Multichannel low noise amplifier

Abstract

The invention discloses a multichannel low noise amplifier. The multichannel low noise amplifier comprises an LNA body, a second-level amplifier, a first duplexer, a low-frequency-band filter, a high-frequency-band filter, a second duplexer and a third-level amplifier, wherein the LNA body, the second-level amplifier and the first duplexer are connected in sequence, the output end of the first duplexer is divided into two branches, one branch is connected with the low-frequency-band filter, the other branch is connected with the high-frequency-band filter, the output end of the low-frequency-band and the output end of the high-frequency-band filter are combined to be connected to the second duplexer, and the output end of the second duplexer is connected with the third-level amplifier. According to the multichannel low noise amplifier, three-level amplification is achieved so that the gain of a signal can be high enough, the signal is divided into branches to be processed, multiple channels are achieved, out-of-band rejection of each branch of signal is guaranteed through a corresponding filter, the structure is simple, and performance is stable.

Description

technical field [0001] The invention relates to a low noise amplifier, in particular to a multi-channel low noise amplifier. Background technique [0002] As the most important device of the RF front-end, the low-noise amplifier's performance basically determines the signal quality of the RF channel. With the development of communication technology, communication circuits have higher and higher requirements for the performance of low-noise amplifiers, especially Beidou The technology of simultaneous processing of multi-channel signals requires low-noise amplifiers to not only have sufficiently low noise, but also require multiple channels to amplify signals in different frequency bands, and also require different multipliers of signal amplification in different frequency bands. Channel low-noise amplifiers came into being, but the out-of-band suppression of multi-channel low-noise amplifiers often cannot meet the requirements of communication circuits. Contents of the inve...

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Problems solved by technology

[0002] As the most important device of the RF front-end, the low-noise amplifier's performance basically determines the signal quality of the RF channel. With the development of communication technology, communication circuits have higher and higher requirements for the performance of low-noise amplifiers, especially Beidou The technology of simultaneous processing of multi-channel signals requires low-noise amplifiers to not only have sufficiently low noise, but also require multiple channels to amplify signals in different frequency bands, and also require different multipliers of signal amplification in different frequency bands. Channel low-noise amplifiers came into being, but the out-of-band rejection of multi-channel low-noise amplifiers often cannot meet the requirements of communication circuits

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