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Low-dropout power supply ripple suppression linear voltage regulator

A technology of linear voltage regulator and power supply ripple, which is applied in the direction of instruments, electric variable adjustment, control/regulation system, etc. It can solve the problems of unfavorable ripple suppression and achieve the effect of strengthening loop gain and strong suppression effect

Active Publication Date: 2020-06-02
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low loop gain brought about by too low dropout voltage is especially detrimental to ripple rejection

Method used

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  • Low-dropout power supply ripple suppression linear voltage regulator
  • Low-dropout power supply ripple suppression linear voltage regulator

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Embodiment 1

[0009] Embodiment 1: see figure 1 , figure 2 , a low-dropout power supply ripple suppression linear regulator, the voltage regulator includes a linear regulator main circuit and a power supply ripple suppression circuit, the linear regulator main circuit includes an error amplifier and a voltage feedback network, It is responsible for giving a stable DC output voltage and suppressing the low-frequency disturbance of the output voltage; the enhanced power supply ripple suppression circuit introduces a self-bias current multiplexing common-gate amplifier at the load end to compensate for the loop gain of the mid-high frequency band. Compared with the traditional structure, the ripple rejection ratio in the middle and high frequency bands is significantly enhanced. figure 1 Shown is the circuit structure diagram of the linear voltage regulator of the present invention, the concrete structure of the circuit is as follows: the concrete structure of the circuit is as follows: the ...

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Abstract

The invention relates to a low-dropout power supply ripple suppression linear voltage regulator, which is characterized by comprising a linear voltage stabilizer main body circuit and a power supply ripple suppression circuit, wherein the linear voltage stabilizer main body circuit is responsible for providing a stable direct-current output voltage and suppressing low-frequency disturbance of theoutput voltage, and the enhanced power supply ripple suppression circuit compensates for loop gain of medium and high frequency bands by introducing a self-bias current multiplexing common-gate amplifier at a load end. According to the low-dropout power supply ripple suppression linear voltage regulator, a rapid feedback loop is constructed at the load end, output voltage changes are dynamically monitored, and fluctuations of the output voltage is compensated by rapidly adjusting grid voltage of a driving tube.

Description

technical field [0001] The invention relates to a voltage stabilizer, in particular to a low-drop power supply ripple suppressing linear voltage stabilizer, which belongs to the technical field of high-precision analog circuits. Background technique [0002] The continued need for low power consumption continues to drive the development of RF and analog circuits to lower supply voltages. The reduction in voltage margin exacerbates the impact of power supply fluctuations on circuit performance. However, the output ripple of traditional DC-DC converters is large, which cannot guarantee the reliable operation of low-voltage circuits. Therefore, a ripple suppression linear regulator is required to connect the DC-DC and the core power supply to provide the circuit with a supply voltage as stable as possible. Limited by the number of ports, the on-chip voltage regulator is usually required to be fully integrated. However, the fully integrated LDO has only a limited filter capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 陈超
Owner SOUTHEAST UNIV
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