Expansion method for continuous operation bandwidth of frequency synthesizer and mixing system

Abstract

The invention discloses an expansion method for the continuous operation bandwidth of a frequency synthesizer and a mixing system. The method comprises the following steps of: performing mixing twice by using the frequency synthesizer, wherein a first frequency source F1 and a second frequency source F2 perform primary mixing, and output frequency obtained by the primary mixing and a third frequency source F3 perform secondary mixing; selecting an upper sideband and a lower sideband generated by frequency conversion for the primary mixing, and selecting the upper sideband generated by the frequency conversion for the secondary mixing; in order to obtain a continuously adjustable frequency range, filling a gap between the upper sideband and the lower sideband after the primary mixing and the secondary mixing, and then determining value relations among the frequency sources F1, F2 and F3 and among the adjustable frequency ranges of the F1, the F2 and the F3; and valuing the F1, the F2, the F3 and the adjustable frequency ranges thereof according to the value relations to expand the adjustable frequency range of the output frequency Fout of the frequency synthesizer. Moreover, by the mixing system based on the expansion method for the continuous operation bandwidth, the addition of equipment is not required, and cost is low.

Description

technical field [0001] The invention relates to the technical field of microwave signal frequency generators, in particular to a method for expanding the continuous working bandwidth of a frequency synthesizer and a frequency mixing system. Background technique [0002] Frequency-stable, phase-stable (coherent) frequency sources are key components of electronic equipment. With the development of telecommunications, radar, air defense weapons, atmospheric detection and other technologies, higher requirements are put forward for the frequency source, such as making the working (adjustable) frequency range wider, frequency shifting faster (agile), frequency step Into finer, higher signal purity and so on. The method of frequency mixing between multiple coherent sources is a common method to meet the above requirements. [0003] Generally, each coherent source can be composed of three frequency synthesis techniques: direct frequency synthesis, phase-locked frequency synthesis,...

AI Technical Summary

Problems solved by technology

Usually, when multiple coherent sources are used for frequency mixing, only one of the lower sideband and upper sideband generated by frequency mixing is often used, which narrows the continuously agile and adjustable working bandwidth of the entire frequency source.

If you need to ensure a wide working bandwidth, you need to add equipment, which not only increases the cost of the system, but also makes the system architecture very cumbersome

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