溫補振蕩器應用

溫(wen)補振(zhen)蕩器(TCXO)是利用(yong)附件的溫(wen)度補償電路以減少環境(jing)溫(wen)度對(dui)振(zhen)蕩頻(pin)(pin)率的影響。TCXO利用(yong)熱敏電阻的溫(wen)度敏感性，當溫(wen)度變化(hua)時(shi)，熱敏電阻的阻值(zhi)和容性負載(zai)同時(shi)發生變化(hua)，而容性負載(zai)的變化(hua)會改(gai)變振(zhen)蕩頻(pin)(pin)率，從而實現的對(dui)振(zhen)蕩頻(pin)(pin)率的修正。頻(pin)(pin)率精度和溫(wen)度特性遠高于(yu)普(pu)通(tong)振(zhen)蕩器，溫(wen)補有源晶(jing)振(zhen)生產(chan)廠(chang)家，比恒溫(wen)晶(jing)振(zhen)差，但不需預熱，功耗低，從而在野外(wai)作業(ye)，移動設(she)備，通(tong)訊導航(hang)設(she)備中廣(guang)泛應用(yong)。

溫補振蕩器中直(zhi)接補償(chang)類(lei)型

直(zhi)接補(bu)(bu)(bu)償(chang)型(xing) 直(zhi)接補(bu)(bu)(bu)償(chang)型(xing)TCXO是由熱敏電(dian)(dian)阻(zu)和(he)阻(zu)容元件組成(cheng)的溫(wen)度(du)補(bu)(bu)(bu)償(chang)電(dian)(dian)路，在振蕩器中與石英水晶(jing)(jing)振子串聯而(er)成(cheng)的。在溫(wen)度(du)變(bian)化(hua)時，熱敏電(dian)(dian)阻(zu)的阻(zu)值和(he)晶(jing)(jing)體(ti)(ti)等效串聯電(dian)(dian)容容值相應(ying)變(bian)化(hua)，從而(er)抵消或(huo)削減振蕩頻率的溫(wen)度(du)漂移。該補(bu)(bu)(bu)償(chang)方(fang)式電(dian)(dian)路簡單，成(cheng)本較低(di)，溫(wen)補(bu)(bu)(bu)有源(yuan)晶(jing)(jing)振，節省(sheng)印(yin)制(zhi)電(dian)(dian)路板(ban)(PCB)尺寸和(he)空間，溫(wen)補(bu)(bu)(bu)有源(yuan)晶(jing)(jing)振廠家，適(shi)用(yong)于(yu)小型(xing)和(he)低(di)壓(ya)小電(dian)(dian)流場(chang)合。但當要(yao)求晶(jing)(jing)體(ti)(ti)振蕩器精度(du)小于(yu)±1pmm時，直(zhi)接補(bu)(bu)(bu)償(chang)方(fang)式并不適(shi)宜。

溫補振蕩器組成

溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)補(bu)(bu)償(chang)晶體振(zhen)(zhen)(zhen)蕩(dang)器(qi)(qi)(qi)的(de)(de)溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)-電(dian)壓(ya)補(bu)(bu)償(chang)碼特性曲線測試(shi)(shi)系(xi)統(tong)，給出了測試(shi)(shi)系(xi)統(tong)的(de)(de)總體設(she)(she)計(ji)(ji)方案(an)，測試(shi)(shi)服務器(qi)(qi)(qi)的(de)(de)軟硬件(jian)設(she)(she)計(ji)(ji)方法和基于事件(jian)驅動(dong)的(de)(de)計(ji)(ji)算機(ji)測試(shi)(shi)軟件(jian)模型.測試(shi)(shi)系(xi)統(tong)由(you)計(ji)(ji)算機(ji)，測試(shi)(shi)服務器(qi)(qi)(qi)，高低溫(wen)(wen)(wen)(wen)(wen)試(shi)(shi)驗(yan)箱(xiang)和高精度(du)(du)(du)(du)(du)數(shu)(shu)(shu)(shu)字頻率(lv)計(ji)(ji)等(deng)組成，由(you)人工方式設(she)(she)置溫(wen)(wen)(wen)(wen)(wen)箱(xiang)溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)，恒(heng)溫(wen)(wen)(wen)(wen)(wen)時(shi)間，溫(wen)(wen)(wen)(wen)(wen)補(bu)(bu)有源晶振(zhen)(zhen)(zhen)報價(jia)，采用(yong)人工或自(zi)動(dong)方式選擇待測數(shu)(shu)(shu)(shu)字溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)補(bu)(bu)償(chang)振(zhen)(zhen)(zhen)蕩(dang)器(qi)(qi)(qi)試(shi)(shi)件(jian)，提取待測數(shu)(shu)(shu)(shu)字溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)補(bu)(bu)償(chang)振(zhen)(zhen)(zhen)蕩(dang)器(qi)(qi)(qi)的(de)(de)溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)碼和按溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)頻率(lv)穩(wen)定度(du)(du)(du)(du)(du)設(she)(she)定補(bu)(bu)償(chang)電(dian)壓(ya)碼，自(zi)動(dong)生成數(shu)(shu)(shu)(shu)字溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)補(bu)(bu)償(chang)電(dian)路所需的(de)(de)Intel-HEX格式的(de)(de)單片機(ji)機(ji)器(qi)(qi)(qi)碼文件(jian).實(shi)驗(yan)結果表明(ming)，設(she)(she)計(ji)(ji)的(de)(de)測試(shi)(shi)系(xi)統(tong)能夠滿足高精度(du)(du)(du)(du)(du)數(shu)(shu)(shu)(shu)字溫(wen)(wen)(wen)(wen)(wen)度(du)(du)(du)(du)(du)補(bu)(bu)償(chang)振(zhen)(zhen)(zhen)蕩(dang)器(qi)(qi)(qi)批量生產(chan)的(de)(de)需要.