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High-precision band-gap reference source circuit based on emitter current compensation

A technology of emitter current and compensation circuit, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., to achieve the effects of reducing influence, achieving compatibility, and simple structure

Active Publication Date: 2011-02-16
CHANGSHA JINGJIA MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The problem to be solved by the present invention is: aiming at the technical problems existing in the existing bandgap reference, the present invention provides a high-precision, low-offset reference voltage source design based on emitter current compensation and fully compatible with common CMOS technology

Method used

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  • High-precision band-gap reference source circuit based on emitter current compensation
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  • High-precision band-gap reference source circuit based on emitter current compensation

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Embodiment Construction

[0015] like figure 1 As shown, the circuit of the present invention can be divided into four parts: a start-up circuit, a bias circuit, a reference voltage generating circuit, and an emitter current compensation circuit. The function of the bias circuit is to provide gate bias voltage for the cascode transistors M1~M5 and M12 in the reference voltage generation circuit and the emitter current compensation circuit, so that they can work in the saturation region and improve the output impedance of the cascode transistors. , to enhance its ability to resist power interference. The reference voltage generation circuit is composed of PMOS transistors M1~M10, operational amplifier OP, resistors R1, R2, transistors Qa1, Qa2, Qa3, Qb1 and Qb2. Adding a cascode current mirror can increase the accuracy of the reference current source and effectively Increases the current source's ability to withstand voltage changes. But a problem with this circuit is the possibility of a deadlock sta...

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Abstract

The invention discloses a high-precision and low-maladjustment reference voltage source realized by utilizing a triode emitter current compensation technique. The high-precision and low-maladjustment reference voltage source comprises four circuits: a start-up circuit (1), a bias voltage generating circuit (2), a reference voltage generating circuit (3) and an emitter current compensation circuit (4), wherein the start-up circuit is mainly used for relieving a circuit deadlock state possibly generated when the circuit is powered on; the bias voltage generating circuit generates bias voltage required by reference; the reference voltage generating circuit outputs reference voltage close to a zero-temperature coefficient by utilizing a method of mutually offsetting the negative temperature coefficient and the positive temperature coefficient of a triode; and the emitter current compensation circuit is used for compensating the emitter current of the triode, thereby reducing the influence of operational amplification on reference output. The invention can effectively restrain the influence of the temperature and power voltage changes on the reference output voltage and simultaneously reduces the influence of the operational amplification on the reference output; moreover, the circuit is completely compatible with a common CMOS (Complementary Metal Oxide Semiconductors) process, and simultaneously, the invention has big output range, high precision and wide application range.

Description

technical field [0001] The invention mainly relates to the field of reference voltage source design of analog integrated circuits, in particular to a high-precision, low-offset bandgap reference voltage source circuit based on emitter current compensation. Background technique [0002] Voltage references are an important part of today's integrated circuits, and are widely used in digital, analog, and digital-analog hybrid circuits. Especially in such as random dynamic memory, A / D, D / A converter, all kinds of digital-analog hybrid IC is indispensable. Therefore, high-performance voltage reference sources with high power supply rejection ratio, low temperature drift, and CMOS process compatibility have become the focus of integrated circuit designers. [0003] At present, there are many kinds of reference voltage sources in integrated circuits, and bandgap reference is widely used in the industry due to its high precision. The forward voltage of the pn junction has a negativ...

Claims

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Application Information

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IPC IPC(8): G05F3/30
Inventor 蒋仁杰陈怒兴陈宝民石大勇谭晓强郭斌李俊丰
Owner CHANGSHA JINGJIA MICROELECTRONICS
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