用(yong)(yong)測(ce)(ce)(ce)電(dian)(dian)阻(zu)(zu)法(fa)判(pan)別場(chang)效(xiao)(xiao)應管(guan)的(de)(de)(de)好壞：測(ce)(ce)(ce)電(dian)(dian)阻(zu)(zu)法(fa)是用(yong)(yong)萬用(yong)(yong)表測(ce)(ce)(ce)量場(chang)效(xiao)(xiao)應管(guan)的(de)(de)(de)源(yuan)極(ji)(ji)(ji)(ji)與(yu)(yu)漏極(ji)(ji)(ji)(ji)、柵(zha)(zha)極(ji)(ji)(ji)(ji)與(yu)(yu)源(yuan)極(ji)(ji)(ji)(ji)、柵(zha)(zha)極(ji)(ji)(ji)(ji)與(yu)(yu)漏極(ji)(ji)(ji)(ji)、柵(zha)(zha)極(ji)(ji)(ji)(ji)Ｇ1與(yu)(yu)柵(zha)(zha)極(ji)(ji)(ji)(ji)Ｇ2之間(jian)的(de)(de)(de)電(dian)(dian)阻(zu)(zu)值同場(chang)效(xiao)(xiao)應管(guan)手冊標明(ming)的(de)(de)(de)電(dian)(dian)阻(zu)(zu)值是否相符去判(pan)別管(guan)的(de)(de)(de)好壞。具體方法(fa)：首(shou)先將萬用(yong)(yong)表置于(yu)Ｒ×１０或Ｒ×100檔，測(ce)(ce)(ce)量源(yuan)極(ji)(ji)(ji)(ji)Ｓ與(yu)(yu)漏極(ji)(ji)(ji)(ji)Ｄ之間(jian)的(de)(de)(de)電(dian)(dian)阻(zu)(zu)，通(tong)常(chang)(chang)在(zai)幾十歐(ou)(ou)到幾千歐(ou)(ou)范圍(wei)（在(zai)手冊中(zhong)可(ke)(ke)知，各種不同型號的(de)(de)(de)管(guan)，其(qi)電(dian)(dian)阻(zu)(zu)值是各不相同的(de)(de)(de)），如(ru)果測(ce)(ce)(ce)得(de)(de)阻(zu)(zu)值大于(yu)正(zheng)常(chang)(chang)值，可(ke)(ke)能是由(you)于(yu)內部接觸(chu)不良；如(ru)果測(ce)(ce)(ce)得(de)(de)阻(zu)(zu)值是無窮大，可(ke)(ke)能是內部斷(duan)極(ji)(ji)(ji)(ji)。然后(hou)把萬用(yong)(yong)表置于(yu)Ｒ×１０ｋ檔，再(zai)測(ce)(ce)(ce)柵(zha)(zha)極(ji)(ji)(ji)(ji)Ｇ1與(yu)(yu)Ｇ2之間(jian)、柵(zha)(zha)極(ji)(ji)(ji)(ji)與(yu)(yu)源(yuan)極(ji)(ji)(ji)(ji)、柵(zha)(zha)極(ji)(ji)(ji)(ji)與(yu)(yu)漏極(ji)(ji)(ji)(ji)之間(jian)的(de)(de)(de)電(dian)(dian)阻(zu)(zu)值，當測(ce)(ce)(ce)得(de)(de)其(qi)各項電(dian)(dian)阻(zu)(zu)值均為無窮大，則說(shuo)明(ming)管(guan)是正(zheng)常(chang)(chang)的(de)(de)(de)；若(ruo)測(ce)(ce)(ce)得(de)(de)上述各阻(zu)(zu)值太(tai)小或為通(tong)路，則說(shuo)明(ming)管(guan)是壞的(de)(de)(de)。要注(zhu)意(yi)，若(ruo)兩(liang)個(ge)柵(zha)(zha)極(ji)(ji)(ji)(ji)在(zai)管(guan)內斷(duan)極(ji)(ji)(ji)(ji)，可(ke)(ke)用(yong)(yong)元件代換法(fa)進行(xing)檢測(ce)(ce)(ce)。在(zai)振蕩器中(zhong)，場(chang)效(xiao)(xiao)應管(guan)可(ke)(ke)以(yi)用(yong)(yong)于(yu)產生高頻信號。在(zai)電(dian)(dian)壓控制器中(zhong)，FET可(ke)(ke)以(yi)用(yong)(yong)于(yu)控制電(dian)(dian)壓的(de)(de)(de)變化。臺(tai)州(zhou)耗盡型場(chang)效(xiao)(xiao)應管(guan)推薦

