circuit, a threshold voltage generating circuit and a starting circuit.

[0038] refer to figure 2 , The PTAT generation circuit is mainly composed of three PMOS transistors MP2, MP3, and MP4, two PNP bipolar transistors Q1 and Q2, one operational amplifier OP1 and two resistors R1 and R2:

[0039] The gate terminal of MP2 is connected to the gate terminal of MP1, the drain terminal of MP1, the source terminal of MP9, the gate terminal of MP3, the gate terminal of MP4, and the output terminal of OP1, the source terminal of MP2 is connected to the power supply voltage, and the drain terminal of MP2 is connected to One end of R1 is connected to the same-inverting input end of OP1;

[0040] The gate termin...

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Abstract

The invention discloses an ultra-low voltage CMOS threshold bandgap reference circuit, which includes a PTAT generating circuit, a threshold voltage generating circuit and a starting circuit; the PTAT generating circuit includes three PMOS transistors MP2, MP3, and MP4, and two PNP transistors Q1 and Q2 Type bipolar transistor, OP1 an operational amplifier and two resistors R1, R2; the threshold voltage generation circuit includes four PMOS transistors MP5, MP6, MP7 and MP8, four NMOS transistors MN1, MN2, MN3 and MN4, OP2 An operational amplifier, R3 and a resistor; the startup circuit includes two PMOS transistors, MP1 and MP9. Compared with the traditional bandgap reference source, the output reference source in the present invention can work under ultra-low voltage conditions, thereby meeting the design requirements of low power consumption. At the same time, the circuit has a controllable output voltage, and compared with the traditional high-order compensation As for the bandgap reference source, the reference source realized by the present invention has a lower temperature drift coefficient, no special process requirements, and a simple structure.

Description

technical field [0001] The invention relates to an ultra-low voltage bandgap reference circuit, in particular to an ultra-low voltage CMOS threshold bandgap reference circuit, which belongs to the technical field of analog integrated circuits. Background technique [0002] The bandgap reference is an important circuit unit, which is widely used in the field of analog and hybrid integrated circuit design, such as ADC converters, DC / DC converters and power amplifiers. Its role is to provide the system with A stable DC voltage or current that is independent of supply voltage and temperature variations. In precision measuring instruments and widely used digital communication systems, reference voltage sources are often used as a reference for system measurement and calibration. Therefore, the reference voltage source occupies a very important position in the analog integrated circuit, which directly affects the performance and precision of the electronic system. Traditional ba...

Claims

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Application Information

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IPC IPC(8): G05F1/565
CPCG05F1/565
Inventor 李娅妮孙亚东朱樟明杨银堂王旭
Owner XIDIAN UNIV
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