Low-dropout linear voltage stabilization circuit

Abstract

The invention provides a low-dropout linear voltage stabilization circuit. The low-dropout linear voltage stabilization circuit comprises a power supply noise suppression module, an error amplification module, a source follower, a regulating tube and a first capacitor, wherein the power supply noise suppression module is introduced with a power supply noise signal; the error amplification module is used for amplifying an error signal of the output voltage and reference voltage of the low-dropout linear voltage stabilization circuit; the source follower is used for outputting an output signal of the error amplification module and the power supply noise signal to a control end of the regulating tube; the regulating tube is used for regulating the output voltage under the control of the output signal of the source follower, and counteracting the power supply noise signal; and the first capacitor is connected to the output end of the low-dropout linear voltage stabilization circuit. According to the low-dropout linear voltage stabilization circuit, the noise of a medium frequency power supply is loaded to the gate of the regulating tube to counteract the influence of the noise of the medium frequency power supply on the output signal, and the noise suppression abilities of low frequency and high frequency power supplies are amplified in conjunction with the gain and the output capacitance of the circuit, thereby realizing the high power supply noise suppression ability of a full frequency band of a low-dropout differential linear voltage regulator without out-chip capacitance,lowering the influence of the power supply noise on a transmission signal, and greatly improving the quality of output signal.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a low-dropout linear regulator circuit. Background technique [0002] High-speed optical communication chips and radio frequency chips often require multiple power conversion circuits to provide stable internal power for the circuit to work, and at the same time isolate the noise-generating circuit from the noise-sensitive circuit on the power path, so as to improve the internal transmission of the chip. The quality of the signal. Generally, low-dropout linear regulators are used to realize the power conversion function inside the chip. In addition, in order to reduce the complexity of system design and reduce costs, low-dropout linear regulators without external compensation capacitors are often used. [0003] Traditional low-dropout linear regulators without off-chip capacitors often have high low-frequency and high-frequency power supply noise suppression capabilities...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a low-dropout linear voltage regulator circuit, which is used to solve the low-frequency power supply noise suppression ability of the low-dropout linear voltage regulator without off-chip capacitors in the prior art. bad question

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