使用溫補振蕩器(qi)的注(zhu)意事(shi)項

溫補晶體振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)(dang)器(qi)(qi)(qi)，包括基(ji)板，所(suo)述基(ji)板的(de)(de)(de)上(shang)側(ce)(ce)(ce)設(she)(she)(she)置有(you)(you)外(wai)(wai)殼，所(suo)述外(wai)(wai)殼的(de)(de)(de)上(shang)側(ce)(ce)(ce)設(she)(she)(she)置有(you)(you)封裝(zhuang)蓋，所(suo)述外(wai)(wai)殼的(de)(de)(de)內側(ce)(ce)(ce)開設(she)(she)(she)有(you)(you)芯片(pian)(pian)(pian)安裝(zhuang)腔，所(suo)述芯片(pian)(pian)(pian)安裝(zhuang)腔的(de)(de)(de)內側(ce)(ce)(ce)設(she)(she)(she)置有(you)(you)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)(dang)電路芯片(pian)(pian)(pian)，所(suo)述芯片(pian)(pian)(pian)安裝(zhuang)腔的(de)(de)(de)上(shang)側(ce)(ce)(ce)開設(she)(she)(she)有(you)(you)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)(dang)安裝(zhuang)腔，所(suo)述振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)(dang)安裝(zhuang)腔的(de)(de)(de)內側(ce)(ce)(ce)設(she)(she)(she)置有(you)(you)石英振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)(dang)片(pian)(pian)(pian)，所(suo)述外(wai)(wai)殼的(de)(de)(de)外(wai)(wai)表(biao)面設(she)(she)(she)置有(you)(you)散(san)(san)熱(re)片(pian)(pian)(pian);通(tong)過設(she)(she)(she)計在振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)(dang)器(qi)(qi)(qi)外(wai)(wai)殼上(shang)的(de)(de)(de)散(san)(san)熱(re)片(pian)(pian)(pian)，在使(shi)用時可以(yi)通(tong)過散(san)(san)熱(re)片(pian)(pian)(pian)加(jia)快振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)(dang)器(qi)(qi)(qi)產生的(de)(de)(de)熱(re)量(liang)，減少熱(re)量(liang)對振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)(dang)器(qi)(qi)(qi)的(de)(de)(de)影響，且在運輸時振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)(dang)器(qi)(qi)(qi)可以(yi)通(tong)過振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)(dang)器(qi)(qi)(qi)外(wai)(wai)殼兩端交錯設(she)(she)(she)置的(de)(de)(de)散(san)(san)熱(re)片(pian)(pian)(pian)相互卡合，使(shi)振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)(dang)器(qi)(qi)(qi)碼放(fang)更加(jia)穩定(ding)，防(fang)止因為(wei)晃動導致振(zhen)(zhen)(zhen)蕩(dang)(dang)(dang)(dang)器(qi)(qi)(qi)撞擊出現(xian)損壞.

晶體振(zhen)蕩器頻率控制(zhi)方法

振蕩器可(ke)(ke)通(tong)過(guo)直(zhi)接(jie)(jie)牽(qian)(qian)(qian)引(yin)頻(pin)率(lv)或使用高分辨率(lv)鎖相(xiang)(xiang)環調整頻(pin)率(lv)來實(shi)現(xian)頻(pin)率(lv)控(kong)(kong)制(zhi)。直(zhi)接(jie)(jie)牽(qian)(qian)(qian)引(yin)頻(pin)率(lv)的(de)(de) VCXO用調整變(bian)容(rong)二極管電(dian)壓來改(gai)變(bian)諧振電(dian)路電(dian)容(rong)，而直(zhi)接(jie)(jie)牽(qian)(qian)(qian)引(yin)頻(pin)率(lv)的(de)(de)DCXO通(tong)過(guo)可(ke)(ke)編程開關(guan)切換不同的(de)(de)諧振電(dian)容(rong)。使用石英晶體諧振器的(de)(de)VCXO直(zhi)接(jie)(jie)牽(qian)(qian)(qian)引(yin)頻(pin) 率(lv)調整可(ke)(ke)以保持低相(xiang)(xiang)位噪(zao)聲，但(dan)牽(qian)(qian)(qian)引(yin)范(fan)(fan)圍(wei)(wei)被(bei)限制(zhi)在約±200ppm。當系統應(ying)用需要更寬的(de)(de)頻(pin)率(lv)牽(qian)(qian)(qian)引(yin)范(fan)(fan)圍(wei)(wei)和與(yu)晶體振蕩器相(xiang)(xiang)近的(de)(de)低噪(zao)聲特性時，用戶更傾向(xiang)于(yu)(yu)選擇(ze) 基于(yu)(yu)鎖相(xiang)(xiang)環的(de)(de)MEMS控(kong)(kong)制(zhi)振蕩器架(jia)構，因為它(ta)們可(ke)(ke)以提供(gong)高達±1600ppm的(de)(de)牽(qian)(qian)(qian)引(yin)范(fan)(fan)圍(wei)(wei)。

