Radio frequency signal receiving circuit, circuit board, chip and terminal

Abstract

An embodiment of the invention discloses a radio frequency signal receiving circuit, a circuit board, a chip and a terminal. The radio frequency signal receiving circuit comprises an antenna circuit,a first filter circuit, a switch circuit, a second filter circuit, a low-noise amplifying circuit and a mixing circuit; the second filter circuit includes a first sub-filter circuit and a second sub-filter circuit; the first sub-filter circuit includes first filter device F1, second filter device F2, third filter device F3 and fourth filter device F4; the first end of the first filter device F1 isconnected with the first end of the first filter device F2, the second end of the first filter device F1 is connected with the first end of the first filter device F3, the second end of the first filter device F3 is connected with the first end of the first filter device F4, and the second end of the first filter device F4 is connected with the second end of the first filter device F2. The radiofrequency signal receiving circuit enables signal processing effect of a modulator to be improved to certain degree.

Description

technical field [0001] The invention relates to the technical field of circuit structures, in particular to a radio frequency signal receiving circuit, a circuit board, a chip and an Internet of Things terminal. Background technique [0002] The Internet of Things is widely used in the fusion of networks through communication perception technologies such as intelligent perception, identification technology and pervasive computing. Therefore, it is called the third wave of the development of the world's information industry after computers and the Internet. The rapid development and application of Internet of Things technology means that the requirements for communication technology are getting higher and higher, and the transmission of communication signals is facing more and more challenges. [0003] In the process of transmitting and transmitting signals from existing IoT terminals, there are problems of short transmission distance and high degree of signal interference. W...

AI Technical Summary

Problems solved by technology

[0003] In the process of transmitting and transmitting signals from existing IoT terminals, there are problems such as short transmission distance and high degree of signal interference. When interference is encountered, the filtering effect of IoT terminals on received signals will be weakened, thus As a result, the signal-to-noise ratio of the received signal is reduced, which is not conducive to the processing of the signal by the modem

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