Noise high power supply rejection ratio circuit

A high-noise, power-supply technology, applied in the electronic field, can solve problems such as zero-point and pole-point cancellation ineffectiveness, change of loop bandwidth, and poor stability, and achieve high PSRR, increased loop gain, and good bandwidth.

Pending Publication Date: 2021-10-29
宁波市芯能微电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the prior art, the suppression ratio circuit introduces a zero point through the series resistance of an external capacitor to offset a pole to achieve loop stability. Since the main pole value is proportional to the load resist

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  • Noise high power supply rejection ratio circuit

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Embodiment 1

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0029] figure 1 and figure 2 For the suppression ratio circuit in the prior art, the loop is stabilized by introducing a zero point through the series resistance of an external capacitor to offset a pole point. But it has the following disadvantages: First, since the main pole value is proportional to the load resistance, the change of the outp...

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Abstract

The invention relates to the technical field of electronics, in particular to a noise high power supply rejection ratio circuit. The noise high power supply rejection ratio circuit comprises: a first-stage amplification circuit consisting of an operational amplifier and a capacitor C1; a second-stage amplifying circuit consisting of MOS (Metal Oxide Semiconductor) transistors M2, M3, M4, M5, M6, M7, M8 and MPS, a resistor RC and capacitors C and CC; and a third-pole amplifying circuit consisting of MOS (Metal Oxide Semiconductor) tubes M1 and MP, capacitors Cpar, CO and Cb and resistors Resr and RL. The output end of the operational amplifier in the first-stage amplifying circuit is connected to the grid electrode of the MOS tube M6 in the second-stage amplifying circuit, the grid electrode of the MOS tube MPS in the second-stage amplifying circuit is connected with the grid electrode of the MOS tube MP in the third-stage amplifying circuit, and the grid electrode of the MOS tube M2 in the second-stage amplifying circuit is connected with the grid electrode of the MOS tube M1 in the third-stage amplifying circuit. On the basis, a relatively high PSRR and a relatively good bandwidth are realized.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a circuit with high noise and high power rejection ratio. Background technique [0002] With the continuous development of electronic products, power management solutions continue to pursue high efficiency, small area, and low cost. The LDO (Low Drop out) linear regulator has been widely used in various mobile electronic systems, such as notebook computers, cellular Telephones, pagers, PDAs, etc. It can greatly reduce the saturation voltage of the output transistor, so that the input voltage can be very close to the output voltage, thereby reducing power consumption and extending battery life. However, in the prior art, the suppression ratio circuit introduces a zero point through the series resistance of an external capacitor to offset a pole to achieve loop stability. Since the main pole value is proportional to the load resistance, the change of the output current will c...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 林浩张廉冉成新王宝峰张力夏银水王志红林丰成
Owner 宁波市芯能微电子科技有限公司
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