Broadband low-noise amplifier, chip and radio frequency receiver

Abstract

The invention discloses a broadband low-noise amplifier, a chip and a radio frequency receiver. The amplifier comprises a first-stage amplification circuit, a second-stage amplification circuit and a third-stage amplification circuit, wherein the first-stage amplification circuit adopts a cascode structure; an n-shaped input matching structure is arranged at the input end of the first-stage amplifying circuit, and the n-shaped input matching structure is composed of a first capacitor, a first inductor and a parasitic capacitor of a first transistor; the first-stage amplification circuit is further provided with a resistance feedback structure, the resistance feedback structure comprises a first resistor, one end of the first resistor is connected to the grid electrode of the first transistor, and the other end of the first resistor is connected to the drain electrode of the second transistor; the grid of the second transistor is connected with power voltage through a second inductor; and the second-stage amplifying circuit adopts a cascode structure. According to the invention, the first-stage amplification circuit is combined with an n-shaped input matching structure and a resistance feedback structure, so that flat gain is realized; and an inductor is added to the grid electrode of the second transistor, so that a wider bandwidth is realized. The invention can be widely applied to the field of integrated circuits.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a broadband low-noise amplifier, a chip and a radio frequency receiver. Background technique [0002] In order to be compatible with a variety of wireless communication standards and meet the needs of the market and industry for high-speed communication, multi-standard integration, and economical portability, UWB transceivers play an increasingly important role in modern wireless communication receiving systems. The Low Noise Amplifier (LNA) is an important part of the wireless communication system, and it is the first module with amplification capability in the RF receiver. Its performance will affect the quality of the entire receiving system. Ultra-wideband wireless communication systems require LNAs to also have broadband amplification capabilities. The main function of the LNA is to amplify the weak signal received from the antenna under the premise of introducing as litt...

AI Technical Summary

Problems solved by technology

However, the overall circuit is three-stage. Although the gain is increased, it will increase power consumption and consume more circuit area. Multi-stage cascading may also increase noise.

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