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voltage regulator

A voltage regulator and voltage adjustment technology, applied in the direction of instruments, adjusting electrical variables, control/regulating systems, etc., can solve the problems of power-off output voltage drop, output load circuit can not work normally, etc., to avoid the effect of current backflow

Active Publication Date: 2022-03-08
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a voltage regulator, which can solve the problems in the related art that the output voltage drops rapidly when the power is turned off, and the output load circuit cannot work normally.

Method used

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Embodiment Construction

[0033] The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or i...

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Abstract

The present invention relates to the technical field of semiconductor integrated circuits, in particular to a voltage regulator. It includes: a differential amplifier circuit, a feedback circuit and a voltage adjustment output circuit; the voltage adjustment output circuit includes a first PMOS tube, a second PMOS tube, a first NMOS tube, a second NMOS tube, a third NMOS tube and a capacitor; the feedback circuit the output end of the voltage regulator is connected; the differential amplifier circuit includes a first differential branch and a second differential branch that are symmetrically connected; the first differential branch includes a first cascade amplifier and a first active load connected to each other , the second differential branch includes a connected second cascade amplifier and a second active load; the input end of the first cascade amplifier is connected to the reference voltage, and the input end of the second cascade amplifier is connected to the feedback end of the feedback circuit; The node connecting the second cascade amplifier and the second active load serves as the output end of the differential amplifier circuit. The present invention can avoid the problem of current backflow, and ensure that the voltage adjustment circuit can still output stably.

Description

technical field [0001] The invention relates to the technical field of semiconductor integrated circuits, in particular to a voltage regulator. Background technique [0002] Voltage regulators are widely used in integrated circuits, such as figure 1 Shown is a circuit schematic diagram of a voltage regulator in the related art; the voltage regulator in the related art includes an amplification circuit, an adjustment circuit and a feedback circuit. [0003] Wherein, the amplifying circuit includes an amplifier body composed of NMOS transistors MN1, MN2, MN3 and MN4, and the amplifier body is a cascode differential amplifier structure, and the PMOS transistors MP1, MP2, MP3 and MP4 form an active load, and the NMOS transistors MP1, MP2, MP3 and MP4 form an active load. The tube MN5 forms a tail current source; the bias voltage terminal VB1 is connected to the gate of the NMOS tube MN5, the bias voltage terminal VB2 is connected to the gates of the NMOS tubes MN2 and MN4, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 邵博闻
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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