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Low dropout linear regulator, method for improving stability of low dropout linear regulator and phase-locked loop

A low-dropout linear and voltage regulator technology, applied in the field of phase-locked loops, can solve problems such as poor noise performance

Active Publication Date: 2015-09-30
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a low-dropout linear voltage regulator, a method for increasing its stability, and a phase-locked loop to overcome the problem of poor noise performance of the existing low-dropout linear voltage regulator

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Embodiment Construction

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] see figure 2 , is a schematic structural diagram of an embodiment of the LDO of the present invention.

[0027] Such as figure 2 As shown, the LDO of the present invention may include: a reference voltage source 201 , an error amplifier 202 , an adjustment circuit 203 , a first compensation circuit 204 , a second compensation circuit 205 and a load 206 .

[0028]Wherein, the reference voltage source 201 is used to provide a reference voltage; the error amp...

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Abstract

The embodiment of the invention discloses a low dropout linear regulator, a method for improving the stability of the low dropout linear regulator and a phase-locked loop. The low dropout linear regulator comprises a reference voltage source, an error amplifier, an adjustment circuit, a load, a first compensating circuit and a second compensating circuit. The first compensating circuit is coupled with the adjustment circuit and used for adjusting a dominant pole and a secondary dominant pole of the low dropout linear regulator to adjust the phase margin. The second compensating circuit is used for adjusting the dominant pole of the low dropout linear regulator on the basis that the dominant pole and the secondary dominant pole of the low dropout linear regulator are adjusted by the first compensating circuit, further increasing the secondary dominant pole to adjust the phase margin and adjusting the gain bandwidth product of the low dropout linear regulator. By means of the low dropout linear regulator, the value of the gain bandwidth product and the dominant pole can be remarkably reduced, the secondary dominant pole can be increased, and therefore the error amplifier has the better noise performance.

Description

technical field [0001] The invention relates to the field of semiconductors, in particular to a low-dropout linear voltage regulator, a method for increasing its stability and a phase-locked loop. Background technique [0002] A Phase Locked Loop (PLL for short) refers to an automatic control closed-loop system composed of a Phase Detector, a Loop Filter, and a Voltage Control Oscillator (VCO). . Because PLL can complete the phase synchronization of two electrical signals, it is widely used in fields such as broadcast communication, frequency synthesis, automatic control and clock synchronization. Since power supply noise and fluctuations will affect the stability of the PLL, in actual use, it is usually necessary to use a low dropout linear regulator (LDO for short) to overcome the influence of power supply noise and fluctuations on the PLL, to ensure that the PLL and other noise-sensitive characteristics of the circuit. [0003] Such as figure 1 As shown, the existing ...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/575G05F1/56H03L7/08
Inventor 张津海蔡飞周盛华
Owner HUAWEI TECH CO LTD
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