Research On Miniaturized Fast Hopping Frequency Synthesis Technology

Frequency sources are important components of electronic systems and play an extremely important role in the fields of electronics,communications,aerospace,and national defense.With the development of electronic systems towards miniaturization,miniaturization is pursued by frequency source.And frequency source is developing towards low phase noise,low spurious,high frequency hopping,and large broadband.A frequency source with domestically made hardware,powerful functions,and excellent performance indicators is of great meaning in the aspects of electronic warfare,communication,and other fields.In this paper,the miniaturized frequency agile frequency synthesis technology has been studied,and the specific work is as follows:Based on the performance indicators that need to be achieved in the research,this paper attempts to use phase-locked loops to achieve the goals of miniaturization,low spurious,low phase noise,and fast frequency hopping.Using multiple phase-locked loops for ping-pong switching,achieving fast frequency hopping;Two physical production methods: LTCC process based on Si P packaging and loading PCB substrate into metal cavity.Based on the theory of phase locked loop frequency synthesis,this article uses phase noise evaluation software to debug and optimize the parameters of each part of the phase locked loop,and achieves a relatively good result.Based on the theory of fractional frequency division,a software program is used to calculate and locate the fractional stray position.The reliability of the program is verified by combining existing data;Through program visualization,master the rule of fractional spurious distribution,and provide a theoretical basis for the phase-locked loop ping-pong switching mode.Using electromagnetic simulation software,this paper finely models the parts of the two process implementation methods that have a significant impact on signal transmission,and simulates and optimizes them to achieve the best transmission effect.Using different software for joint design and simulation,optimize the design of different modules of the circuit: the dual port output of the power divider is-3d B,and the isolation degree is above 15 dB;The output difference of the Balun differential port shall not exceed2 d B,and the isolation degree shall be above 15 d B;The return loss of the filter is below-20 d B at 3.2GHz to 5.2GHz,and the insertion loss can be below-50 d B at 6.4GHz,occupying a space of 10 mm * 8.5mm,ensuring the reliable performance of various microwave modules in the system.Select chips and use PCB method for circuit design and physical design.Write a control system.On the basis of implementing frequency hopping function,this paper adds modules such as program error detection function to meet various situations and needs as much as possible.Test each module of the system.Use an oscilloscope to test the control system,and the communication module and frequency switching module can operate normally;Using a spectrum analyzer for frequency source testing can generate frequencies ranging from3.2GHz to 5.2GHz.Finally,a miniaturized,low phase noise,low spurious,and fast frequency hopping frequency synthesis system was obtained,and the theoretically achievable functions were introduced and prospected.