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1、FB代表什么电子器件（WhatelectronicdevicesdoesFBstandfor）Magneticbeads。MarkedwithFBshouldbemagneticbeads!Whatismagneticbeads?Magneticbeadshaveveryhighresistivityandpermeability.Theyareequivalenttoseriesofresistorsandinductors,buttheresistanceandinductancevarywithfrequency.Comparedwiththeconvent
2、ionalinductor,thefilterhasbetterhigh-frequencyfilteringproperty,andhashighresistanceathighfrequency,sotheimpedancecanbemaintainedinarelativelywidefrequencyrange,therebyimprovingthefrequencymodulationfilteringeffect.Inductorscanbeusedaspowerfilters.Magneticbeadcircuitsymbolisinductance
3、,butthemodelcanbeseenontheuseofmagneticbeads,incircuitfunction,magneticbeadsandinductorsarethesameprinciple,butthefrequencycharacteristicsofdifferentbaleThemagneticbeadiscomposedofanoxygenmagnet,andtheinductanceiscomposedofamagneticcoreandacoil,whereinthemagneticbeadtransformstheACsig
4、nalintoheatenergy,andtheinductorstorestheACandreleasesitslowly.Magneticbeadshaveagreatinfluenceonhighfrequencysignals.Thegeneralspecificationsare100euro/100mMHZ,whichismuchsmallerthaninductanceatlowfrequencies.Ferritemagneticbead(FerriteBead)isakindofanti-interferencecomponentthatisde
5、velopingveryfastatpresent.Itischeapandeasytouse,andtheeffectofremovinghighfrequencynoiseisremarkable.Inacircuit,aslongasthewirepassesthroughit(Iusearesistorlikepattern,thewirehaspassedandcemented,andthereisasurfacemount,butrarelyseen).Whenthecurrentinthewirepassesthrough,theferritehas
6、almostnoimpedancetothelowfrequencycurrent,whilethehigherfrequencyofthecurrentwillhaveagreaterattenuation.Thehighfrequencycurrentisdistributedintheformofheat,theequivalentcircuitisaninductanceandaresistorinseries,andthevaluesofthetwocomponentsareproportionaltothelengthofthemagneticbead
7、s.Therearemanykindsofmagneticbeads,andmanufacturersshouldprovidetechnicalspecifications,especiallythecurvesoftherelationshipbetweenthefrequencyandtheimpedanceofmagneticbeads.Apluralityofholesorbeads,withwirethroughincreasethecomponentimpedance(throughtimessquare,beads)buttheincreasein
8、theab
