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Fully-integrated load pole compensation linear voltage regulator

A linear voltage regulator, a fully integrated technology, applied in the direction of instruments, adjusting electrical variables, control/regulation systems, etc., can solve the problems of pole position change, constructing dominant poles, feedback loop stability issues, etc., to suppress the output voltage Effect of ripple, high ripple suppression effect

Active Publication Date: 2020-06-02
SOUTHEAST UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The fully integrated LDO only has a limited filter capacitor, and the ripple suppression needs to be reacted and compensated by the circuit itself, which puts forward higher requirements for the bandwidth of the feedback loop.
In addition, since it is impossible to use off-chip large capacitors to construct the main pole at the load end, a large change in the load current will cause a significant change in the pole position and cause stability problems in the feedback loop

Method used

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  • Fully-integrated load pole compensation linear voltage regulator
  • Fully-integrated load pole compensation linear voltage regulator

Examples

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Embodiment 1

[0010] Embodiment 1: see figure 1 , figure 2 , a fully integrated load pole compensation linear regulator, the linear regulator includes a linear regulator main circuit and a load pole compensation circuit, the main circuit of the linear regulator includes an error amplifier and a voltage feedback network, responsible for Provide a stable DC output voltage and suppress the low-frequency disturbance of the output voltage; the main body of the load pole compensation circuit is an adaptively biased common-gate amplifier, which stabilizes the output voltage by monitoring the high-frequency disturbance of the output voltage and quickly injecting compensation current. It is also equivalent to introducing low impedance at the load end to reduce the RC constant at this point, ensuring that the output end is still a sub-pole and away from the unity gain bandwidth under light load conditions, and ensuring the phase margin of the feedback loop.

[0011] figure 1 Shown is the circuit s...

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Abstract

The invention relates to a fully-integrated load pole compensation linear voltage regulator. The fully-integrated load pole compensation linear voltage regulator comprises a linear voltage regulator main body circuit and a load pole compensation circuit, wherein the linear voltage stabilizer main body circuit is responsible for providing a stable DC output voltage and suppressing low-frequency disturbance of the output voltage, and the load pole compensation circuit monitors the high-frequency disturbance of the output voltage. The fully-integrated load pole compensation linear voltage regulator stabilizes the output voltage in a mode of quickly injecting compensation current, equivalently introduces low impedance at the load end to reduce the RC constant of the point, ensures that the output end is still a secondary pole and is far away from the unit gain bandwidth under the condition of light load, and ensures the phase margin of a feedback loop.

Description

technical field [0001] The invention relates to a voltage stabilizer, in particular to a fully integrated load pole compensation 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 under instantaneous load changes. 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 radio frequency modules are integrated in the same chip. In order to avoid mutual interference among various circuit modules, it is necessary to set a separate LDO power supply for each sensitive module. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/565
CPCG05F1/565
Inventor 陈超
Owner SOUTHEAST UNIV
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