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High precision and low drift integrated voltage reference source circuit

A technology of reference source circuit and integrated voltage, which is applied in the direction of emergency protection circuit device, circuit device, emergency protection circuit device, etc. for limiting overcurrent/overvoltage, and can solve problems such as weak current driving ability

Inactive Publication Date: 2012-02-22
GUIZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the conventional CMOS process, the maximum withstand voltage between D-S of MOSFET is generally around 18V, and the current driving ability is not strong, while the maximum withstand voltage between C-E of bipolar transistors can reach 36V, even as high as 80V

Method used

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  • High precision and low drift integrated voltage reference source circuit
  • High precision and low drift integrated voltage reference source circuit
  • High precision and low drift integrated voltage reference source circuit

Examples

Experimental program
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Effect test

Embodiment Construction

[0039] Embodiments of the present invention: the present invention is made up of following modules:

[0040] PTAT current generating circuit 1, composed of resistor R 0 , R 2 , R 3 and NPN tube Q 1 , Q 2 composition. R 3 The resistance value is R 2 three times, the voltages across them are equal, so the flow through R 2 The current is flowing through R 3 Three times of that, resulting in the current flowing through the Q2 tube is flowing through the Q 1 Tube three times, the B-E junction opening voltage of these two tubes has ΔV BE =V T The deviation of ln3, this voltage deviation drops in the resistor R 0 On, a microcurrent (PTAT current) (V T ln3) / R 0 .

[0041] Voltage boost circuit 2, resistor R 1 and NPN tube Q 9 , Q 10 , Q 11 A diode structure composed of tubes. 4 times PTAT current flows through resistor R 1 The PTAT voltage is increased, and the two B-E junction voltages are added to ensure that the output transistor Q21 has a sufficiently high potent...

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Abstract

The invention discloses a high-precision low-drift integrated voltage reference source circuit, which comprises a PTAT generating circuit (1) for generating a PTAT current; a voltage boosting circuit (2) for boosting the PTAT voltage and realizing the startup isolation of the circuit ; The current feedback circuit (3) is used to stabilize the output voltage and improve the temperature stability of its current; the overheating protection circuit (4) is used for overheating protection of the output tube; the high current drive and overcurrent protection circuit (5) is used for It is used to adjust the output voltage of the output tube when the load current is large; it is used for the overcurrent protection of the transistor in the high current drive circuit; the power supply voltage distribution circuit (6) is used to improve the DC power supply suppression characteristics of the output reference voltage; the output drive and reverse connection The protection circuit (7) is used to strengthen the driving capability of the output reference and the circuit reverse connection protection.

Description

technical field [0001] The invention relates to an analog integrated reference voltage source circuit. Background technique [0002] Voltage references refer to high-precision, high-stability voltage sources used as voltage references. The ideal reference voltage is a quantity that has nothing to do with power supply, temperature, and load changes. The reference voltage source is an extremely important part of modern analog circuits, and it plays an important role in the application and development of high-tech analog electronic technology. In many analog circuits, such as digital-to-analog converters (DACs), analog-to-digital converters (ADCs), linear regulators, and switching regulators, high-precision, high-stability voltage references are required. Especially in precision measurement instruments and modern digital communication systems, integrated voltage reference sources are often used as the basis for system measurement and calibration. [0003] The continuous and s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/30H02H9/02H02H9/00
Inventor 马奎杨发顺丁召傅兴华林洁馨
Owner GUIZHOU UNIV
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