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Compensation module and voltage regulator

A voltage regulator and compensation module technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as increasing manufacturing costs, reducing the power supply rejection ratio of the voltage regulator 30, increasing the layout area of ​​the voltage regulator 30, etc.

Inactive Publication Date: 2016-12-28
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adopting the dominant pole compensation method will greatly increase the layout area of ​​the voltage regulator 30, thereby increasing the manufacturing cost.
In addition, the high-frequency power supply noise in the voltage regulator 30 will still pass through the parasitic capacitance C of the P-type transistor MP1 SD is directly passed to the output terminal OUT, causing the power supply rejection ratio of the voltage regulator 30 to drop

Method used

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  • Compensation module and voltage regulator
  • Compensation module and voltage regulator
  • Compensation module and voltage regulator

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Embodiment Construction

[0051] Please refer to Figure 4 , Figure 4 It is a schematic diagram of a voltage regulator 40 according to an embodiment of the present invention. The voltage regulator 40 is used to generate a stable output voltage VOUT at the output terminal OUT according to the input voltage VIN at the input terminal IN. Such as Figure 4As shown, the voltage regulator 40 includes a gain stage 400 , a compensation module 402 , an output stage 404 and a Miller compensation module 406 . The gain stage 400 is used to output a voltage VOTA at an output terminal OUTOTA according to an input voltage VIN at an input terminal IN. The compensation module 402 is coupled to the gain stage 400 and includes a low output impedance non-inverting gain unit 408 . The compensation module 402 is used for outputting a voltage VG at a node G according to the voltage VOTA. The output stage 404 is coupled to the gain stage 400 and the compensation module 402 for generating an output voltage VOUT at the ou...

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Abstract

The invention discloses a compensation module used in a voltage regulator. The voltage regulator includes a gain stage, an output stage and a Miller compensation module. The compensation module includes a low output impedance non-inverting gain unit, It is coupled between an amplified output end of the gain stage and an output stage input end of the output stage.

Description

technical field [0001] The invention relates to a compensation module and a voltage regulator thereof, in particular to a compensation module and a voltage regulator capable of improving stability and anti-noise capability. Background technique [0002] In integrated circuits, a voltage regulator (Voltage Regulator) is a negative feedback circuit commonly used to generate accurate and stable voltages. The voltage output by the voltage regulator is usually used as a reference voltage or power supply for other circuits in the integrated circuit. Therefore, in the design of the voltage regulator, it is often necessary to use frequency compensation to improve the stability of the voltage regulator, and use the negative feedback characteristics of the voltage regulator itself to reduce the power supply noise interference of the system power supply and improve the power supply rejection ratio of the voltage regulator ( Power Supply Rejection Ratio, PSRR). [0003] Please refer t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 胡敏弘苏品翰黄俊为吴振聪黄秋皇
Owner NOVATEK MICROELECTRONICS CORP