A Fully Integrated Load Pole Compensated Linear Regulator

A linear voltage regulator, a fully integrated technology, applied in the direction of instruments, control/regulation systems, and regulation of electrical variables, etc., can solve the problems of constructing dominant poles, pole position changes, feedback loop stability issues, etc., and achieve high ripple Suppression effect, effect of suppressing output voltage ripple

Active Publication Date: 2022-01-28
SOUTHEAST UNIV
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  • Abstract
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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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  • A Fully Integrated Load Pole Compensated Linear Regulator
  • A Fully Integrated Load Pole Compensated Linear 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 stabilizer, which includes two parts: a main circuit of the linear voltage stabilizer and a load pole compensation circuit. The main circuit of the linear regulator is responsible for providing a stable DC output voltage and suppressing low-frequency disturbances of the output voltage. The load pole compensation circuit monitors the high-frequency disturbance of the output voltage, and stabilizes the output voltage by quickly injecting compensation current, which is equivalent to introducing a low impedance at the load end to reduce the RC constant at this point, ensuring that the output end is still constant under light load conditions. The second pole and away from the unity-gain bandwidth guarantees the phase margin of the 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 Patents(China)
IPC IPC(8): G05F1/565
CPCG05F1/565
Inventor 陈超
Owner SOUTHEAST UNIV
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