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Current mode bandgap reference voltage source with subthreshold current compensation function

A sub-threshold current and reference voltage source technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problem of no compensation in the low temperature section, and achieve the effect of flexible design, simple structure and small footprint

Active Publication Date: 2014-09-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only compensates the high temperature section in the temperature range, and does not compensate the low temperature section in the temperature range

Method used

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  • Current mode bandgap reference voltage source with subthreshold current compensation function
  • Current mode bandgap reference voltage source with subthreshold current compensation function
  • Current mode bandgap reference voltage source with subthreshold current compensation function

Examples

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Embodiment Construction

[0053] as attached image 3 As shown, the current mode bandgap reference structure of the subthreshold current compensation of the present invention includes a bandgap reference core circuit, a first MOS tube subthreshold current compensation circuit and a second MOS tube subthreshold current compensation circuit, and a bandgap reference core circuit and figure 2 The structure of the current mode bandgap reference circuit in the prior art is exactly the same. Including operational amplifier, PMOS tube MP1, PMOS tube MP2, PMOS tube MP3, PNP tube Q1, PNP tube Q2, resistor R1, resistor R2, resistor R3, resistor R4, the non-inverting input of the operational amplifier is connected to the drain of the PMOS tube MP2 , the inverting input terminal of the operational amplifier is connected to the drain of the PMOS transistor MP1, the gate of the PMOS transistor MP1, PMOS transistor MP2 is connected to the gate of the PMOS transistor MP3 and connected to the output terminal of the op...

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Abstract

Disclosed is a current mode bandgap reference voltage source with a subthreshold current compensation function. On the basis of an existing bandgap reference core circuit, a first MOS (metal oxide semiconductor) transistor subthreshold current compensation circuit and a second MOS transistor subthreshold current compensation circuit are added, subthreshold current of an NMOS transistor and a PMOS transistor are compensated to reference current through the two subthreshold current compensation circuits, the index change relation of the subthreshold current is utilized to compensate nonlinearity of traditional reference current, output bandgap reference current is enabled to be compensated within a wide temperature range, output bandgap reference voltage and temperature variations slow down, and accordingly temperature coefficient of the reference voltage is lowered greatly.

Description

technical field [0001] The invention relates to a bandgap reference voltage source, in particular to a current-mode bandgap reference voltage source with sub-threshold current compensation, which belongs to the technical field of integrated circuits. Background technique [0002] Bandgap reference voltage sources are widely used in the design of analog integrated circuits or digital-analog mixed signals, such as digital-to-analog converters (DAC), analog-to-digital converters (ADC), DC-DC voltage converters (DC-DC), AC-DC voltage converters (AC-DC), linear regulators, switching regulators, temperature sensors, rechargeable battery chip circuits, etc., which provide voltage references and current references for the system, which play a vital role in system performance role. The continuous development of integrated circuits, especially the increasing demand for low-voltage applications such as PDAs, cameras, notebooks, etc., makes the requirements for the accuracy and stabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/565
Inventor 孙伟锋黄泽祥张允武祝靖陆生礼时龙兴
Owner SOUTHEAST UNIV
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