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High-power-supply-rejection-ratio low dropout regulator

A low-dropout linear voltage regulator technology, applied in the direction of instruments, electrical variable adjustment, control/regulation systems, etc., can solve the problems of poor PSRR index and restricting the stability of low-dropout linear voltage regulators, etc.

Inactive Publication Date: 2018-06-29
BEIJING TONGFANG MICROELECTRONICS
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  • Abstract
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AI Technical Summary

Problems solved by technology

The PSRR of the low dropout linear regulator is about 50dB at 10KHZ, and the PSRR value is as low as 34dB at 100KHZ, but the disadvantage of the low dropout linear regulator is that the PSRR index in the range of 100KHZ is poor , which restricts the stability of the LDO output

Method used

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Embodiment Construction

[0023] see Figure 5 , is a structural diagram of a low-dropout linear voltage regulator with a high power supply rejection ratio implemented in the present invention. The low dropout linear regulator has a feedforward noise path, and the low dropout linear regulator includes a filter capacitor Cf, a filter resistor Rf, a feedforward amplifier AFF, an error amplifier AFB, a pass tube Mp, a feedback resistor R1, and a feedback resistor R2 and the load capacitor CL, wherein the filter capacitor Cf and the filter resistor Rf form a high-pass filter, the feed-forward amplifier AFF and the error amplifier AFB form an amplifier circuit, the high-pass filter is connected to the feed-forward amplifier AFF, and the feed-forward amplifier AFF and the error amplifier AFB Connect through compensation capacitor Cc. Both the feed-forward amplifier AFF and the error amplifier AFB adopt a high-gain folded cascode structure.

[0024] Such as Figure 6 Shown is the structure diagram of the a...

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Abstract

The invention provides a high-power-supply-rejection-ratio low dropout regulator. The high power supply rejection ratio low dropout regulator comprises a filter capacitor, a filter resistor, a feedforward amplifier, an error amplifier, a breakover tube, a feedback resistor and a load capacitor and is characterized in that the filter capacitor and the filter resistor form a high-pass filter and areconnected to the feedforward amplifier, and the feedforward amplifier and the error amplifier are connected through a compensation capacitor; when the frequency is below 1 KHZ, the feedforward amplifier is disconnected from a low dropout regulator loop, and when the frequency exceeds 1 KHZ, the feedforward amplifier connects the low dropout regulator loop. In the high-power-supply-rejection-ratiolow dropout regulator, feedforward noise formed by the high-pass filter and the feedforward amplifier offsets channels to establish a new noise channel, the introduced new noise channel can effectively offset a noise channel brought by the low dropout regulator loop and a noise channel introduced by a resistor between an MOS breakover tube source and drain, and thus the performance of the PSRR can increase about 10 dB within the range of 100 KHZ.

Description

technical field [0001] The invention relates to the technical field of integrated circuit power management chips, in particular to a low-dropout linear voltage regulator with high power supply rejection ratio. Background technique [0002] Nowadays, smart home devices have been involved in all aspects of our lives. Power management chips with good performance will greatly promote the improvement of the performance of smart devices. In addition, portable electronic products have increasingly become an indispensable part of people's daily life. Mobile phones and tablet computers are inseparable from power management chips. The power management chip is responsible for the transformation, distribution, detection and other functions of electric energy in electronic equipment. Low Dropout Linear Regulator (Low Dropout Linear Regulator, Low Dropout Linear Regulator) is a crucial device for power management chips. The Low Dropout Linear Regulator can provide the system with a stabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 胡晓辉霍俊杰豆玉娇安建宏
Owner BEIJING TONGFANG MICROELECTRONICS
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