Low power broadband transconductance error amplifier

An error amplifier and differential amplifier technology, which is applied in the field of low-power wideband transconductance error amplifiers, can solve the problems of increasing amplifier power consumption, complicated design of common mode feedback circuit, etc. The effect of improving the common mode rejection ratio

Pending Publication Date: 2018-09-28
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0004] The invention provides a low-power broadband transconductance error amplifier, which is used to solve the technical problem that the design of the traditional common-mode feedback circuit is relatively complicated, and the power consumption of the amplifier is increased to a certain extent.

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  • Low power broadband transconductance error amplifier

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Embodiment Construction

[0045] The invention provides a low-power broadband transconductance error amplifier, which is used to solve the technical problem that the design of the traditional common-mode feedback circuit is relatively complicated and the power consumption of the amplifier is increased to a certain extent.

[0046] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention. 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.

[0047] For ease of understanding, see ...

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Abstract

The invention discloses a low power broadband transconductance error amplifier. A differential amplifier with a common mode feedback loop is designed at a first stage, so a common mode rejection ratioof a circuit is improved, and an output common mode level is stabilized. According to the design, gain and swing of the first stage can be further improved. Moreover, a common source level and classAB output level amplifier is employed at a second stage, the transconductance and circuit drive capability of the transconductance error amplifier are improved, and further a unit gain bandwidth of the circuit is improved. The design of a common mode negative feedback circuit is simplified, moreover, the power consumption is reduced, the stability of the circuit is improved, and the technical problem that the power consumption of the amplifier is increased to a certain degree due to the fact that the design of the traditional common mode negative feedback circuit is relatively complex is solved.

Description

technical field [0001] The invention relates to the technical field of circuit amplifiers, in particular to a low-power broadband transconductance error amplifier. Background technique [0002] The operational transconductance amplifier, often referred to as (OTA), is an operational amplifier whose input voltage controls the output current. It is the basic unit in the analog integrated circuit and the basic module that constitutes many analog integrated circuit systems. For example, the operational amplifier (OPA) is composed of an operational transconductance amplifier and a buffer output stage, and the operational amplifier is the most commonly used unit circuit in linear circuits, accounting for about 20% of the total analog integrated circuits. Operational amplifiers are widely used in analog operations, signal processing, analog-to-digital conversion, and active filters. Compared with the operational amplifier, OTA has a simpler circuit structure, which greatly reduces...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F3/68
CPCH03F3/45636H03F3/68
Inventor 龚利平李思臻余凯周盼
Owner GUANGDONG UNIV OF TECH
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