A Broadband Agile Frequency Source Based on Dual Phase-Locked Loops

Abstract

The invention discloses a broadband frequency agility frequency source based on double phase-locked loops. The broadband frequency agility frequency source based on the double phase-locked loops comprises a crystal oscillator, a first-level phase-locked loop part, a frequency division filtering part, a second-level phase-locked loop part and a controllable frequency division part, wherein the crystal oscillator provides reference signals for the first-level phase-locked loop part, the first-level phase-locked loop part carries out frequency selection according to the reference signals provided by the crystal oscillator, the frequency division filtering part carries out frequency diversion on frequency points selected by the first-level phase-locked loop part to obtain reference signals of the second-level phase-locked loop part, the second-level phase-locked loop part carries out frequency agility modulation and broadband frequency modulation according to the reference signals provided by the frequency division filtering part to obtain broadband frequency modulation signals, and the controllable frequency division part expands the frequency bandwidth of the broadband frequency modulation signals to obtain output signals of the needed frequency bandwidth. The broadband frequency agility frequency source based on the double phase-locked loops achieves the design purposes of low stray, wide frequency band and frequency agility, can improve the stray indicators, shortens the system locking time, improves the reliability of the system, and has good economical benefits and broad application prospects.

Description

technical field [0001] The invention relates to the field of frequency source design, in particular to a broadband-agile frequency source based on double phase-locked loops. Background technique [0002] With the development of modern communication technology, the role of frequency sources in communication is becoming more and more important. In the RF front-end of systems such as communication radar, wireless communication, microwave test equipment, and spectrum monitoring, it is necessary to use microwave frequency sources with broadband, low spurious, and low phase noise to improve the anti-interference ability of the system and the confidentiality of communication. The microwave frequency source is the heart of a microwave system, which determines the performance of the system. In the high-precision ranging radar, the microwave frequency source determines the radar distance resolution and other indicators. With the development of RF and microwave test equipment such as...

AI Technical Summary

Problems solved by technology

These techniques enable frequency sources to generate a wide variety of frequency signals that can meet various needs, but are also accompanied by some problems, such as spurious

In general, spurs can only be eliminated by selecting a specific frequency point in the frequency source or using a filter

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