A Low-Power Linear Transconductance Error Amplifier

An error amplifier, low-power technology, applied in the field of microelectronics, can solve the problems of large changes in quiescent current Iq in the range of changes, inability to achieve low power consumption, etc., to achieve low power consumption, reduce power consumption, and reduce quiescent current. Effect

Active Publication Date: 2018-01-23
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional error amplifier circuits such as figure 1 As shown, it is a simple two-stage operational amplifier using Miller compensation. For an operational amplifier whose output voltage is used as a power supply, the quiescent current Iq changes greatly under different power supply voltages due to the large variation range of the power supply. And because it works in the saturation region, it cannot achieve low power consumption

Method used

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  • A Low-Power Linear Transconductance Error Amplifier
  • A Low-Power Linear Transconductance Error Amplifier
  • A Low-Power Linear Transconductance Error Amplifier

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Embodiment Construction

[0025] Specific embodiments of the present invention will be described in detail below.

[0026] To achieve low power consumption, make the load of the op amp externally biased by V Bias , In addition, in order to realize the load of the current mirror, an operational amplifier OPA is used to embed the gate-drain stage of the NMOS transistor Mn1, which avoids the mirror pole and has certain benefits for stability; Feedback can further reduce the quiescent current Iq.

[0027] image 3 It is the specific circuit diagram of the clamped OPA operational amplifier, which is an important part of realizing circuit bias. The principle of bias is as follows:

[0028] figure 2 The tail current Id3 in can be expressed as:

[0029] I d3 =I 1 +I 2 +I 3 (1)

[0030] Due to the effect of the current mirror image of Mp4 and Mp3, the current flowing through Mp4 is:

[0031]

[0032] The current of Id4 is a function of Vgs5 and Vgs8, which can be expressed as:

[0033] I d4 =f(...

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Abstract

The invention relates to a low-power linear transconductance error amplifier. The low-power linear transconductance error amplifier comprises a bias circuit module and a two-stage main operational amplifier module employing local source-level negative feedback; the bias circuit module comprises a clamped operational amplifier (OPA), a PMOS tube Mp4, a PMOS tube Mp8 and an NMOS tube Mn5; the two-stage main operational amplifier module employing local source-level negative feedback comprises a PMOS tube Mp1, a PMOS tube Mp2, a PMOS tube Mp3, a PMOS tube Mp5, a PMOS tube Mp6, a PMOS tube Mp9, an NMOS tube Mn1, an NMOS tube Mn2, an NMOS tube Mn3, an NMOS tube Mn4, a resistor R1, a resistor R2, a resistor RS and a miller capacitor C1. The low-power linear transconductance error amplifier has the following beneficial effects that linear transconductance is realized by use of the local source-level negative feedback technology, the static current of the whole linear transconductance error amplifier working within a sub-threshold region can be reduced and low-power working of the amplifier can be realized.

Description

technical field [0001] The invention belongs to the technical field of microelectronics, and in particular relates to a low power consumption linear transconductance error amplifier. Background technique [0002] The error amplifier in the DC / DC converter is an important part of the voltage loop, and its main function is to complete the compensation of the entire voltage loop. For a low-power DC-DC converter, the low power consumption of the error amplifier is realized It also appears to be particularly important. [0003] Conventional error amplifier circuits such as figure 1 As shown, it is a simple two-stage operational amplifier using Miller compensation. For an operational amplifier whose output voltage is used as a power supply, the quiescent current Iq changes greatly under different power supply voltages due to the large variation range of the power supply. And because it works in the saturation region, it cannot achieve low power consumption. Contents of the inv...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H03F1/34H03F3/45
Inventor刘帘曦罗勇周逸阳朱樟明杨银堂
OwnerXIDIAN UNIV