Transient enhancement circuit applied to full-integration LDO

A fully integrated, transient technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., to achieve the effect of simple circuit structure, ensuring stability, and reducing charging time

Inactive Publication Date: 2015-12-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the LDO output terminal is not connected with an off-chip capacitor, the compensation of the circui

Method used

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  • Transient enhancement circuit applied to full-integration LDO
  • Transient enhancement circuit applied to full-integration LDO
  • Transient enhancement circuit applied to full-integration LDO

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Such as figure 2 Shown is a transient enhancement circuit applied to a fully integrated LDO. The LDO main control loop includes three gain levels. The first level is an error amplifier with a two-level gain structure. The second level is a source follower. The third stage is the power tube output stage. The transient response is improved by inserting a source follower between the error amplifier and the power tube output stage. At the same time, a large transient current is provided through the current boost feedback circuit, and finally the power input stage is improved. the gate voltage.

[0020] The input stage of the error amplifier adopts a PMOS differential amplification structure, and the output stage adopts a common CS structure of NMOS amplification, and the error is guaranteed by connecting the Miller compensation capacitor C1 and the zero adjustment...

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Abstract

The invention discloses a transient enhancement circuit applied to a full-integration LDO. The transient induction situation of the LDO is obtained by detecting the transient voltage of an LDO error amplifier output node. When load current changes suddenly from low current to high current or from high current to low current, output voltage is descended or ascended, at the moment, feedback voltage of a loop changes as well, and thus the output transient voltage of an error amplifier changes. When the output node voltage of the error amplifier is far lower than the grid voltage of an adjusting pipe, a buffer stage inserted between the error amplifier and a transistor provides large drop-down current for the grid of the adjusting pipe. When the output node voltage of the error amplifier is far higher than the grid voltage of the adjusting pipe, the current boosts, a feedback circuit is started, and sufficient charging current is provided for the grid of the adjusting pipe, so that the breakover current is controlled to meet the load requirement, and the effect of lowering the output voltage overshooting is achieved. The simulation result indicates that the transient enhancement circuit can remarkably improve the load transient response ability of the LDO.

Description

technical field [0001] The invention relates to a transient enhancement circuit applied to a fully integrated LDO (Low Dropout Regulator, low dropout linear voltage regulator), belonging to the low dropout linear voltage regulator technology. Background technique [0002] As an important circuit module in the power management unit (PowerManagementUnit, PMU), the low-dropout linear regulator is widely integrated into the system on chip (System on Chip, SOC), digital chip, and high-performance analog-to-digital / digital-to-analog conversion chip. In the high-speed digital circuit using LDO as voltage regulator, the main frequency is getting higher and higher, which can reach several GHz at present. The instantaneous jump of the level in the digital circuit will cause the instantaneous jump of the current. If the load of the LDO is a digital circuit, the instantaneous jump of the load current will affect the output voltage of the LDO. [0003] The transient response of LDO inc...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 吴金王灿汪超陈浩郑丽霞孙伟锋
Owner SOUTHEAST UNIV
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