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High-precision voltage reference circuit

A voltage reference, high-precision technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as insufficient accuracy, and achieve the effect of reducing the temperature coefficient

Active Publication Date: 2011-08-31
WUXI CHIPOWN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the benchmark of this structure can conveniently adjust the value according to the needs, it can be applied to various occasions, but its temperature system is usually 10-20ppm / ℃, and it also faces the problem of insufficient accuracy.

Method used

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Experimental program
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Effect test

Embodiment Construction

[0019] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0020] figure 1 in, R 3 The current in V BE / R 3 . The virtual short characteristic of the op amp makes the potentials of points A and B equal, then R 1 The current in V BE / R 1 , R 2 Current is ΔV BE / R 2 , so the current flowing through M1 and M2 with the same width-to-length ratio is:

[0021] I = I 1 + I 2 = V BE R 1 + ΔV BE R 2 - - - ( 2 )

[0022] Under the condition of ignoring the temperature coefficient of resistance, in order to ensure that the current I has a zero temperature coefficient, it must be sat...

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PUM

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Abstract

The invention discloses a high-precision voltage reference circuit, which comprises a fist dynatron, a second dynatron, a fist MOS tube, a second MOS tube, a third MOS tube, an amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fourth MOS tube, the fifth MOS tube, a sixth MOS tube, a fifth resistor, a sixth resistor and a seventh resistor. The invention utilizes the principle that the PMO and NMOS tube threshold voltage temperature coefficient is a negative value, two kinds of positive temperature coefficient tiny current are respectively designed, the tinycurrent is respectively filled into or extracted out from the reference current in different temperature sections, and the precise temperature compensation is realized, so the temperature coefficientlow-voltage reference is obtained. The invention reduces the temperature coefficient of the reference circuit, the reference voltage value is far smaller than 1.25 V, and the high-precision voltage reference circuit can work in a low-voltage system.

Description

technical field [0001] The invention belongs to the technical field of analog integrated voltage reference circuits, and is a high-precision voltage reference circuit, which is used in various power supply ICs, ADCs and other systems, and can also be used as an independent IP core. Background technique [0002] At present, the performance requirements for analog ICs are getting higher and higher. It is hoped that they can provide high-precision voltage and current in a wide temperature range environment. At the same time, in order to save power consumption, the power supply voltage value is also required to be lower and lower. A reference with high accuracy and low voltage values ​​is required. [0003] There are currently two voltage references, one is a voltage-mode reference and the other is a current-mode reference. The voltage mode reference turns the diode PN junction into a voltage drop V BE (negative temperature coefficient), and the difference between the conducti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/30
Inventor 谢凌寒
Owner WUXI CHIPOWN MICROELECTRONICS