Low-dropout linear voltage regulator with high power supply rejection ratio

Abstract

The invention discloses a low-dropout linear voltage regulator with the high power supply rejection ratio. The two input ends of an error amplifier are reference voltage and feedback voltage. The output end of the error amplifier is connected with an output pipe. The drain end of the output pipe is a series load resistor used for providing the feedback voltage. The source end of the output pipe is in cascade connection with an NMOS transistor and a Vt bias tracking circuit. The Vt bias tracking circuit comprises a series resistor and a triode connected with the series resistor. The NMOS transistor is connected between the source end of the output pipe and the input end of supply voltage. The input end of the NMOS pipe is connected with the triode of the Vt bias tracking circuit. The low-dropout linear voltage regulator has the advantages of being good in compatibility, low in cost, small in area, high in efficiency, low in noise, good in stability, high in power supply rejection ratio and suitable for working under no load or full load.

Description

technical field [0001] The invention belongs to the field of integrated circuit design and relates to a low-dropout linear voltage stabilizer, in particular to a low-dropout linear voltage stabilizer with a high power supply rejection ratio. Background technique [0002] Low dropout linear regulator (Low Dropout Liner Regulator) is widely used as the main power management unit of the system chip, from the central processing unit, memory to digital-to-analog, analog-to-digital converter, to DSP, baseband chip, the normal A stable power supply is required for operation. The main components of the traditional linear regulator are as follows: figure 1 As shown, it includes: 1) output power tube, which conducts the line between the input power supply voltage terminal and the output voltage terminal and forms a constant output voltage; 2) feedback network, used to monitor the output voltage; 3) voltage reference, which generates a Has nothing to do with the power supply voltage,...

AI Technical Summary

Problems solved by technology

[0004] Due to the increasing market demand for this high-performance low-dropout linear regulator, in recent years many studies have adopted a variety of methods to improve the performance of this regulator, and proposed many structures and methods, but the real full-chip However, there are few chips that are integrated inside and can meet the high power supply rejection ratio required in RF transceivers at the same time.

Images