Low-dropout voltage stabilizing circuit and method thereof

A low-dropout voltage regulator, circuit technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problem that LDO circuits cannot meet low output noise and high PSRR at the same time, and achieve voltage linear voltage regulation output, The effect of low output noise

Active Publication Date: 2020-02-14
VERISILICON MICROELECTRONICS SHANGHAI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a low dropout voltage regulator

Method used

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  • Low-dropout voltage stabilizing circuit and method thereof
  • Low-dropout voltage stabilizing circuit and method thereof
  • Low-dropout voltage stabilizing circuit and method thereof

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[0035] The following describes the implementation of the present invention through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0036] See Figure 1 to Figure 5 . It should be noted that the illustrations provided in this embodiment only illustrate the basic idea of ​​the present invention in a schematic manner, although the illustrations only show the components related to the present invention instead of the actual implementation of the number, shape and For size drawing, the shape, quantity, and proportion of each component can be changed at will during actual impl...

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Abstract

The invention provides a low-dropout voltage stabilizing circuit and a method thereof. The circuit comprises a bias voltage generation circuit, a voltage stabilizing loop output circuit, and a PSRR compensation circuit. The bias voltage generation circuit is used for generating a bias voltage and realizing the bias voltage output of low output noises based on RC filtering. The voltage stabilizingloop output circuit connected to the bias voltage generation circuit is used for generating an output voltage according to the bias voltage and adjusting the output voltage based on a feedback loop inthe voltage stabilizing loop output circuit to keep the constant output voltage. The PSRR compensation circuit connected to the voltage stabilizing loop output circuit is used for collecting disturbance on the power supply, processing the collected disturbance signal, feeding back the processed signal to a grid terminal of an MOS tube connected between a power supply voltage and a voltage outputnode in the voltage stabilizing loop output circuit, so that a source terminal and a grid terminal of the MOS tube change synchronously to realize PSRR compensation. Therefore, a problem that the existing LDO circuit cannot meet the requirements for low output noise and high PSRR at the same time is solved.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and in particular relates to a low-dropout voltage stabilizing circuit and a method thereof. Background technique [0002] Power management circuits are widely used in various portable electronic devices. With the improvement of chip integration, most single-chip SOCs use multiple on-chip voltage regulators, and the voltage regulators can be DC-to-DC power supplies, or low-dropout voltage regulators. Linear voltage regulator LDO; among them, LDO can supply power for each sub-module independently. This power supply scheme can not only meet the noise voltage requirements of the sub-module, but also optimize the circuit performance of the sub-module by customizing the power supply, and reduce the gap between different modules. Crosstalk from power supplies. [0003] In order to improve efficiency, the power supply of LDO usually comes from DCDC, and the output of DCDC usually has ripples in diffe...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 曹魏栋蒋祥顺曾毅钱哲弘
Owner VERISILICON MICROELECTRONICS SHANGHAI
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