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Low-noise low-dropout broadband ripple suppression linear voltage regulator

A linear voltage regulator, ripple suppression technology, applied in the direction of instruments, control/regulation systems, and electrical variables to achieve excellent ripple suppression effect, output noise reduction, and low output noise effects

Active Publication Date: 2020-05-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fully integrated LDO has only limited filter capacitance, and the suppression of ripple needs to be compensated by active means, so higher requirements are put forward for the bandwidth of the feedback loop.

Method used

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  • Low-noise low-dropout broadband ripple suppression linear voltage regulator
  • Low-noise low-dropout broadband ripple suppression linear voltage regulator
  • Low-noise low-dropout broadband ripple suppression linear voltage regulator

Examples

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Effect test

Embodiment 1

[0011] Embodiment 1: see figure 1 , a low-noise low-dropout wide-band ripple suppression linear regulator, the regulator includes a linear regulator main circuit and a broadband ripple suppression circuit in two parts, the linear regulator main circuit includes an error amplifier and a voltage feedback network , responsible for giving a stable DC output voltage and suppressing low-frequency disturbances of the output voltage. The broadband ripple suppression circuit monitors the change of the output voltage in real time, and dynamically compensates the output current by superimposing the rapidly changing control voltage on the gate of the drive tube to suppress At the same time, the ripple compensation circuit also greatly reduces the output noise at the mid-high frequency end.

[0012] The specific structure of the circuit is as follows: the source of the first P-type metal oxide transistor (hereinafter referred to as PMOS transistor) PM1 is connected to the power supply, the...

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Abstract

The invention relates to a low-noise low-dropout broadband ripple suppression linear voltage regulator. The voltage stabilizer comprises a linear voltage stabilizer main body circuit and a broadband ripple suppression circuit; the linear voltage regulator main body circuit comprises an error amplifier and a voltage feedback network, and is responsible for providing stable direct-current output voltage and suppressing low-frequency disturbance of the output voltage, and the broadband ripple suppression circuit monitors the change of the output voltage in real time, and dynamically compensates output current by superposing rapidly-changed control voltage on a grid electrode of a driving tube so as to suppress output ripples. Meanwhile, the ripple compensation circuit also greatly reduces theoutput noise of the medium-high frequency end.

Description

technical field [0001] The invention relates to a voltage stabilizer, in particular to a low-noise, low-dropout, wide-band ripple suppression linear voltage stabilizer, which belongs to the technical field of high-precision analog circuits. Background technique [0002] High-precision RF analog circuits require a stable and accurate power supply voltage to avoid the impact of power fluctuations on circuit performance. Compared with DC-DC converters, linear regulators (LDOs) can provide lower ripple and provide more timely feedback regulation to suppress power supply voltage fluctuations. Therefore, LDO is usually used in the last stage of power supply, directly supplying power to the on-chip circuit. With the improvement of integration, more and more circuit modules are integrated on the same substrate. In order to avoid mutual interference between circuits, it is necessary to set up a separate LDO power supply for each sensitive circuit. At the same time, in order to con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 陈超
Owner SOUTHEAST UNIV
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