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High-precision low-drift integrated voltage reference source circuit

A reference source circuit, integrated voltage technology, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. The effect of low adjustment rate, high precision and strong driving ability

Inactive Publication Date: 2010-04-21
GUIZHOU UNIV
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  • Summary
  • 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 low-drift integrated voltage reference source circuit
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  • High-precision low-drift integrated voltage reference source circuit

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Embodiment Construction

[0033] Embodiments of the present invention: the present invention is made up of following modules:

[0034] 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 opening voltage of the B-E junction of these two tubes has △V 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 .

[0035] 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 BE junction voltages are added to ensure that the output transistor Q21 has a sufficiently hig...

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Abstract

The invention discloses a high-precision low-drift integrated voltage reference source circuit which comprises a PTAT generation circuit (1), a voltage booster circuit (2), a current feedback circuit (3), an overheating protection circuit (4), a heavy-current drive and overcurrent protection current (5), a power supply voltage distributing circuit (6) and an output drive and reverse connection protection circuit (7), wherein the PTAT generation circuit (1) is used for generating PTAT current; the voltage booster circuit (2) is used for boosting PTAT voltage and realizing the starting separation of the circuit; the current feedback circuit (3) is used for stabilizing output voltage and improving the temperature stability of the current of the circuit; the overheating protection circuit (4) is used for the overheating protection of an output pipe; the heavy-current drive and overcurrent protection current (5) is used for adjusting the output voltage of the output pipe during heavy-load current and the overcurrent protection of a transistor in a heavy-current drive circuit; the power supply voltage distributing circuit (6) is used for improving the DC power supply rejection characteristic of output reference voltage; and the reverse connection protection circuit (7) is used for reinforcing the drive capacity of an output reference and the reverse connection protection of the circuit.

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 Applications(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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