Down-conversion system of multi-channel broadband

Abstract

The invention discloses a down-conversion system of multi-channel broadband. A four-channel broadband microstrip filter set, a mixing circuit and an intermediate frequency signal regulating circuit are integrated in the system, and the 4GHz-12GHz segmenting filtering and down-conversion function is completed. The high and low local oscillator combined frequency conversion mode is adopted for the down-conversion system, the intermediate frequency is 1.9214 GHz, 4GHz-12GHz radio frequency is input through the four channels to respectively perform pre-selection filtering on input signals, and mirror image interference is eliminated. Then, gating is performed through a microwave chip SP4T switch based on secondary packaging, the signals subjected to the gating are transmitted to the mixing circuit so that intermediate frequency signal can be obtained, and the signals are uniformly output after being regulated. In the segmenting switch switching mode, radio frequency signals are subjected to segmenting filtering, and interference of mirror image signals is reduced. The high and low local oscillator combined mode is adopted, namely, 5.9214-10.0786 GHz local oscillator signals are adopted, local oscillator resources are saved, and the 4-12 GHz mirror image suppression down-conversion function can be achieved under PXI single-groove size.

Description

Technical field [0001] The invention belongs to the technical field of miniaturized microwave broadband down-conversion, and in particular relates to a multi-channel broadband down-conversion system. Background technique [0002] With the development of microwave test systems, the requirements for the use of miniaturization and broadband for microwave test systems have further increased. The current down-conversion components generally adopt the independent design of each internal functional module, and then carry out the idea of ​​secondary integrated design. This kind of design is larger or only realizes the function of signal analysis and cannot complete the function of spectrum measurement in the frequency band. To ensure the realization of broadband spectrum measurement functions and further miniaturization, the design of radio frequency circuits and structures has become a bottleneck in the development of miniaturized broadband microwave test components. Summary of the inv...

AI Technical Summary

Problems solved by technology

The current down-conversion components generally adopt the idea of ​​independent design of internal functional modules, and then carry out secondary integration design. This kind of design is large in size or only realizes the function of signal analysis and cannot complete the function of using in-band spectrum measurement.

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