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Low Output Voltage Fast Response LDO Circuit Based on Current Control Loop

A current and circuit technology, applied in the field of integrated circuit design, can solve problems such as limiting the output voltage range and being unable to produce a voltage output lower than 1V, and achieve the effects of reducing output ripple, rapid response, and precise control

Inactive Publication Date: 2011-12-28
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the reference voltage of the common LDO structure comes from the bandgap reference voltage source with 1.23V output. The bandgap reference voltage of 1.23V limits the range of the output voltage and cannot produce a voltage output lower than 1V.

Method used

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  • Low Output Voltage Fast Response LDO Circuit Based on Current Control Loop
  • Low Output Voltage Fast Response LDO Circuit Based on Current Control Loop
  • Low Output Voltage Fast Response LDO Circuit Based on Current Control Loop

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Embodiment Construction

[0028] The structure and working process of the low output voltage fast response LDO based on the current control loop disclosed in the present invention will be described in detail below with reference to the accompanying drawings.

[0029] The low output voltage fast response LDO based on the current control loop disclosed by the invention is composed of a voltage buffer, a transconductance amplifier, a loop filter and a power tube, and an off-chip load is provided outside the chip. As a voltage sampling module, the voltage buffer consists of an operational amplifier OP, a resistor R 0 and R 1 composition, the output voltage V out Connected to the non-inverting input of the operational amplifier OP, the output of the operational amplifier OP V S connected to resistor R 0 One end is also connected to the input tube M of the transconductance amplifier OTA 0 of the gate, the resistor R 0 The other end is connected to the inverting input of the operational amplifier OP and ...

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Abstract

The response ability to the transient change of the load is an important indicator of the LDO performance of the low dropout voltage regulator. The present invention learns from the loop control method of the charge pump type phase-locked loop, discloses a low output voltage fast response LDO structure based on the current control loop, the feedback voltage is converted into current, and the current signal is used as the carrier in the control loop. Operation, the difference current is integrated by the loop filter to form the control voltage of the power tube. Low-dropout regulators based on current control loops respond well to load transients and can produce voltage outputs lower than typical bandgap reference voltages. The fast-response LDO circuit based on the current control loop disclosed by the invention is composed of a voltage buffer, a transconductance amplifier, a loop filter, a power tube and an off-chip load.

Description

technical field [0001] The invention belongs to the field of integrated circuit design and is used for the design of a low-dropout regulator circuit (Low-dropout Regulator, LDO), in particular to a circuit structure for improving the transient response capability of the LDO by using a current control loop. Background technique [0002] Power integrated circuits are an indispensable part of electronic systems. As a kind of power supply integrated circuit, LDO is widely used because of its advantages of flexible use, little influence on power supply voltage, and small output ripple. figure 1 A is a typical LDO circuit structure, which uses a resistor network to sample and an operational amplifier (Operational Amplifier, OP) to amplify the error voltage. This is a typical second-order loop, figure 1 B is the transmission model of the loop. [0003] Although LDO has many advantages, there are still several problems that limit the use of LDO, the most prominent of which is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 马卓张民选谢伦国李少青赵振宇郭阳陈吉华王丽萍段志奎王志鹏吴了何小威孙岩乐大珩
Owner NAT UNIV OF DEFENSE TECH
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