晶振的作用

晶(jing)振(zhen)(zhen)也是控制CPU的(de)時鐘頻(pin)(pin)(pin)率(lv)的(de)，也就是產(chan)生(sheng)高(gao)低電(dian)(dian)平的(de)周(zhou)期(qi)(產(chan)生(sheng)一(yi)個高(gao)電(dian)(dian)平，和一(yi)個低電(dian)(dian)平為一(yi)個周(zhou)期(qi)，)一(yi)般說來次頻(pin)(pin)(pin)率(lv)越高(gao)，電(dian)(dian)腦(nao)在單位時間里處理(li)的(de)速(su)度越快晶(jing)振(zhen)(zhen)本身并不產(chan)生(sheng)振(zhen)(zhen)蕩(dang)，但它會以一(yi)個固(gu)(gu)定(ding)的(de)頻(pin)(pin)(pin)率(lv)與外電(dian)(dian)路(lu)(lu)(lu)發(fa)生(sheng)諧振(zhen)(zhen)，前(qian)提是外電(dian)(dian)路(lu)(lu)(lu)的(de)振(zhen)(zhen)蕩(dang)頻(pin)(pin)(pin)率(lv)必須與晶(jing)振(zhen)(zhen)的(de)固(gu)(gu)有(you)(you)振(zhen)(zhen)蕩(dang)頻(pin)(pin)(pin)率(lv)相一(yi)致，起碼(ma)也要非常(chang)接近，否(fou)則電(dian)(dian)路(lu)(lu)(lu)將(jiang)停振(zhen)(zhen)。關于測試，一(yi)般業余情況下用(yong)萬用(yong)表(biao)測有(you)(you)電(dian)(dian)阻（指(zhi)表(biao)針(zhen)動(dong)）則已損壞（振(zhen)(zhen)蕩(dang)頻(pin)(pin)(pin)率(lv)很低的(de)表(biao)針(zhen)也會略擺，但馬上歸零），表(biao)針(zhen)不動(dong)（電(dian)(dian)阻無窮大），有(you)(you)可(ke)能好，有(you)(you)可(ke)能引線開路(lu)(lu)(lu)。