溫補振蕩器(qi)工(gong)作(zuo)的原理

首先了(le)解晶(jing)體的(de)數(shu)學(xue)模型(xing)，用負(fu)阻的(de)方(fang)法分析(xi)了(le)石(shi)英晶(jing)體振(zhen)蕩(dang)(dang)器(qi)(qi)(qi)的(de)起振(zhen)原(yuan)理以及補(bu)(bu)償方(fang)法，設(she)(she)計了(le)數(shu)字(zi)電(dian)(dian)(dian)(dian)(dian)容陣列可(ke)調(diao)頻(pin)率晶(jing)體振(zhen)蕩(dang)(dang)電(dian)(dian)(dian)(dian)(dian)路(lu)，溫(wen)(wen)(wen)補(bu)(bu)振(zhen)蕩(dang)(dang)器(qi)(qi)(qi)報(bao)價(jia)，實(shi)現(xian)了(le)頻(pin)率簡(jian)(jian)單可(ke)控(kong).帶隙測溫(wen)(wen)(wen)電(dian)(dian)(dian)(dian)(dian)路(lu)采用了(le)LDO供電(dian)(dian)(dian)(dian)(dian)和cascode結(jie)構，溫(wen)(wen)(wen)補(bu)(bu)振(zhen)蕩(dang)(dang)器(qi)(qi)(qi)生產廠(chang)家，實(shi)現(xian)了(le)輸(shu)出溫(wen)(wen)(wen)度電(dian)(dian)(dian)(dian)(dian)壓具有高抑制比和準確性(xing).模數(shu)轉換器(qi)(qi)(qi)ADC采用了(le)12位逐(zhu)次(ci)逼近型(xing)電(dian)(dian)(dian)(dian)(dian)路(lu)，溫(wen)(wen)(wen)補(bu)(bu)振(zhen)蕩(dang)(dang)器(qi)(qi)(qi)，結(jie)構簡(jian)(jian)單精度適中.LDO為(wei)測溫(wen)(wen)(wen)電(dian)(dian)(dian)(dian)(dian)路(lu)提(ti)供了(le)穩定(ding)(ding)的(de)工作電(dian)(dian)(dian)(dian)(dian)源保證(zheng)了(le)輸(shu)出信號的(de)穩定(ding)(ding)，溫(wen)(wen)(wen)補(bu)(bu)振(zhen)蕩(dang)(dang)器(qi)(qi)(qi)價(jia)格，通過間斷(duan)性(xing)地工作實(shi)現(xian)整個系(xi)統(tong)的(de)低功(gong)耗. 隨著CMOS技術的(de)發展，上述的(de)各種(zhong)電(dian)(dian)(dian)(dian)(dian)路(lu)都(dou)可(ke)以集成在(zai)一塊芯片里面.本文基于集成電(dian)(dian)(dian)(dian)(dian)路(lu)設(she)(she)計工具Cadence的(de)軟件環境，和SMIC的(de)0.35um工藝，設(she)(she)計了(le)以上電(dian)(dian)(dian)(dian)(dian)路(lu)，并得到(dao)了(le)結(jie)果，驗證(zheng)了(le)本設(she)(she)計的(de)可(ke)行性(xing).