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LDO circuit with dynamic compensation and rapid transient response

A dynamic compensation and transient response technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as large output filter capacitors, achieve the effects of improving response speed, improving power supply rejection ratio, and ensuring stability

Active Publication Date: 2018-03-13
58TH RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. A large output filter capacitor is required

Method used

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  • LDO circuit with dynamic compensation and rapid transient response
  • LDO circuit with dynamic compensation and rapid transient response
  • LDO circuit with dynamic compensation and rapid transient response

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Embodiment Construction

[0047] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments . Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] The present invention will be further described below in conjunction with accompanying drawing.

[0049] The present invention proposes a method through: 1. By introducing a dynamic bias, the gain of the input stage and the pole-zero pair introduced by C1 in the multi-loop gain stage and the MOS resistor RMN3 working in the deep linear region are related to the load current IIload Correlation ensures the stability of the loop over t...

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Abstract

The embodiment of the invention relates to the technical field of analog integrated circuits, in particular to an LDO circuit with dynamic compensation and rapid transient response. The circuit comprises an input stage, a multi-loop gain stage, an output stage and a load stage. By introducing the dynamic bias mode, gain of the input stage, C1 in the multi-loop gain stage and a pole-zero doublet introduced by an MOS resistor RMN3 working in a deep linear region are related to load current ILoad, and the stability of loops within the whole load range is ensured. Meanwhile, due to the dynamic bias mode, the unity-gain bandwidth of the input stage becomes larger, and the power supply rejection ratio of the circuit is increased. In addition, MP6 and MN11 adopted in the multi-loop gain stage, sothat discharging of charges on an output cavity can be accelerated, and the circuit response speed during hopping from heavy load to light load is increased. Due to the MN9, discharging of charges ona power tube MP7 grid stray capacitor can be accelerated, and the response speed of the circuit during hopping from light load to heavy load is increased.

Description

Technical field [0001] The invention belongs to the field of electronic technology, relates to the technical field of analog integrated circuits, and specifically relates to an LDO (low voltage dropout linear regulator) circuit with fast response and dynamic compensation. Background technique [0002] Low dropout linear voltage regulators have a very wide range of applications and are used to provide a regulated, stable output power supply voltage. It is necessary to improve the performance of LDO in the operation of mobile power supplies such as mobile phones, cameras, tablets and laptops, which will help improve product service life and standby time. [0003] The traditional LDO circuit structure is as follows figure 1 shown. It consists of a first gain stage, a second gain stage and an output stage. In the first gain stage, R1 and C1 form a compensation network. MP4 is the output power tube, R4 represents the parasitic resistance on the output filter capacitor C2, R2 ...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 奚冬杰李现坤罗永波宣志斌
Owner 58TH RES INST OF CETC
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