MOS場效(xiao)應(ying)(ying)(ying)(ying)管的(de)(de)(de)測試(shi)方式(1)．打算(suan)工(gong)(gong)作(zuo)(zuo)測量(liang)之(zhi)前，先把(ba)人體對地短路(lu)后，才能摸觸MOSFET的(de)(de)(de)管腳。在(zai)(zai)手腕上接(jie)(jie)一(yi)條導(dao)線與(yu)(yu)大(da)地連接(jie)(jie)，使人體與(yu)(yu)大(da)地維持等電(dian)(dian)位。再把(ba)管腳分離，然后拆掉導(dao)線。(2)．判斷電(dian)(dian)極(ji)(ji)將(jiang)(jiang)萬(wan)用(yong)(yong)表(biao)撥于R×100檔(dang)，首先確(que)定柵極(ji)(ji)。若某腳與(yu)(yu)其它腳的(de)(de)(de)電(dian)(dian)阻(zu)(zu)(zu)都是(shi)無(wu)限(xian)大(da)，驗(yan)證此(ci)(ci)腳就是(shi)柵極(ji)(ji)G。交(jiao)換表(biao)筆(bi)重測量(liang)，S-D之(zhi)間的(de)(de)(de)電(dian)(dian)阻(zu)(zu)(zu)值應(ying)(ying)(ying)(ying)為(wei)幾百歐(ou)至(zhi)幾千歐(ou)，其中阻(zu)(zu)(zu)值較(jiao)小的(de)(de)(de)那一(yi)次，黑表(biao)筆(bi)接(jie)(jie)的(de)(de)(de)為(wei)D極(ji)(ji)，紅表(biao)筆(bi)接(jie)(jie)的(de)(de)(de)是(shi)S極(ji)(ji)。日本生產(chan)的(de)(de)(de)3SK系列產(chan)品，S極(ji)(ji)與(yu)(yu)管殼(ke)接(jie)(jie)通，據此(ci)(ci)很容易確(que)定S極(ji)(ji)。(3)．檢驗(yan)放大(da)能力(跨導(dao))將(jiang)(jiang)G極(ji)(ji)懸空，黑表(biao)筆(bi)接(jie)(jie)D極(ji)(ji)，紅表(biao)筆(bi)接(jie)(jie)S極(ji)(ji)，然后用(yong)(yong)指(zhi)頭觸摸G極(ji)(ji)，表(biao)針(zhen)理應(ying)(ying)(ying)(ying)較(jiao)大(da)的(de)(de)(de)偏轉。雙柵MOS場效(xiao)應(ying)(ying)(ying)(ying)管有兩個柵極(ji)(ji)G1、G2。為(wei)區別之(zhi)，可用(yong)(yong)手分別觸摸G1、G2極(ji)(ji)，其中表(biao)針(zhen)向(xiang)左側(ce)偏轉大(da)幅度較(jiao)大(da)的(de)(de)(de)為(wei)G2極(ji)(ji)。目前有的(de)(de)(de)MOSFET管在(zai)(zai)G-S極(ji)(ji)間增加了保(bao)護(hu)二極(ji)(ji)管，平時就不需(xu)要把(ba)各(ge)管腳短路(lu)了。MOS場效(xiao)應(ying)(ying)(ying)(ying)晶(jing)體管在(zai)(zai)采用(yong)(yong)時應(ying)(ying)(ying)(ying)留(liu)意(yi)分類，不能隨心所欲(yu)交(jiao)換。MOS場效(xiao)應(ying)(ying)(ying)(ying)晶(jing)體管由于輸入(ru)阻(zu)(zu)(zu)抗高(包(bao)括MOS集(ji)成電(dian)(dian)路(lu))極(ji)(ji)易被靜電(dian)(dian)擊(ji)穿，用(yong)(yong)到時應(ying)(ying)(ying)(ying)留(liu)意(yi)以下準則(ze)：(1).MOS器(qi)件(jian)出廠時一(yi)般而言(yan)裝(zhuang)在(zai)(zai)黑色的(de)(de)(de)導(dao)電(dian)(dian)泡沫(mo)塑料(liao)袋(dai)(dai)中，切勿自行隨意(yi)拿個塑料(liao)袋(dai)(dai)裝(zhuang)。也可用(yong)(yong)細銅線把(ba)各(ge)個引(yin)腳聯接(jie)(jie)在(zai)(zai)一(yi)起，或用(yong)(yong)錫紙包(bao)裝(zhuang)。金華P溝耗(hao)盡型場效(xiao)應(ying)(ying)(ying)(ying)管多少錢場效(xiao)應(ying)(ying)(ying)(ying)管具有高輸入(ru)電(dian)(dian)阻(zu)(zu)(zu)、低噪聲、低功耗(hao)、寬(kuan)動態范(fan)圍、易于集(ji)成、無(wu)二次擊(ji)穿現象、安全工(gong)(gong)作(zuo)(zuo)區域寬(kuan)等優點。

根據(ju)場效(xiao)應(ying)(ying)管(guan)的(de)(de)(de)(de)(de)PN結正(zheng)、反(fan)(fan)向(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)阻(zu)值(zhi)(zhi)不一樣的(de)(de)(de)(de)(de)現(xian)象，可以(yi)判別(bie)出(chu)結型(xing)(xing)場效(xiao)應(ying)(ying)管(guan)的(de)(de)(de)(de)(de)三個(ge)(ge)電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)。