Non-capacitive low-dropout linear voltage stabilizing system and bias current regulating circuit thereof

Abstract

The invention belongs to the field of integrated circuit design, and provides a non-capacitive low-dropout linear voltage stabilizing system and a bias current regulating circuit thereof. The non-capacitive low-dropout linear voltage stabilizing system comprises the bias current regulating circuit. The bias current regulating circuit comprises a static voltage signal generating module, a high-pass filtering module and a current regulating module. The non-capacitive low-dropout linear voltage stabilizing system and the bias current regulating circuit have the advantages that bias current of a non-capacitive low-dropout linear voltage stabilizer is adaptively regulated according to the change condition of current outputted by the non-capacitive low-dropout linear voltage stabilizer, so that purposes of dynamically regulating the bias current and reducing power consumption of the non-capacitive low-dropout linear voltage stabilizer are achieved simultaneously, an effect of increasing the transient response speed of the non-capacitive low-dropout linear voltage stabilizer is realized, and problems of excessively high power consumption and low transient response speed of an existing non-capacitive low-dropout linear voltage stabilizer are solved.

Description

Technical field [0001] The invention belongs to the field of integrated circuit design, and particularly relates to a non-capacitance low-dropout linear voltage stabilizing system and a bias current adjustment circuit thereof. Background technique [0002] Low-Dropout regulator (LDO), as an important power management module, is widely used in various handheld devices and portable electronic products. [0003] At present, low-dropout linear regulators are divided into capacitive and non-capacitor types. Among them, capacitive low-dropout linear regulators refer to traditional low-dropout linear regulators with large external capacitors. Compared with the capacitive LDO, the non-capacitor LDO is widely used because of its simple structure, low cost and easy integration. [0004] However, in a capacitorless LDO, the power consumption of the entire LDO circuit is too high because the circuit bias current cannot be adjusted quickly when its output current changes, and the transient respo...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a bias current adjustment circuit for a non-capacitor low-dropout linear voltage regulator system, which aims to solve the problem of excessive power consumption and transient response of the existing non-capacitor low-dropout linear voltage regulator. slow speed problem

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