S-Band Nonlinear Node Detector Frequency Source Design And The Overall Scheme Comparison

Nonlinear node detector is widely used for searching and positioning active and closed electronic equipment, of which frequency source performance is largely determine the success of detector system.In the modern electronic systems,Frequency synthesizer is an important component.This thesis studies the phase-locked frequency synthesis technology based on existing Frequency synthesis technology research materials and devices,and introduces the principle of the phase lock loop phase discriminator, VCO and operational amplifier and the choice of chip. Respectively using passive loop filter and active loop filter design phase-locked loop,to provide s-band nonlinear node detector with the vibration signal.The first chapter briefly describes the development and application of s-band nonlinear node detector, frequency synthesis technology research status at home and abroad, describes the research significance and the specific content of this thesis.Second chapter introduced the basic theory of s-band nonlinear detector, basic knowledge of the frequency source, then giving this topic system overall scheme, the frequency part of block diagram and source design.The third chapter in this topic of devices used in the basic theory knowledge,selection and test results, including phase discriminator, VCO, operational amplifier and crystal oscillator.The fourth chapter presents the basic theory of frequency source loop filter, and this topic chooses the loop filter types, including the fourth order passive loop filter and fourth-order active loop filter, and carries on the simulation design and verification, the results meet the requirements of this subject.Fifth chapter probes frequency source design, test and result analysis, including PCB layers transition designs, standing wave ratio is less than 2, satisfies the requirement of a transmission line. Output frequency 500 MHZ frequency source validation board designs and frequency source link designs, overall design is complete and the processing test.Chapter 6 summarizes the work of the whole thesis, and summarizes the shortcomings.In a word, the completion of this thesis provides some experience and lessons to the design of phase-locked loop research.