具體方法：將(jiang)萬用表(biao)(biao)(biao)(biao)(biao)撥在(zai)R×1k檔(dang)上(shang)(shang)，任選兩(liang)個(ge)(ge)電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)，分(fen)別(bie)測(ce)(ce)出(chu)其正(zheng)、反(fan)(fan)向(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)阻(zu)值(zhi)(zhi)。當某(mou)兩(liang)個(ge)(ge)電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)的(de)(de)(de)(de)(de)正(zheng)、反(fan)(fan)向(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)阻(zu)值(zhi)(zhi)相(xiang)等，且為(wei)(wei)幾千歐姆時，則該兩(liang)個(ge)(ge)電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)分(fen)別(bie)是(shi)(shi)(shi)(shi)漏極(ji)(ji)(ji)(ji)D和(he)源(yuan)(yuan)極(ji)(ji)(ji)(ji)S。因為(wei)(wei)對結型(xing)(xing)場效(xiao)應(ying)(ying)管(guan)而言，漏極(ji)(ji)(ji)(ji)和(he)源(yuan)(yuan)極(ji)(ji)(ji)(ji)可互換，剩下的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)肯定(ding)是(shi)(shi)(shi)(shi)柵極(ji)(ji)(ji)(ji)Ｇ。也可以(yi)將(jiang)萬用表(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)(de)(de)黑(hei)表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)（紅(hong)表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)也行）任意接(jie)觸(chu)(chu)一個(ge)(ge)電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)，另一只(zhi)表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)依次(ci)(ci)去接(jie)觸(chu)(chu)其余的(de)(de)(de)(de)(de)兩(liang)個(ge)(ge)電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)，測(ce)(ce)其電(dian)(dian)(dian)(dian)阻(zu)值(zhi)(zhi)。當出(chu)現(xian)兩(liang)次(ci)(ci)測(ce)(ce)得的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)阻(zu)值(zhi)(zhi)近(jin)似相(xiang)等時，則黑(hei)表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)所(suo)接(jie)觸(chu)(chu)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)為(wei)(wei)柵極(ji)(ji)(ji)(ji)，其余兩(liang)電(dian)(dian)(dian)(dian)極(ji)(ji)(ji)(ji)分(fen)別(bie)為(wei)(wei)漏極(ji)(ji)(ji)(ji)和(he)源(yuan)(yuan)極(ji)(ji)(ji)(ji)。若(ruo)兩(liang)次(ci)(ci)測(ce)(ce)出(chu)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)阻(zu)值(zhi)(zhi)均很(hen)大(da)，說明是(shi)(shi)(shi)(shi)ＰＮ結的(de)(de)(de)(de)(de)反(fan)(fan)向(xiang)(xiang)(xiang)，即都是(shi)(shi)(shi)(shi)反(fan)(fan)向(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)阻(zu)，可以(yi)判定(ding)是(shi)(shi)(shi)(shi)Ｎ溝道場效(xiao)應(ying)(ying)管(guan)，且黑(hei)表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)接(jie)的(de)(de)(de)(de)(de)是(shi)(shi)(shi)(shi)柵極(ji)(ji)(ji)(ji)；若(ruo)兩(liang)次(ci)(ci)測(ce)(ce)出(chu)