電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器的噪(zao)(zao)聲(sheng)(sheng)電(dian)(dian)(dian)(dian)動(dong)勢(shi)在(zai)一般電(dian)(dian)(dian)(dian)路中可不(bu)予考慮但在(zai)弱信號系統中則(ze)不(bu)可忽視。電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器的噪(zao)(zao)聲(sheng)(sheng)電(dian)(dian)(dian)(dian)動(dong)勢(shi)是由熱噪(zao)(zao)聲(sheng)(sheng)和電(dian)(dian)(dian)(dian)流(liu)噪(zao)(zao)聲(sheng)(sheng)兩部分組成的。線(xian)繞電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器的噪(zao)(zao)聲(sheng)(sheng)只限于(yu)熱噪(zao)(zao)聲(sheng)(sheng)，而(er)薄膜電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器除(chu)了(le)熱噪(zao)(zao)聲(sheng)(sheng)外，還有電(dian)(dian)(dian)(dian)流(liu)噪(zao)(zao)聲(sheng)(sheng)，這是因為在(zai)外加電(dian)(dian)(dian)(dian)壓的作用下，導(dao)體微粒間產生不(bu)規則(ze)的振動(dong)，使電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)值產生起(qi)(qi)伏變(bian)化，從(cong)而(er)對流(liu)過電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器的電(dian)(dian)(dian)(dian)流(liu)起(qi)(qi)到了(le)調制作用。

通(tong)常金屬膜(mo)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器(qi)、碳膜(mo)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器(qi)和線繞電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器(qi)的(de)(de)噪聲(sheng)(sheng)及噪聲(sheng)(sheng)電(dian)(dian)(dian)(dian)動勢較小，而合(he)成膜(mo)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器(qi)和實芯(xin)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器(qi)的(de)(de)噪聲(sheng)(sheng)及噪聲(sheng)(sheng)電(dian)(dian)(dian)(dian)動勢要(yao)高得多(duo)。對于(yu)接收電(dian)(dian)(dian)(dian)路的(de)(de)高放(fang)級和高增(zeng)益(yi)的(de)(de)前置放(fang)大(da)級以選用金屬膜(mo)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器(qi)、碳膜(mo)電(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)器(qi)為好。

文章源自：電阻，旺詮合金電阻、旺(wang)詮合金電(dian)阻代(dai)理商