Dual-frequency broadband high-gain low-noise amplifier

Abstract

The invention discloses a double-frequency broadband high-gain low-noise amplifier. The amplifier comprises a first amplifying circuit module, a second amplifying module and a third amplifying module; the second amplifying module is connected with the first amplifying module and the third amplifying module respectively; the first amplifying module, the second amplifying module and the third amplifying module respectively comprise a direct current bias circuit, an input matching circuit, an amplification element and an output matching circuit, and an input signal RFin is subjected to three-stage amplification to obtain an output signal RFout. According to the invention, cascade connection of three stages of amplification elements is completed by adopting broadband matching and gain compensation technologies, functions of double-frequency broadband, high gain and low noise coefficient are realized, and the amplifier has the advantages of clear circuit structure, stable circuit, controllable gain flatness and the like; the defects of low gain and high noise coefficient caused by the fact that a traditional communication system selects a sacrifice noise coefficient and gain to obtain broadband characteristics are overcome.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a dual-frequency broadband high-gain low-noise amplifier. Background technique [0002] At present, the field of radio frequency communication systems is developing rapidly, and the requirements for the performance indicators of low noise amplifiers are becoming more and more stringent. As the first active circuit at the receiving end, the low noise amplifier needs a suitable DC bias to ensure the stable operation of its transistors. At the same time, due to the development of various devices towards miniaturization and low cost, the design of low noise amplifiers must not only meet the requirements of miniaturization and low cost, but also meet the requirements of maintaining a high level of performance, such as high gain, low Noise, broadband, etc. [0003] The low-noise amplifier is a very important module in the communication link. It is located at the front end of the...

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Problems solved by technology

[0004] However, the inventor found that in the existing technology, on the one hand, the noise figure and gain are often sacrificed to obtain broadband characteristics, which deteriorates the noise figure and reduces the gain, which will not be conducive to achieving optimal performance in each frequency band

Especially for communication systems that require high gain and noise figure, the existing technology that sacrifices noise figure and gain to obtain broadband will not be able to meet the above requirements; on the other hand, traditional matching circuit structures use L-shaped matching networks, that is, double Component matching network, the disadvantage of this matching network is narrowband, not suitable for broadband communication systems, and the flexibility of matching is also poor

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