Low-dropout regulator with high-power-supply-rejection-ratio characteristic

A technology with low dropout linearity and high power supply rejection, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve the problem of low power supply rejection, and achieve the effects of reducing equivalent resistance, high efficiency, and low noise

Inactive Publication Date: 2014-12-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a low dropout linear regulator with high power supply rejection ratio to solve the problem that the power supply rejection in the high frequency band is relatively low in the current low dropout linear regulator

Method used

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  • Low-dropout regulator with high-power-supply-rejection-ratio characteristic
  • Low-dropout regulator with high-power-supply-rejection-ratio characteristic
  • Low-dropout regulator with high-power-supply-rejection-ratio characteristic

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Embodiment Construction

[0015] The present invention is described in detail below in conjunction with accompanying drawing

[0016] The principle of traditional low dropout linear regulator circuit, such as figure 1 As shown, the structure adjusts the current of the NMOS transistor MNA1 through the error amplifier, and controls the current on the diode-connected PMOS transistor MPA1, thereby adjusting the output current through the mirror image. Regardless of the influence of the error amplifier on the power supply rejection ratio, consider the influence of the parasitic capacitance at point A1, and calculate the small signal v in The gain coupled to the gate terminal A1 of the power transistor MP0 is:

[0017] A A 1 ( s ) = ...

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Abstract

The invention belongs to the technical field of electronic circuits, and particularly relates to a low-dropout regulator with the high-power-supply-rejection-ratio characteristic. Compared with an existing similar LDO, the low-dropout regulator is characterized in that the scheme that a voltage follower is additionally arranged at a power tube grid end is adopted, a low-frequency pole at the power tube grid end in a traditional LDO structure is separated into two high-frequency poles, feed-forward and feedback bandwidths are expanded, a dynamically-biased super source follower serves as output of the voltage follower, equivalent resistance at the power tube grid end under heavy loads is greatly reduced, and the inhibition performance of the low-dropout regulator to high-frequency power source noise interference is improved. A circuit structure of the low-dropout regulator maintains the high LDO efficiency, low noise and the simple circuit structure, and the power supply rejection ratio under the high-frequency condition is increased.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a low-dropout linear voltage regulator with high power supply rejection ratio characteristics. Background technique [0002] Low-dropout linear regulators have the advantages of low output noise, simple circuit structure, small chip area and small voltage ripple, and have become an important circuit in power management chips. Low-dropout linear regulators can provide power with low output ripple for noise-sensitive circuits such as analog circuits and radio frequency circuits, and because of their relatively simple structure and few peripheral components, they are widely used in SoCs. [0003] LDO is the core module in power management, which mainly provides low-noise power supply for analog circuits and radio frequency circuits, so the power supply rejection ratio is one of the key parameters of LDO. However, with the rapid development of integrated circ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/28
Inventor 明鑫董渊赵倬毅柯普仁王卓张波周泽坤
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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