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Low-noise amplifier

A low-noise amplifier and amplifying tube technology, applied in the direction of improving the input/output impedance of the amplifier, improving the amplifier to reduce the influence of noise, etc., can solve the problem of applying the low-noise amplifier to the frequency f0, etc., and achieve the effect of improving work efficiency

Inactive Publication Date: 2013-03-20
SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, for a traditional low-noise amplifier, specific matching input inductance L1, source degeneration inductance L2, and cross-connection capacitance Cgs can achieve impedance matching at a specific frequency f0, but this also means that the low-noise amplifier is only Can be used at frequency f0

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Embodiment Construction

[0025] In order to make the content of the present invention clearer and easier to understand, the content of the present invention will be further described below in conjunction with the accompanying drawings. Of course, the present invention is not limited to this specific embodiment, and general replacements known to those skilled in the art are also covered within the protection scope of the present invention.

[0026] The low noise amplifier of the present invention includes an input matching inductor L1, a plurality of control switches and an amplifier tube M1. Among them, the input matching inductor L1 includes a spiral coil wound by a wire located on the top metal layer, and the number of turns of the spiral coil is at least one turn. Different parts of the wire also have multiple lead-out terminals. The metal layer is drawn out. One end of the wire is used as the input end of the input matching inductor, and these lead-out terminals can be used as the output end of t...

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Abstract

The invention discloses a low-noise amplifier, which comprises at least one spiral coil, a plurality of control switches and an amplifier tube, wherein the spiral coil is formed by a conducting wire in a winding way, the different positions of the conducting wire are provided with a plurality of leading-out end points, one end of the conducting wire is used as the input end of an input matching inductor and the leading-out end points are used as the output ends of the input matching inductor; the control switches are correspondingly connected with the leading-out end points and are turned on or off according to control signals to lead out the leading-out end points at different positions of the input matching inductor, so as to switch the inductance of the input matching inductor; and the amplifier tube is connected with the output ends of the control switches. By adopting the technical scheme, the low-noise amplifier can work at different frequencies.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a frequency-variable low-noise amplifier. Background technique [0002] The low-noise amplifier (Low-Noise Amplifier, LNA) is one of the important modules in the radio frequency transceiver, and its performance plays a decisive role in the whole transceiver system. The low noise amplifier is mainly used in the communication system to amplify the signal received from the antenna, so as to facilitate the processing of the receiver circuit in the subsequent stage. Since the signal from the antenna is generally very weak, the low noise amplifier is generally located very close to the antenna to reduce signal loss. [0003] It is precisely because the low-noise amplifier is located at the first stage of the entire receiver close to the antenna, its characteristics directly affect the quality of the signal received by the entire receiver. To ensure that the signal received by the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26H03F1/56
Inventor 李琛张远方泽姣
Owner SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT
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