A System for Reducing Crosstalk in Linear Regulators

Abstract

The invention relates to the technical field of electronic communication, in particular to a power management system. A system for reducing the crosstalk of a linear voltage regulator, which is applied to a system powered by the same power supply chip, includes a first linear voltage regulator, which supplies power to a setting function module under the action of a first control signal, and is used in the setting Under certain conditions, the working state is adjusted under the action of a driving signal; a second linear voltage regulator is used to supply power to the set function module under the action of a second control signal, and at the same time generate a driving signal; the control unit is used to generate the first A control signal and a second control signal, the second control signal is delayed by a set time compared with the first control signal. The present invention generates a drive signal through the second linear voltage regulator, so that when the second linear voltage regulator is turned on, the bias current of the entire circuit of the first linear voltage regulator is doubled under the action of the driving signal, thereby increasing the operational amplification unit Gain, improve power supply rejection ratio, reduce crosstalk between linear regulators.

Description

technical field [0001] The invention relates to the technical field of electronic communication, in particular to a power management system. Background technique [0002] Portable devices are usually equipped with multiple low-dropout linear regulators to meet the power requirements of multiple functional units such as audio, lighting, communication, etc., and a power chip is connected to multiple low-dropout linear regulators to realize portable devices. power management, however in prior art, such as figure 1 and figure 2 As shown, when a low dropout linear voltage regulator connected to the same power chip is turned on, it will interfere with the working low dropout linear voltage regulator and affect the normal operation of the system. Contents of the invention [0003] The object of the present invention is to provide a system for reducing the crosstalk of a linear voltage regulator to solve the above technical problems; [0004] The technical problem solved by th...

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Problems solved by technology

[0002] Portable devices are usually equipped with multiple low-dropout linear regulators to meet the power requirements of multiple functional units such as audio, lighting, communication, etc., and a power chip is connected to multiple low-dropout linear regulators to realize portable devices. power management, however in prior art, such as figure 1 and figure 2 As shown, when a low-dropout linear regulator connected to the same power chip is turned on, it will interfere with the working low-dropout linear regulator and affect the normal operation of the system.

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