Broadband low-noise amplifier with reconfigurable frequency band

Abstract

The invention provides a broadband low-noise amplifier with a reconfigurable frequency band, and belongs to the technical field of radio frequency integrated circuits. According to the amplifier, a broadband signal is divided into two frequency band signals through a coupling line structure, so that a circuit can be optimally designed according to the noise, gain and other performance of each section of signal, frequency reconfiguration is achieved through switching of the single-pole double-throw switch, and the amplifier has the advantages of being low in noise, high in gain and reconfigurable in broadband. Meanwhile, the flexibility of circuit design is improved, miniaturization and integration of a communication system are better facilitated, implementation is easy, and good practical value is achieved.

Description

technical field [0001] The invention belongs to the technical field of radio frequency integrated circuits, and in particular relates to a broadband low-noise amplifier with reconfigurable frequency bands. Background technique [0002] Nowadays, with the rapid development of wireless communication technology, industries such as mobile phones, wireless local area networks, Internet of Things, and digital high-definition televisions have brought about tremendous changes in people's daily lives, and at the same time, they have also put forward higher requirements for RF chip design technology. The functional integration of many application devices is getting higher and higher, and a certain system often integrates multiple functional subsystems. Taking civilian mobile phones as an example, it also integrates functions such as GSM, W-CDMA, 5G, WIFI, Bluetooth and navigation. Each sub-functional system of the receiver front end of traditional multi-functional integrated equipmen...

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Problems solved by technology

Although balanced amplifiers can work in the best noise or maximum gain state, there are problems of large circuit size and high power consumption due to the need for two hybrid networks and two separate amplifiers; the bandwidth of a distributed amplifier is very wide, theoretically The cut-off frequency of the transistor can be achieved on the above, but due to the use of multiple spiral inductors or transmission lines, the chip area is large and the power consumption is high; the parallel-series feedback structure can provide good broadband matching and gain over the entire broadband, but it is difficult Satisfy the balance between noise and gain

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