A multi-loop low-dropout linear regulator with fast transient response and high power supply rejection

By using a low-dropout linear regulator with a multi-loop design, combined with main feedback, adaptive ripple elimination, and current feedback loops, the problem of independent transient response and power supply rejection in existing technologies is solved, achieving fast response and high power supply rejection, and simplifying the power supply structure of the on-chip system.

CN117148906BActive Publication Date: 2026-06-23SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHEAST UNIV
Filing Date
2023-09-07
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing low-dropout linear regulators typically operate independently in terms of improving transient response and power supply rejection capabilities, resulting in high complexity of on-chip system power supply and large footprint. They also fail to effectively suppress overshoot and undershoot caused by load changes, as well as switching power supply ripple.

Method used

It adopts a multi-loop design, including a main feedback loop, an adaptive ripple elimination loop, and a current feedback loop. It is composed of differential circuits, summing circuits, buffers, current detection circuits, adaptive auxiliary amplifiers, and current mirrors to achieve fast transient response and high power supply rejection, thereby enhancing the ability to suppress load changes and switching power supply ripple.

Benefits of technology

This invention enables a single low-dropout linear regulator to simultaneously improve transient response and power supply rejection in an on-chip system, reducing the complexity and layout area of ​​the power supply module and improving the overall system performance.

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Abstract

The application provides a multi-loop low-dropout linear voltage regulator with fast transient response and high power supply rejection, which comprises a main feedback loop, an adaptive ripple elimination loop and a current feedback loop; the main feedback loop comprises a differential circuit, a summing circuit and a buffer; the adaptive ripple elimination loop comprises a first current detection circuit and an adaptive auxiliary amplifier, the first current detection circuit detects an output current to adjust the gain of the adaptive auxiliary amplifier; the current feedback loop comprises a second current detection circuit, a current mirror, a transistor MN11 and a capacitor C1; the application adopts a multi-loop design and comprehensively considers the transient response characteristics and the power supply rejection ratio of the linear voltage regulator; compared with a conventional low-dropout linear voltage regulator, the voltage regulator of the application is improved in the transient response and the power supply rejection ratio, has wider applicability and further improves the performance of a power supply module.
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