Low dropout linear voltage regulator

A low-dropout linear and voltage regulator technology, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve problems such as unresponsive fast load transient switching, and achieve the purpose of increasing the input common-mode voltage range, reducing Effect of small amplitude, increased slew rate and bandwidth

Inactive Publication Date: 2012-03-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this regulator significantly solves the slew-rate-limited problem, this differential common-gate error amplifier has a limited input common-mode voltage range, and its transconductance and unity-gain bandwidth cannot respond at low bias currents. Fast Load Transient Switching

Method used

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Embodiment Construction

[0019] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0020] The structure diagram of the low dropout linear voltage regulator of the present invention is as follows figure 1 As shown, it includes power tube M0, buffer Buffer, first transconductance amplifier GmH, second transconductance amplifier GmL, current subtractor Σ and Miller compensation capacitor C3. The non-inverting input terminal of the buffer Buffer is connected to the external reference voltage source V REF , the inverting input terminates the output of the buffer. The non-inverting input terminal of the first transconductance amplifier GmH is connected to the output V of the LDO OUT , the inverting input terminal is connected to the output of Buffer. The non-inverting input terminal of the second transconductance amplifier GmL is connected to the output of Buffer, and the inverting input terminal is connected to the output V of...

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Abstract

The invention, belonging to the technical field of power supply management, discloses a low dropout linear voltage regulator, which comprises a power tube, a buffer, a first transconductance amplifier, a second transconductance amplifier, a current subtractor and a Miller compensation capacitor. The low dropout linear voltage regulator can remarkably increase slew rate and bandwidth of a common grid type error amplifier and enlarge the scope of the input common-mode voltage by three techniques of adaptive current bias, the current subtractor and capacitance coupling type dynamic charge and discharge, so that transient response speed of the linear voltage regulator is greatly increased and amplitude of the output voltage peak is reduced, meanwhile, good stability of a loop circuit is ensured.

Description

technical field [0001] The invention belongs to the technical field of power supply management, and in particular relates to the design of a low dropout linear regulator (LDO, Low Dropout Regulator). Background technique [0002] Low-dropout linear regulators can provide low output ripple power for noise-sensitive analog circuits and radio frequency circuits, and have a relatively simple structure and few peripheral components, so they are widely used in SoCs. In most applications, it is necessary to place an LDO with no output capacitor next to each circuit module, so that the optimization of the power supply of each circuit module can improve the overall performance of the system. [0003] For portable equipment, power efficiency is a key indicator for extending its battery life, so low quiescent current and low input-output voltage dropout are particularly important. However, because the tail current of the error amplifier limits the magnitude of the charging and dischar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 明鑫李强陈程周泽坤张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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