晶體振蕩器的選用

晶(jing)(jing)(jing)體(ti)振(zhen)(zhen)(zhen)(zhen)蕩(dang)器(qi)(qi)被廣泛應用(yong)(yong)(yong)(yong)到軍、民用(yong)(yong)(yong)(yong)通信(xin)電(dian)(dian)(dian)臺(tai)，微波通信(xin)設(she)備(bei)，程(cheng)(cheng)控電(dian)(dian)(dian)話交(jiao)換機，無線電(dian)(dian)(dian)綜合(he)測試(shi)儀，BP機、移動(dong)電(dian)(dian)(dian)話發射(she)臺(tai)，頻(pin)率計數(shu)(shu)器(qi)(qi)、GPS、遙控移動(dong)設(she)備(bei)等。它有(you)多種(zhong)(zhong)(zhong)封裝，特(te)點是(shi)電(dian)(dian)(dian)氣(qi)性能規(gui)范多種(zhong)(zhong)(zhong)多樣。它有(you)好幾種(zhong)(zhong)(zhong)不(bu)同的(de)(de)(de)(de)(de)類型：電(dian)(dian)(dian)壓控制晶(jing)(jing)(jing)體(ti)振(zhen)(zhen)(zhen)(zhen)蕩(dang)器(qi)(qi)（VCXO）、溫度(du)(du)(du)補(bu)(bu)償(chang)晶(jing)(jing)(jing)體(ti)振(zhen)(zhen)(zhen)(zhen)蕩(dang)器(qi)(qi)（TCXO）、恒(heng)溫晶(jing)(jing)(jing)體(ti)振(zhen)(zhen)(zhen)(zhen)蕩(dang)器(qi)(qi)（OCXO），差(cha)(cha)分(fen)輸出(chu)(chu)(chu)晶(jing)(jing)(jing)振(zhen)(zhen)(zhen)(zhen)價格，以及數(shu)(shu)字補(bu)(bu)償(chang)晶(jing)(jing)(jing)體(ti)振(zhen)(zhen)(zhen)(zhen)蕩(dang)器(qi)(qi)（MCXO或DTCXO），每(mei)種(zhong)(zhong)(zhong)類型都有(you)自(zi)己的(de)(de)(de)(de)(de)性能。如果需要使(shi)設(she)備(bei)即開即用(yong)(yong)(yong)(yong)，您就必須(xu)選用(yong)(yong)(yong)(yong)VCXO或溫補(bu)(bu)晶(jing)(jing)(jing)振(zhen)(zhen)(zhen)(zhen)，如果要求(qiu)穩(wen)(wen)定(ding)度(du)(du)(du)在(zai)(zai)(zai)0.5ppm以上(shang)(shang)(shang)，則需選擇數(shu)(shu)字溫補(bu)(bu)晶(jing)(jing)(jing)振(zhen)(zhen)(zhen)(zhen)（MCXO）。模擬溫補(bu)(bu)晶(jing)(jing)(jing)振(zhen)(zhen)(zhen)(zhen)適用(yong)(yong)(yong)(yong)于穩(wen)(wen)定(ding)度(du)(du)(du)要求(qiu)在(zai)(zai)(zai)5ppm～0.5ppm之(zhi)間的(de)(de)(de)(de)(de)需求(qiu)。VCXO只適合(he)于穩(wen)(wen)定(ding)度(du)(du)(du)要求(qiu)在(zai)(zai)(zai)5ppm以下的(de)(de)(de)(de)(de)產品(pin)(pin)。在(zai)(zai)(zai)不(bu)需要即開即用(yong)(yong)(yong)(yong)的(de)(de)(de)(de)(de)環境下，如果需要信(xin)號穩(wen)(wen)定(ding)度(du)(du)(du)超過(guo)0.1ppm的(de)(de)(de)(de)(de)，可選用(yong)(yong)(yong)(yong)OCXO。 晶(jing)(jing)(jing)體(ti)振(zhen)(zhen)(zhen)(zhen)蕩(dang)器(qi)(qi)的(de)(de)(de)(de)(de)主要特(te)性之(zhi)一是(shi)工作溫度(du)(du)(du)內的(de)(de)(de)(de)(de)穩(wen)(wen)定(ding)性，它是(shi)決定(ding)振(zhen)(zhen)(zhen)(zhen)蕩(dang)器(qi)(qi)價格的(de)(de)(de)(de)(de)重要因素。穩(wen)(wen)定(ding)性愈高(gao)或溫度(du)(du)(du)范圍愈寬，器(qi)(qi)件的(de)(de)(de)(de)(de)價格亦(yi)愈高(gao)。工業級標準規(gui)定(ding)的(de)(de)(de)(de)(de)-40～+75℃這個范圍往(wang)往(wang)只是(shi)出(chu)(chu)(chu)于設(she)計者(zhe)們的(de)(de)(de)(de)(de)習慣，倘若(ruo)-30～+70℃已(yi)經夠用(yong)(yong)(yong)(yong)，那么就不(bu)必去追求(qiu)更寬的(de)(de)(de)(de)(de)溫度(du)(du)(du)范圍。設(she)計工程(cheng)(cheng)師要慎密(mi)決定(ding)特(te)定(ding)應用(yong)(yong)(yong)(yong)的(de)(de)(de)(de)(de)實際需要，然后規(gui)定(ding)振(zhen)(zhen)(zhen)(zhen)蕩(dang)器(qi)(qi)的(de)(de)(de)(de)(de)穩(wen)(wen)定(ding)度(du)(du)(du)。指標過(guo)高(gao)意味著花(hua)錢愈多。晶(jing)(jing)(jing)體(ti)老化(hua)是(shi)造成頻(pin)率變(bian)化(hua)的(de)(de)(de)(de)(de)又一重要因素。根據目(mu)標產品(pin)(pin)的(de)(de)(de)(de)(de)預期壽命不(bu)同，有(you)多種(zhong)(zhong)(zhong)方法可以減弱這種(zhong)(zhong)(zhong)影響。晶(jing)(jing)(jing)體(ti)老化(hua)會使(shi)輸出(chu)(chu)(chu)頻(pin)率按(an)照對(dui)數(shu)(shu)曲(qu)線發生變(bian)化(hua)，也(ye)就是(shi)說在(zai)(zai)(zai)產品(pin)(pin)使(shi)用(yong)(yong)(yong)(yong)的(de)(de)(de)(de)(de)一年，這種(zhong)(zhong)(zhong)現象才較為顯著。例如，使(shi)用(yong)(yong)(yong)(yong)10年以上(shang)(shang)(shang)的(de)(de)(de)(de)(de)晶(jing)(jing)(jing)體(ti)，其(qi)老化(hua)速度(du)(du)(du)大(da)約是(shi)一年的(de)(de)(de)(de)(de)3倍。采用(yong)(yong)(yong)(yong)特(te)殊的(de)(de)(de)(de)(de)晶(jing)(jing)(jing)體(ti)加工工藝可以改善這種(zhong)(zhong)(zhong)情況(kuang)，差(cha)(cha)分(fen)輸出(chu)(chu)(chu)晶(jing)(jing)(jing)振(zhen)(zhen)(zhen)(zhen)原廠，也(ye)可以采用(yong)(yong)(yong)(yong)調節的(de)(de)(de)(de)(de)辦(ban)法解決，比(bi)如，差(cha)(cha)分(fen)輸出(chu)(chu)(chu)晶(jing)(jing)(jing)振(zhen)(zhen)(zhen)(zhen)，可以在(zai)(zai)(zai)控制引(yin)腳上(shang)(shang)(shang)施(shi)加電(dian)(dian)(dian)壓（即增加電(dian)(dian)(dian)壓控制功能）等。

