Gain self-adaption error amplifier

An error amplifier and self-adaptive technology, applied in differential amplifiers, amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as poor performance of error amplifiers, reduce differential voltage output, reduce power supply output ripple, and reduce system The effect of power consumption

Active Publication Date: 2017-03-29
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the poor performance of existing error amplifiers, and a gain adaptive error amplifier is provided

Method used

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  • Gain self-adaption error amplifier

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and embodiment, describe technical solution of the present invention in detail:

[0023] A gain-adaptive error amplifier, such as figure 1 As shown, it includes a level shift circuit, an operational transconductance amplifier (OTA), a comparison circuit and a limiter circuit.

[0024] The level shifting circuit makes the input level of the operational transconductance amplifying circuit meet the normal working requirements. In a preferred embodiment of the present invention, the above-mentioned level shifting circuit includes bipolar transistors Q1-Q2, and resistors R1-R2. The bipolar transistors Q1-Q2 are PNP type bipolar transistors. The collectors of bipolar transistors Q1 and Q2 are grounded to GND. The emitters of bipolar transistors Q1 and Q2 are respectively connected to resistors R1 and R2. The base of the bipolar transistor Q1 is connected to the external reference voltage V ref1 , the base of the bipolar tran...

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Abstract

The invention discloses a gain self-adaption error amplifier comprising a level shift circuit, an operation transconductance amplification circuit and a comparison circuit. An input level of the operation transconductance amplification circuit meets a normal operation requirement by the level shift circuit; the operation transconductance amplification circuit uses a bipolar audion as a differential pair transistor, and utilizes an MOS tube common-source structure current mirror to provide current bias for the differential pair transistor to reduce power consumption, so as to ensure providing of greater gain; the comparison circuit utilizes a feedback structure to control a circuit output slew rate, so as to output a control signal of the operation transconductance amplification circuit; an amplitude limiting circuit limits the output voltage of the operation transconductance amplification circuit. According to the amplifier provided by the invention, power output ripples in a load current stabilization application are reduced, and thus power consumption of a system is reduced, and meanwhile influence on a load transient behavior is small.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, in particular to a gain adaptive error amplifier. Background technique [0002] The error amplifier is an indispensable module in analog integrated circuits and hybrid integrated circuits. It is commonly used in circuit systems such as power amplifiers and DC-DC converters. It is used to compare the difference between an input voltage and a reference external reference voltage and convert the difference The value is amplified to provide a difference voltage for other circuit modules, and its characteristics affect the performance of the entire system to a large extent. [0003] For the DC-DC power management system in PWM control mode, the output ripple characteristic is a very important topic in system design. As a power supply, in order to avoid damage to the load, the output ripple should be as small as possible. The output ripple of the PWM DC-DC power management system is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30H03F3/45
CPCH03F1/306H03F3/45394
Inventor 韦雪明赵洪飞徐卫林岳宏卫韦保林段吉海
Owner GUILIN UNIV OF ELECTRONIC TECH
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