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transconductance amplifier

A technology of transconductance amplifiers and MOS tubes, which is applied in the field of transconductance amplifiers, can solve the problems of instability of transconductance amplifiers and low unity gain bandwidth, and achieve the effects of reducing the influence of frequency characteristics, improving unity gain bandwidth, and increasing amplitude

Active Publication Date: 2019-01-04
NO 24 RES INST OF CETC
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Problems solved by technology

[0004] The invention provides a transconductance amplifier to solve the problems of low unity gain bandwidth and instability of the transconductance amplifier when frequency compensation is performed on the transconductance amplifier

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Embodiment Construction

[0026] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the following describes the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings For further detailed explanation.

[0027] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be Directly connected or indirectly connected through an intermediary, those skilled in the art can understand the specific meanings of the above terms according to specific situations.

[0028] see figure 1 , is a ...

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Abstract

The present invention provides a transconductance amplifier comprising an input circuit, a gain circuit and an output circuit which are successively connected. The gain circuit comprises a MOS transistor array composed of a plurality of MOS transistors, grids of the corresponding MOS transistors between every two adjacent columns of the MOS transistor array are connected, the MOS transistors in each column of the MOS transistors are successively connected, and compensation capacitors are arranged between asymmetrical connection points of the MOS transistors in the output column of the MOS transistor array and an output terminal of the output circuit. According to the transconductance amplifier, compared with a traditional frequency compensation technology, dominant pole frequency of the transconductance amplifier can be reduced through increasing capacitance values of the compensation capacitors, right half plane zero frequency of the transconductance amplifier can also be prevented from being reduced, so that a distance between the dominant pole frequency and the right half plane zero frequency of the transconductance amplifier can be increased, the influence of frequency compensation on frequency characteristics of the transconductance amplifier can be reduced, unity-gain bandwidth of the transconductance amplifier can be improved, and the problem that the transconductance amplifier is possibly unstable can be solved.

Description

technical field [0001] The invention belongs to the field of analog or digital-analog hybrid integrated circuits, and in particular relates to a transconductance amplifier. Background technique [0002] In recent years, with the continuous development of integrated circuit design technology, transconductance amplifiers are more and more used in the field of analog integrated circuit design. In order to obtain a larger phase margin, frequency compensation is usually performed on the transconductance amplifier. The traditional frequency compensation technique is to reduce the frequency of the main pole of the transconductance amplifier. Specifically, a transconductance amplifier generally includes an input circuit, a gain circuit and an output circuit. In the prior art, a compensation capacitor is usually provided between the output end of the gain circuit and the output end of the output circuit, and the dominant pole frequency of the transconductance amplifier is reduced by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/42H03F3/45
CPCH03F1/42H03F3/45632
Inventor 徐代果胡刚毅李儒章王健安刘涛刘璐邓民明石寒夫王旭
Owner NO 24 RES INST OF CETC
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