晶體振蕩器

通用(yong)(yong)(yong)晶體振(zhen)蕩(dang)(dang)(dang)器(qi)(qi)，用(yong)(yong)(yong)于(yu)各種電路中，產(chan)生振(zhen)蕩(dang)(dang)(dang)頻率。時鐘(zhong)脈(mo)沖用(yong)(yong)(yong)石(shi)(shi)(shi)英(ying)晶體諧振(zhen)器(qi)(qi)，與其它元件(jian)配合產(chan)生標準脈(mo)沖信號，廣泛用(yong)(yong)(yong)于(yu)數字電路中。微處理器(qi)(qi)用(yong)(yong)(yong)石(shi)(shi)(shi)英(ying)晶體諧振(zhen)器(qi)(qi)，鐘(zhong)表用(yong)(yong)(yong)石(shi)(shi)(shi)英(ying)晶體振(zhen)蕩(dang)(dang)(dang)器(qi)(qi)，北京晶宇興(xing)擁有自主生產(chan)基地可(ke)以(yi)為您提供(gong)國產(chan)的(de)，可(ke)替代進(jin)口的(de)，各類溫(wen)度(du)等(deng)級的(de)晶振(zhen)，差分輸出(chu)晶振(zhen)報價，溫(wen)度(du)可(ke)高(gao)(gao)達175度(du)，適(shi)用(yong)(yong)(yong)于(yu)石(shi)(shi)(shi)油行業及軍*行業等(deng)惡略環境下(xia)使用(yong)(yong)(yong)，如(ru)有需要高(gao)(gao)溫(wen)晶振(zhen)的(de)用(yong)(yong)(yong)戶，歡迎來電咨詢，我(wo)們(men)公司有的(de)技術人員(yuan)，可(ke)以(yi)為您提供(gong)周到的(de)服(fu)務。