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Low-temperature rinsing fast transient response high power supply rejection ratio band-gap reference voltage source

A technology with high power supply rejection ratio and reference voltage source, which can be used in adjusting electrical variables, control/regulating systems, instruments, etc., and can solve the problems of small loop gain and low X-point clamping accuracy.

Inactive Publication Date: 2018-08-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of this kind of reference source is that the current I is determined by the power supply, and it will change with the change of the power supply voltage; the feedback loop has only one single transistor Q3, the loop gain is small, and the clamping accuracy of point X is low

Method used

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  • Low-temperature rinsing fast transient response high power supply rejection ratio band-gap reference voltage source
  • Low-temperature rinsing fast transient response high power supply rejection ratio band-gap reference voltage source
  • Low-temperature rinsing fast transient response high power supply rejection ratio band-gap reference voltage source

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Embodiment Construction

[0014] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] figure 2 Shown is the overall circuit diagram of the low temperature drift fast transient response high power supply rejection ratio bandgap reference voltage source of the present invention. The bandgap reference is composed of a bandgap reference generating circuit, an error amplifier and a starting circuit. The error amplifier is composed of NPN transistors Q3, Q4, NMOS transistors MN1, MN2, MP3, MP4 and resistor R5. The function of the amplifier is to form a negative feedback loop between the voltage nodes A, B and the output node VREF to increase the loop gain, thereby clamping the voltages of the two points A and B to make them approximately equal. The gain of this amplifier is:

[0016] A V =g 3,4 ·{[g m1,2 ·(r CE3,4 ‖r o1,2 )]‖r o3,4} (1)

[0017] The supply voltage rejection ratio is:

[0018]

[0019]

[0020] (3) T is the loop gain...

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Abstract

The invention belongs to the technical field of analogue integrated circuits, and particularly relates to a low-temperature rinsing, fast transient response, high power supply rejection ratio band-gapreference voltage source. The circuit comprises three parts of a band-gap reference generation circuit, an error amplifier and a starting circuit. According to the band-gap reference voltage source provided by the invention, a band-gap reference voltage with zero-temperature coefficient is generated by using the base electrode-emitting electrode voltage VBE of negative temperature coefficients oftwo bipolar transistors and linear superposition of positive temperature coefficient difference delta-VBE of the VBE. Compared with the traditional structure, the band-gap reference voltage generatedby the circuit is lower in temperature coefficient, in addition the starting circuit is novel, and better transient response is realized.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, in particular to a bandgap reference voltage source with low temperature drift, fast transient response and high power supply rejection ratio. Background technique [0002] With the development of Moore's law for integrated circuits, integrated circuits are becoming more and more integrated, feature sizes are getting smaller, and power supply voltages are getting lower and lower, which puts forward higher requirements for chip performance and power consumption. At the same time, the bandgap reference is a part of the chip that provides a reference for the entire circuit, and its slight disturbance will seriously affect the stability of the entire system, resulting in large deviations. Therefore, the immunity of the bandgap reference to temperature and supply voltage is particularly important. When the temperature and power supply voltage fluctuate in a wide range, the output o...

Claims

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Application Information

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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 唐硕张国俊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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