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Capacitance multiplication circuit and linear voltage regulator

A linear regulator and capacitance multiplying technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as undershoot and LDO output overshoot, and achieve cost reduction, small chip area occupation, and easy integration. Effect

Active Publication Date: 2020-10-02
SHANGHAI AWINIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the application provides a capacitance multiplication circuit and a linear voltage regulator to solve the problem of LDO output overshoot and undershoot

Method used

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  • Capacitance multiplication circuit and linear voltage regulator
  • Capacitance multiplication circuit and linear voltage regulator
  • Capacitance multiplication circuit and linear voltage regulator

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Embodiment Construction

[0022] As mentioned in the background art, the structure of the capacitor multiplication circuit in the prior art is relatively complicated and difficult to integrate.

[0023] The capacitance multiplication circuit structure commonly used in the prior art includes a voltage mode capacitance multiplication circuit and a current mode capacitance multiplication circuit. The voltage mode capacitance multiplication circuit has an open-loop operational amplifier. Although the gain is high, the linearity is poor, and the actual gain is greatly affected by the fluctuation of the process and temperature, so that the equivalent capacitance after multiplication often fluctuates greatly. Application For LDO, the stability is poor, and the structure is more complicated; and the existing current-mode capacitance multiplication circuit, although compared with the voltage-mode capacitance multiplication circuit, has a relatively simple structure, but it cannot solve the problem of the output ...

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Abstract

The invention discloses a capacitance multiplication circuit and a linear voltage regulator. The capacitance multiplication circuit comprises an equivalent capacitance module, wherein the equivalent module comprises an on-chip capacitor, the equivalent capacitance module is used for providing equivalent capacitance for a voltage stabilization node, and the capacitance value of the equivalent capacitance is multiple times of the capacitance value of the on-chip capacitor; and a negative feedback module connected to the equivalent capacitance module and the voltage stabilization node and used for feeding back compensation current to the voltage stabilization node when the voltage of the voltage stabilization node overshoots or undershoots, wherein the compensation current and transient current generated at the voltage stabilization node are the same in magnitude and opposite in direction. The capacitance multiplication circuit is simple in structure and easy to integrate.

Description

technical field [0001] The application relates to the technical field of integrated circuits, in particular to a capacitance multiplication circuit and a linear voltage regulator. Background technique [0002] Linear regulators (LDO, Low Dropout Regulator) are widely used in many fields, and have the advantages of small output ripple. At present, linear regulators can be divided into Capfree type LDO and Capless type LDO. Capfree type LDO needs to be stabilized by adding an off-chip large capacitor, and the typical capacitance level is at the uF level. The Capless LDO does not require an external capacitor and is integrated. However, considering the transient peak impact caused by the overshoot or undershoot of the output voltage, a voltage stabilizing capacitor is generally built in the chip. The typical built-in capacitor level is several Ten picofarads (pF) to hundreds of picofarads (pF), even nanofarads (nF). However, due to the larger capacitor area and the built-in l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 王伟何永强
Owner SHANGHAI AWINIC TECH CO LTD
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