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)阻(zu)值(zhi)(zhi)均很(hen)小，說明是(shi)(shi)(shi)(shi)正(zheng)向(xiang)(xiang)(xiang)ＰＮ結，即是(shi)(shi)(shi)(shi)正(zheng)向(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)阻(zu)，判定(ding)為(wei)(wei)Ｐ溝道場效(xiao)應(ying)(ying)管(guan)，黑(hei)表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)接(jie)的(de)(de)(de)(de)(de)也是(shi)(shi)(shi)(shi)柵極(ji)(ji)(ji)(ji)。若(ruo)不出(chu)現(xian)上(shang)(shang)述情況(kuang)，可以(yi)調換黑(hei)、紅(hong)表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)按上(shang)(shang)述方法進行測(ce)(ce)試，直到判別(bie)出(chu)柵極(ji)(ji)(ji)(ji)為(wei)(wei)止。

如(ru)果我們(men)在上面這個圖中(zhong),將(jiang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻Rc換成一(yi)個燈(deng)泡(pao),那么當基(ji)極(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)為0時,集電(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)為0,燈(deng)泡(pao)滅.如(ru)果基(ji)極(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)比較大(da)時(大(da)于流(liu)(liu)(liu)(liu)過燈(deng)泡(pao)的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)除以三(san)極(ji)(ji)管(guan) 的(de)(de)放大(da)倍數(shu)(shu) β),三(san)極(ji)(ji)管(guan)就(jiu)飽和,相當于開關(guan)閉(bi)合,燈(deng)泡(pao)就(jiu)亮了.由于電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)只需要(yao)比燈(deng)泡(pao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)的(de)(de)β分之(zhi)一(yi)大(da)一(yi)點就(jiu)行了,所以就(jiu)可以用(yong)(yong)一(yi)個小電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)來一(yi)個大(da)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)的(de)(de)通 斷.如(ru)果基(ji)極(ji)(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)從(cong)0慢(man)慢(man)增(zeng)加,那么燈(deng)泡(pao)的(de)(de)亮度也會隨著增(zeng)加(在三(san)極(ji)(ji)管(guan)未飽和之(zhi)極(ji)(ji)管(guan)開關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)由開關(guan)三(san)極(ji)(ji)管(guan)VT，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機M，開關(guan)S，基(ji)極(ji)(ji)限流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻器R和電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源GB組成。VT采用(yong)(yong)NPN型小功率硅管(guan)8050，其集電(dian)(dian)(dian)(dian)(dian)(dian)(dian)極(ji)(ji)最(zui)大(da)允許電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)ICM可達(da)1.5A，以滿足電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機起動(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)的(de)(de)要(yao)求(qiu)。