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Low-power low-noise amplifier utilizing positive feedback technique and active transconductance enhancement technique

A low-noise amplifier, transconductance enhancement technology, applied in the direction of improving the amplifier to reduce the influence of noise, etc., can solve the problems of high noise figure and large power consumption of the low-noise amplifier, and achieve high gain, good noise performance, and suppress noise contribution. Effect

Active Publication Date: 2015-01-07
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0007] The purpose of the present invention is to provide a low-power low-noise amplifier using positive feedback technology and active transconductance enhancement technology to solve the problems of large power consumption and high noise figure of low-noise amplifiers with low-power common-gate structures

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  • Low-power low-noise amplifier utilizing positive feedback technique and active transconductance enhancement technique
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  • Low-power low-noise amplifier utilizing positive feedback technique and active transconductance enhancement technique

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[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, 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.

[0031] The invention provides a low power consumption and low noise amplifier adopting positive feedback technology and active transconductance enhancement technology. The active transconductance enhancement technology is adopted for the purpose of reducing power consumption. After analyzing the noise, it is concluded that the noise contribution of the transistor used in the active transconductance enhancement part is inversely proportional to its own transcond...

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Abstract

The present invention presents a low-power low-noise amplifier utilizing a positive feedback technique and an active transconductance enhancement technique, achieving properties like low power consumption and low noise. Main circuit structures are that: a balanced-unbalanced transformer (1), an amplifier (2) utilizing an active transconductance enhancement and capacitance cross-coupling technique, a main common-gate amplifier stage (3), a positive feedback branch (4) and a resistance load (5). The present invention performs active transconductance enhancement on a common-gate amplifier and uses capacitance cross-coupling technique for the active transconductance enhanced portion, achieving higher equivalent transconductance. A positive feedback branch is introduced, increasing adjustment freedom degree of equivalent transconductance for the common-gate amplifier, reducing constraints between noise and input matching, improving noise property and meanwhile achieving a high gain at lower power consumption. The present invention is simple in structure, small in occupation area and easy to achieve.

Description

technical field [0001] The invention relates to a low-power-consumption low-noise amplifier using positive feedback technology and active transconductance enhancement technology, which has the characteristics of low noise figure and low power consumption, and belongs to the technical field of radio frequency integrated circuits. Background technique [0002] With the prosperity and development of the personal wireless communication market, people have higher and higher performance requirements for various wireless communication tools. Wireless communication technology has become high-speed and ultra-wideband. A complete RF transceiver system includes RF front-end and baseband processing. The radio frequency front-end (also known as the transceiver) determines the basic performance index of this system. As the key module of the receiver in the wireless transmission system, the low-noise amplifier is generally directly connected to the antenna. The low-noise amplifier is use...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26
Inventor 陈岑孙景业刁盛锡林福江
Owner UNIV OF SCI & TECH OF CHINA
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