Low-phase noise frequency source circuit and implementation method

Abstract

The invention provides a low-phase-noise frequency source circuit and an implementation method. The circuit comprises a power divider module, a first PLL module, a second PLL module, a phase shifter module, a combiner module, a coupler module and a detector module, wherein the first PLL module and the second PLL module are respectively connected with two paths of outputs of the power divider module; the phase shifter module is connected with the second PLL module; the combiner module is connected with the first PLL module and the phase shifter module; and a controller module connected with the detector module, wherein the controller module is connected with the first PLL module, the second PLL module and the phase shifter module. The phase of the output signal of the second PLL module is adjusted through the detector module, the controller module and the phase shifter module until the phase difference between the output signal of the first PLL module and the adjusted output signal of the phase shifter module reaches the combiner module is zero. According to the scheme, a lower phase noise index is achieved, the phase adjustment time can be shortened, the phase difference can be rapidly adjusted to be zero, and the frequency output time is shortened.

Description

technical field [0001] The invention relates to the technical field of radio frequency microwaves, in particular to a low phase noise frequency source circuit and an implementation method. Background technique [0002] The frequency source is the core device in modern RF microwave components, and the quality of the output signal determines the performance of the system. For example, in the precise positioning of missile guidance and satellite communication, the accuracy requirements are very high, and the frequency source requires very high stability. Secondly, the frequency source provides local oscillator signals for various receivers, participates in spectrum shifting, and also serves as a reference for the signal processor, providing it with a clock signal. Therefore, its performance indicators play a decisive role in the entire working system. [0003] Phase noise is one of the most important indicators of modern frequency sources. Low phase noise means that the baseb...

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Problems solved by technology

[0004] Prior art CN112290942A discloses an ultra-fast ultra-bandwidth low-noise band-agile frequency source. Although a low-phase-noise frequency source is realized, it is difficult to achieve low Spurious frequency output; the prior art CN207490869U discloses an ultra-low phase noise frequency source circuit, which optimizes the phase noise of the signal by eliminating related phase noise. Although the phase noise can be optimized, the circuit has a complex structure and is difficult to debug. And can only output some fixed point frequency

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