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High-bandwidth high-PSRR low-pressure-drop linear voltage regulator

A linear voltage regulator, low-dropout technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as large noise spectrum, high bandwidth, and increase LDO leakage voltage, achieving simple system architecture and PM parameters. Improve and enhance the effect of system stability

Inactive Publication Date: 2014-09-17
WUJIANG SHENGBORUI INFORMATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A low-dropout linear regulator (LDO) is a key module of a power management chip in a portable communication system, and its voltage is usually derived from a switching DC-DC converter, which eliminates the output ripple of the switching DC-DC converter and provides a Stable voltage, but with the advancement of technology, the noise spectrum of switching DC-DC converters is getting larger and larger, requiring LDOs with high bandwidth and high PSRR
[0003] LDO design with high power supply rejection ratio (PSRR) has always been a hot spot in power management research. In order to improve PSRR, researchers have provided many solutions. First, an RC filter can be provided on the LDO power supply to filter the power supply of the LDO itself, thereby Improve PSRR, so this method adds a resistor, which will increase the dropout voltage of the LDO

Method used

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Embodiment Construction

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0023] refer to figure 1 As shown, the Vin terminal is the voltage input terminal of the linear regulator LDO of this embodiment, the Vout terminal is the voltage output terminal, the Vref terminal is the reference voltage terminal, and IL is the load current. The specific structure of the linear regulator LDO in this embodiment includes:

[0024] The operational amplifier FA has a positive-phase terminal (+), an inverting terminal (-) and an output terminal, its positive-phase terminal (+) is connected to the voltage output terminal Vout, and its inverting terminal (-) is connected to the voltage output terminal Vout through a resistor RF1. The voltage input terminal Vin is connected with a resistor RF2 between its inverting terminal (-) and the output terminal, wherein the resistor RF1, the resistor RF2 and the operational amplifi...

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Abstract

The invention discloses a high-bandwidth high-PSRR low-pressure-drop linear voltage regulator. The linear voltage regulator comprises a voltage input end Vin, a reference voltage end Vref, an error amplifier EA and a power tube MP. The linear voltage regulator further comprises a feedforward circuit and an adder circuit. The feed forward circuit is connected between the voltage input end Vin and the grid electrode G of the power tube MP through the adder circuit, and the power tube MP is a PMOS power tube MP. The positive phase end of the error amplifier EA is connected with a feedback resistor. The feedback resistor is connected with a zero generation capacitor CZ in parallel. Due to the high-bandwidth high-PSRR low-pressure-drop linear voltage regulator, the voltage of the grid electrode G and the voltage of the source electrode S of the PMOS power tube MP keep unchanged, and PSRR performance is improved; besides, a second pole in the system can be eliminated by a zero generated by regulating a zero generation capacitor CZ, and therefore the stability of the system is improved.

Description

technical field [0001] The invention relates to a module of a power management chip in a portable communication system, in particular to a high-bandwidth, high-PSRR, low-drop linear voltage regulator. Background technique [0002] A low-dropout linear regulator (LDO) is a key module of a power management chip in a portable communication system, and its voltage is usually derived from a switching DC-DC converter, which eliminates the output ripple of the switching DC-DC converter and provides a Stable voltage, but with the advancement of technology, the noise spectrum of switching DC-DC converters is getting larger and larger, requiring LDOs with high bandwidth and high PSRR. [0003] LDO design with high power supply rejection ratio (PSRR) has always been a hot spot in power management research. In order to improve PSRR, researchers have provided many solutions. First, an RC filter can be provided on the LDO power supply to filter the power supply of the LDO itself, thereby ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 刘寅钟波万达经
Owner WUJIANG SHENGBORUI INFORMATION TECH
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