Low dropout linear regulator and control method

By using a basic regulator circuit and switching unit to store and swap the offset voltage in a low-dropout linear regulator, the problems of noise and excessive offset are solved, achieving a high-performance and low-power LDO design, reducing footprint and power-up time.

CN115562418BActive Publication Date: 2026-05-26CHENGDU LIGHT COLLECTOR TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHENGDU LIGHT COLLECTOR TECH
Filing Date
2022-10-12
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing low-dropout linear regulators (LDOs) suffer from excessive noise and offset in RF system-on-a-chip (SoC) applications, which affects module performance. Furthermore, existing filter circuits increase area and power-on setup time.

Method used

By employing a basic voltage regulator circuit and switching unit, the input offset voltage is canceled out by storing and interchanging the offset voltage and reference voltage, which reduces the use of filter circuits, noise interference, and area occupation.

Benefits of technology

It effectively reduces the impact of input offset voltage, improves LDO performance, reduces area footprint, and shortens power-on setup and settling time.

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Abstract

This invention provides a low-dropout linear regulator, including a base regulator circuit, a switching unit, and a load. One end of the load is connected to the output terminal of the base regulator circuit, and the other end of the load is connected to load ground. The switching unit is connected to the base regulator circuit. The switching unit is used to store an offset voltage and a reference voltage at a first input terminal of the base regulator circuit, and then swap the functions of the first and second input terminals of the base regulator circuit to cancel the offset voltage at the first input terminal, thereby reducing the impact of the input offset voltage. This invention also provides a control method for the low-dropout linear regulator.
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