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Wideband low noise amplifier

A broadband low-noise, amplifier technology, applied in amplification control, improving amplifiers to reduce noise effects, electrical components, etc., can solve the problems of deteriorating the noise performance of broadband amplifiers, unable to achieve simultaneous optimization, etc., to avoid the use of RF inductors, Good broadband impedance matching performance, the effect of realizing gain control

Active Publication Date: 2013-09-04
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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Problems solved by technology

However, the inventors of the present invention have found that most of the current low-noise broadband amplifiers use very complicated feedback loops to realize broadband impedance matching networks, which include multiple active devices, and the key is that the noise of these active devices is often will deteriorate the noise performance of the entire broadband amplifier, then there must be a contradictory relationship between bandwidth and noise performance, making it impossible to optimize these two performance indicators simultaneously

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Embodiment Construction

[0022] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

[0024] The first embodiment of the present invention relates to a broadband low noise amplifier. figure 2 Is the structure diagram of the wideband low noise amplifier. Such as figure 2 As shown, the broadband low noise amplifier includes an input amplifier stage circuit and a load output circuit.

[0025] The load output circuit is used to re...

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Abstract

The invention relates to semiconductor devices, and discloses a wideband low noise amplifier. The wideband low noise amplifier utilizes a cross coupling transistor network as a wideband impedance matching network, can achieve characteristics similar to pure resistance in a wide frequency band, is simple in circuit structure, and achieves good wideband impedance matching performance on the premise that noise is not eliminated, namely achieves simultaneous optimization of noise performance and wideband performance. Compared with a traditional low noise amplifier, the wideband low noise amplifier avoids a radio frequency inductor, largely lowers the size of a chip, and can reduce the size of the chip by more than 80%.

Description

technical field [0001] The present invention relates to semiconductor devices, in particular to broadband low noise amplifiers. Background technique [0002] Low-noise amplifiers generally refer to amplifiers with low noise figures, which are generally used as high-frequency or intermediate-frequency preamplifiers for various radio receivers, and amplifying circuits for high-sensitivity electronic detection equipment. It is usually used as the first stage of this type of electronic equipment. In the case of amplifying weak signals, the noise of the amplifier itself may seriously interfere with the signal. Therefore, it is hoped to reduce this noise to improve the signal-to-noise ratio of the output. Therefore, its noise performance largely determines the sensitivity of the overall system. [0003] However, in addition to noise performance, its other technical index, high-frequency impedance matching characteristics, cannot be ignored. In high frequencies, especially radio ...

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Application Information

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IPC IPC(8): H03F1/26H03G3/20
Inventor 章琦汪宁袁盾山汪辉陈杰
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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