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Low-voltage difference linear constant voltage regulator with novel structure

A low-dropout linear voltage regulator technology, which is applied in the direction of instruments, control/regulation systems, and electric variable adjustment, can solve the problems of low-dropout linear voltage regulator performance impact and narrow output voltage range

Inactive Publication Date: 2009-04-29
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Either a narrow output voltage range or problems introduced by the use of a resistor network can negatively impact the performance of a low dropout linear regulator

Method used

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  • Low-voltage difference linear constant voltage regulator with novel structure
  • Low-voltage difference linear constant voltage regulator with novel structure
  • Low-voltage difference linear constant voltage regulator with novel structure

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Embodiment Construction

[0027] figure 2 A schematic structural diagram of an embodiment of the present invention is shown. The low dropout linear regulator with the structure provided by the present invention includes an error amplifier 101 , a buffer circuit 106 , a driving element 102 , a driving element bias circuit 108 and a compensation circuit 107 . In addition, the load capacitance equivalent series resistance compensation circuit 104 and the load impedance 105 are the same as those of the existing typical low-dropout linear regulators, and will not be described in detail. The error amplifier 101 adopts a rail-to-rail folded cascode operational transconductance amplifier structure; a buffer circuit 106 is added between the error amplifier 101 and the drive element 102, and the drive element receives the voltage signal from the buffer circuit, and controls the load current through the voltage signal change; no resistor divider feedback network is used, the output terminal of the driving eleme...

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Abstract

The invention relates to a low dropout linear regulator with a novel structure, which comprises an error amplifier, a driving component, a cushion circuit, a driving component biasing circuit for providing static current for the driving component, and a compensating circuit, wherein the error amplifier adopts a rail-to-rail folding common-source common-mesh operation transconductance amplifier structure, and the cushion circuit comprises a source follower circuit device and a conversion rate intensifier circuit. The regulator adopts the full feedback structure and the driving component biasing circuit to replace a resistor potential-divider network, saves the area of a domain, reduces the power consumption of the system, improves the precision and the stability of output voltage, and reduces the nonlinear distortion, and the like of the system; the error amplifier adopts a rail-to-rail folding common-source common-mesh operation transconductance amplifier structure, and realizes the rail to rail of input and output voltage; the conversion rate intensifier circuit increases the conversion rate of the system; the source follower circuit device and the compensating circuit change the position displacement of zero poles of the system, improves phase margin, and improves the stability of the system.

Description

technical field [0001] The invention belongs to the technical field of low-dropout linear voltage regulators, in particular to a low-dropout linear voltage regulator with a new structure. Background technique [0002] The low dropout linear regulator can provide a specific DC stable voltage, the voltage difference between the input and output of this voltage is small, and it is often used to provide the required power for the circuit. Many low-voltage products, such as notebook computers, mobile phones, mobile DVDs, MP3s, cameras, and other devices that use mobile batteries, require the use of low-dropout linear regulators. These portable electronic devices usually require low voltage drop and small quiescent current to increase the power efficiency and life of the battery. Therefore, low-dropout linear regulators are more and more widely used in various electronic devices, and with the wide application of low-dropout linear regulators, whether it is in design or in industr...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 江金光张提升刘经南
Owner WUHAN UNIV
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