Radio frequency architecture of broadband communication system

Abstract

The invention provides a radio frequency architecture of a broadband communication system. The radio frequency architecture is composed of a broadband transceiver, a broadband transmitting / receiving module and a broadband antenna, the broadband transmitting module mainly comprises a broadband power amplifier, band-pass filters of multiple frequency bands, a single-pole N-throw switch and the like.The receiving module comprises a broadband low-noise amplifier, band-pass filters of multiple frequency bands and a single-pole N-throw switch. According to the invention, it is achieved that the broadband communication system is capable of carrying out multi-frequency band receiving and transmitting and is simple in structure and relatively low in cost.

Description

technical field [0001] The invention relates to the field of radio frequency front end, more specifically, it relates to the radio frequency architecture of the broadband communication system. Background technique [0002] Currently, multiple modes and multiple frequency bands coexist in the mobile communication system, and the market hopes that a single mobile terminal can support different communication protocols and frequency bands. With the rapid development of integrated circuits, RF front-end modules are also developing in the direction of miniaturization, broadband and high frequency, and their performance is directly related to the communication quality of the entire communication system. [0003] The RF front-end module plays an important role in the communication system. When transmitting the signal, it converts the digital signal into a high-frequency wireless electromagnetic wave signal and amplifies the signal power, and at the same time filters and suppresses t...

AI Technical Summary

Problems solved by technology

When the broadband RF front-end module is working, there are many electromagnetic interferences in its wide frequency range, which will deteriorate the performance of the communication system

For example, the even-order harmonic distortion caused by the leakage signal of the transmitter and the adjacent channel interference signal with strong downlink power, its second-order nonlinear intermodulation appears in the baseband in the form of the square of the envelope amplitude of the interference signal, and falls on the channel Within the bandwidth range, the signal-to-noise ratio of the degraded signal

In addition, there are interference signals such as co-frequency interference, blocking interference, spurious interference, and intermodulation interference.

[0005] The traditional approach is to add a harmonic suppression low-pass filter to the transmitting branch to reduce the emission of harmonic spurious products, or to add an anti-blocking band-pass filter to the receiving branch to reduce the risk of blocking interference to the channel by out-of-band interference products. However, this method has high requirements on the out-of-band suppression performance of the filter, and its production cost is extremely high.

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