Signal processing circuit

Abstract

A signal processing circuit comprises a first frequency synthesizer, a second frequency synthesizer, a first radio-frequency circuit, a first analog front end circuit, a second radio-frequency circuit and a second analog front end circuit; wherein, the first frequency synthesizer and the second frequency synthesizer are respectively used for generating a first frequency and a second frequency; the first radio-frequency circuit is coupled with the first frequency synthesizer; the first analog front end circuit is coupled with the first radio-frequency circuit; the second radio-frequency circuit is coupled with the second frequency synthesizer; and the second analog front end circuit is coupled with the second radio-frequency circuit; wherein, the first radio-frequency circuit and the first analog front end circuit can support signal transmission of a first frequency band, and the second radio-frequency circuit and the second analog front end circuit can support signal transmission of a second frequency band; the center frequency of the first frequency band is equal to the first frequency, and the center frequency of the second frequency band is equal to the second frequency.

Description

technical field [0001] The present invention relates to a signal processing circuit, in particular to a signal processing circuit with multiple frequency synthesizers. Background technique [0002] In wireless local-area network (WLAN) applications, in order to achieve a higher transmission rate and better transmission quality, the signal processing circuit of the wireless network is usually combined with a multiple-input multiple-output (multiple-input multiple-output, MIMO technology, which uses multiple antennas to send and receive multiple independent signal streams. [0003] In addition, in order to increase the data transmission rate, the most effective and direct way is to increase the transmission bandwidth of the signal. For example, the traditional information frequency band of the wireless network system is 20MHz. However, the current wireless network technology can already Allows expansion of the 20MHz frequency band to a 40MHz frequency band for faster data tra...

AI Technical Summary

Problems solved by technology

In this way, the two 20MHz signals will interfere with each other's images (that is, when performing signal analysis, one of the signals will become the noise of the other signal), therefore, after the subsequent During signal analysis (such as the down-sampling operation performed by the subsequent analog front-end circuits 131-134), it will cause signal distortion

[0008] In addition, due to the limitation of a single frequency synthesizer, before switching the signal bandwidth, the signal processing circuit 100 cannot detect in advance whether the adjacent channel is a clean channel

In this way, when the signal processing circuit 100 switches to 40MHz signal transmission, the packets to be transmitted may collide with the packets being transmitted by other users, and in severe cases, the data throughput will not increase instead. drop

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