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Operational transconductance amplifier

A technology of transconductance amplifier and main amplifier, applied in the field of electronics, can solve the problems of low phase margin and linearity, poor slew rate improvement ability of operational transconductance amplifier, etc. Poor slew rate boosting ability and the effect of improving linearity

Active Publication Date: 2021-01-05
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of this application is to provide an operational transconductance amplifier, which is used to solve the technical problems of existing operational transconductance amplifiers with poor slew rate improvement capability and low phase margin and linearity

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Embodiment Construction

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

[0034] In the description of this application, 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 application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a spec...

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Abstract

According to the operational transconductance amplifier, an input differential branch current in a main amplifier is sampled through two MOS tubes of a maximum current selection circuit, and comparedwith an existing self-adaptive bias OTA, the operational transconductance amplifier has the advantages that the number of current sampling tubes connected in parallel at an input-stage active load issmaller, so that parasitic capacitance of internal nodes is reduced, the phase margin is improved, the maximum value of input differential branch current is selected to be input into the current comparison circuit for current comparison processing, and the current comparison circuit outputs logic control level to control connection and disconnection of the slew rate enhancing device to be used forimproving the slew rate, so that the slew rate enhancing device is not turned on under static and small signal conditions. The linearity is improved; and when a large signal is input in a step mode,a better slew rate is obtained under the same static power consumption. The operational transconductance amplifier solves the technical problems that an existing operational transconductance amplifieris poor in slew rate improving capacity and low in phase margin and linearity.

Description

technical field [0001] The present application relates to the field of electronic technology, in particular to an operational transconductance amplifier. Background technique [0002] Operational transconductance amplifier (OTA) is the most basic and important module unit circuit in analog and hybrid integrated circuits, and its performance greatly affects the performance of the system. For different application fields, the system has different performance requirements for OTA. In OTA-based circuits such as power management, the system has high requirements for the transient response speed of OTA. The important parameter of OTA to characterize the transient response speed is the settling time. The settling time includes the slew rate stage and the small signal settling stage. Improving the response speed of the slew rate stage requires increasing the slew rate (SR) of the OTA, but increasing the slew rate requires increasing the maximum available output current of the syste...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
CPCH03F3/45
Inventor 李思臻吴锋霖余凯章国豪
Owner GUANGDONG UNIV OF TECH
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