M選用(yong)(yong)工作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓為3V的(de)(de)小型直流(liu)(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)機，對應電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源GB亦為3V。場效應管(guan)的(de)(de)低(di)功耗(hao)和高(gao)頻率響(xiang)應使其在高(gao)速(su)數(shu)(shu)字電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)和無線(xian)通信(xin)系統(tong)中(zhong)得到大(da)范圍應用(yong)(yong)。

場(chang)效(xiao)應(ying)(ying)管(guan)(guan)傳統的MOS場(chang)效(xiao)應(ying)(ying)管(guan)(guan)的柵極、源(yuan)極和漏(lou)極較大(da)致處于(yu)同(tong)一水平(ping)面(mian)的芯片上(shang)，其工(gong)作電(dian)(dian)流(liu)基本上(shang)是沿水平(ping)方向流(liu)動(dong)。VMOS管(guan)(guan)則不(bu)同(tong)，其兩大(da)結(jie)構特點:點，金(jin)屬柵極采用(yong)V型(xing)(xing)槽結(jie)構；具有垂直(zhi)導電(dian)(dian)性。由(you)于(yu)漏(lou)極是從芯片的背面(mian)引出(chu)，所以ID不(bu)是沿芯片水平(ping)流(liu)動(dong)，而是自重(zhong)摻(chan)雜N+區（源(yuan)極S）出(chu)發，經過P溝道流(liu)入輕摻(chan)雜N-漂移(yi)區，垂直(zhi)向下到達漏(lou)極D。因為流(liu)通截面(mian)積增(zeng)大(da)，所以能通過大(da)電(dian)(dian)流(liu)。由(you)于(yu)在柵極與芯片之間有二氧化(hua)硅(gui)絕(jue)緣層，因此它仍屬于(yu)絕(jue)緣柵型(xing)(xing)MOS場(chang)效(xiao)應(ying)(ying)管(guan)(guan)。場(chang)效(xiao)應(ying)(ying)管(guan)(guan)有三種類(lei)型(xing)(xing)：增(zeng)強型(xing)(xing)、耗盡型(xing)(xing)和開關型(xing)(xing)。紹(shao)興(xing)結(jie)型(xing)(xing)場(chang)效(xiao)應(ying)(ying)管(guan)(guan)制造商(shang)

場(chang)效(xiao)應(ying)管可以用于電子開關和調節器件(jian)。臺州耗盡型場(chang)效(xiao)應(ying)管推薦

膩(ni)流(liu)暢的(de)(de)(de)磁性(xing)聲(sheng)，彈(dan)性(xing)十足震撼(han)人(ren)心的(de)(de)(de)低(di)頻轟炸聲(sheng)，別有一番霸道氣勢。在一般的(de)(de)(de)設計中場效(xiao)應(ying)管(guan)特(te)(te)(te)長沒有得到充分發揮，甚至認為(wei)聲(sheng)音(yin)(yin)偏冷、偏暗，其實(shi)這不(bu)是(shi)場效(xiao)應(ying)管(guan)的(de)(de)(de)原因。其聲(sheng)音(yin)(yin)不(bu)好(hao)，一方(fang)面是(shi)人(ren)們使(shi)用(yong)它直(zhi)接代換晶體管(guan)，晶體管(guan)的(de)(de)(de)線(xian)路是(shi)不(bu)能發揮出場效(xiao)應(ying)管(guan)的(de)(de)(de)特(te)(te)(te)性(xing)的(de)(de)(de)；另一方(fang)面，這些電(dian)路通常使(shi)用(yong)AB類的(de)(de)(de)偏置。根據場效(xiao)應(ying)管(guan)轉移(yi)特(te)(te)(te)性(xing)，在低(di)偏置時具(ju)有嚴重(zhong)的(de)(de)(de)非線(xian)性(xing)，帶來嚴重(zhong)的(de)(de)(de)失真，解決的(de)(de)(de)辦法(fa)是(shi)讓其工(gong)作(zuo)在A類狀態(tai)，特(te)(te)(te)別是(shi)單端(duan)A類，瞬態(tai)特(te)(te)(te)性(xing)較好(hao)，音(yin)(yin)質純美，偶次諧波豐富(fu)，音(yin)(yin)色悅耳動聽(ting)，更具(ju)有電(dian)子(zi)管(guan)的(de)(de)(de)醇美音(yin)(yin)色。臺州耗盡型場效(xiao)應(ying)管(guan)推薦

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