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High-power supply noise restraint low-voltage difference voltage regulator

A voltage regulator, low dropout technology, used in control/regulation systems, regulating electrical variables, instruments, etc., can solve problems such as drop, achieve high power supply suppression capability, and improve power supply noise suppression capability.

Inactive Publication Date: 2008-09-24
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this new design for an electronic device's voltage regulators are improved resistance against electrical interference caused by radio waves or other signals from outside sources like microwaves during operation at very specific frequencies called up below 10 KHZ (10 kHz). This makes them more effective when used over wide range of frequencies such as those found within certain areas around us.

Problems solved by technology

This patented technical problem addressed by the patents relates to improving the effectiveness of reducing electrical current interference (EMI) caused by different types of sources such as batteries or other energy storage systems during operation when changing load conditions on an AC/DC adapter.

Method used

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  • High-power supply noise restraint low-voltage difference voltage regulator
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  • High-power supply noise restraint low-voltage difference voltage regulator

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Embodiment Construction

[0016] At present, many existing technologies adopt a three-stage amplifier structure to design a low-dropout voltage regulator, which has the advantages of large gain, high bandwidth, and high power supply noise suppression ability in a wide frequency range. Embodiments of the present invention improve upon this three-stage amplifier.

[0017] figure 1 is a circuit diagram of a low dropout voltage regulator according to a first embodiment of the present invention.

[0018] Such as figure 1 As shown, the entire low-dropout voltage regulator is composed of a first-stage transconductance operational amplifier, a second-stage common-source amplifier, a third-stage output circuit, a feedback network, and a supply voltage suppression enhancement circuit.

[0019] The first-stage transconductance operational amplifier consists of MPY4, MP4, MNY2, MN2, MNY3, MN3, MP1, and MPY1. Among them, MP1 and MPY1 form an input differential pair, MNY2 and MN2 form a current mirror, MNY3 and M...

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Abstract

The invention discloses a low dropout regulator which comprises a voltage input end and a voltage output end which is connected with a first grade operational amplifier, a second grade common-source amplifier and a third grade output circuit, wherein, the output end of the first grade operational amplifier is connected with the input end of the second grade amplifier; the output end of the second amplifier is connected with the input end of the third grade output circuit; the output end of the third grade output circuit is connected with the output end of modulating voltage, wherein, the regulator also comprises a feedback network which is connected between the output end of the modulating voltage and the inverting input end of the first grade operational amplifier; the non-inverting input end of the first grade operational amplifier receives reference voltage. The invention is characterized in that the regulator also comprises a feedback capacitor which is connected between the output end of the second common-source amplifier and the grid of a load current mirror at one side of the non-inverting input end of the first grade operational amplifier. Compared with the traditional voltage regulator, the regulator improves the suppression capability of the power supply noise of the voltage regulator at higher frequency band.

Description

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Claims

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Application Information

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Owner WUXI ZGMICRO ELECTRONICS CO LTD
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