A high-spurious-suppression fine-stepping agile frequency conversion frequency synthesis device and method

Abstract

The invention discloses a fine stepping frequency agility frequency synthesis device and method with high spurious suppression. The device and the method comprises: the constant-temperature crystal oscillator is used for outputting a reference signal; the harmonic generator is connected with the constant-temperature crystal oscillator; the reference clock frequency selection circuit, a low-frequency selection circuit and a high-frequency selection circuit are connected with the harmonic generator; the input end of the DDS circuit is connected with the reference clock frequency selection circuit; the first intermediate frequency selection circuit is connected with the output end of the DDS circuit; wherein the first frequency mixer is connected with the first intermediate frequency selection circuit and the low frequency selection circuit, the second intermediate frequency selection circuit is connected with the first frequency mixer, the second frequency mixer is connected with the second intermediate frequency selection circuit and the high frequency selection circuit, and the filter amplification circuit is connected with the second frequency mixer. According to the technical scheme, the frequency synthesis device and method meet the requirements of high spurious suppression, fine stepping and frequency agility at the same time. Therefore, the method is suitable for popularization and application.

Description

Technical field [0001] The invention relates to the field of frequency synthesis, and in particular to a high spurious suppression fine step frequency agile frequency synthesis device and method. Background technique [0002] With the development of modern electronic complete machine equipment towards rapid response and high electromagnetic compatibility, the internal functional circuit of the complete machine must also conform to this trend. Frequency synthesis devices are widely used in the fields of testing instrumentation, radar, electronic countermeasures and communications, and these fields basically require fast response characteristics, so the frequency hopping time of frequency synthesis devices is also very demanding. At the same time, for radars, test instruments and other equipment that are mainly used to identify targets, the finer the frequency resolution (frequency step) and the higher the spurious suppression are conducive to more accurate target recognition. In ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a fine-step-agile frequency synthesis device and method with high spurious suppression, mainly to solve the problem that the existing frequency synthesis device cannot simultaneously meet the high Issues with spur rejection, fine stepping, and frequency-agile requirements

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