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Linear voltage regulator

A technology of linear regulators and amplifiers, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as slow DC operating point settling time, and achieve the effect of improving startup speed

Active Publication Date: 2015-12-16
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] Although the existing linear regulator can achieve stable voltage output, there will be a problem of slow DC operating point settling time when it is powered on

Method used

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Embodiment Construction

[0038] The linear voltage regulator according to the embodiment of the present invention includes: an error amplifier, a voltage adjustment device and a feedback network.

[0039] The error amplifier includes an amplifier body, a first tail current source and an active load.

[0040] The amplifier body has a differential structure, the source terminals of the two differential circuits of the amplifier body are connected to the first tail current source, and the active load includes a first differential active load and a second differential active load which are mirror images of each other. Active loads, the first differential active load and the second differential active load are respectively connected to the load terminals of the two differential circuits of the amplifier body.

[0041] The error amplifier also includes an accelerated start-up circuit for accelerating the start-up of the linear voltage regulator, the first part of the accelerated start-up circuit is a mirror...

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Abstract

The invention discloses a linear voltage regulator comprising an error amplifier, a voltage adjusting component and a feedback network. The error amplifier is formed by an amplifier body, a first tail current source and an active load, wherein the amplifier body is in a differential structure; a source end is connected with the first tail current source; a load end is connected with a first differential active load and a second active load; the first and second active loads are mirror images to each other; the error amplifier further comprises an accelerating start circuit; a first part circuit of the accelerating start circuit is a mirror image circuit of the first differential active load; a second part circuit of the accelerating start circuit is connected with the first part circuit; a third part circuit of the accelerating start circuit is a mirror image circuit of the second part circuit; and the third part circuit provides a source end for the second tail current to the two differential circuits of the amplifier body. By the use of the linear voltage regulator, starting speed can be improved.

Description

technical field [0001] The invention relates to a semiconductor integrated circuit, in particular to a linear regulator. Background technique [0002] Linear regulators are widely used in integrated circuits, such as figure 1 Shown is the circuit diagram of the existing linear voltage regulator; the existing linear voltage regulator includes an error amplifier, a voltage adjustment device and a feedback network. [0003] The error amplifier includes an amplifier body composed of NMOS transistors MN1, MN2, MN3 and MN4, and the amplifier body is a cascode differential amplifier structure, PMOS transistors MP1, MP2, MP3 and MP4 form an active load, and NMOS transistor MN5 forms a tail Current source; the bias voltage VB3 is connected to the gate of the NMOS transistor MN5, the bias voltage VB1 is connected to the gates of the NMOS transistors MN2 and MN4, and the bias voltage VB2 is connected to the gates of the PMOS transistors MP2 and MP4. [0004] The voltage adjustment de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 邵博闻周宁唐成伟
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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