1、石(shi)(shi)(shi)英鐘(zhong)(zhong)走(zou)(zou)(zou)(zou)時(shi)(shi)(shi)準、耗電(dian)(dian)(dian)省、經久耐用為(wei)其(qi)(qi)大優(you)點。不論是老式石(shi)(shi)(shi)英鐘(zhong)(zhong)或(huo)是新(xin)式多功能(neng)石(shi)(shi)(shi)英鐘(zhong)(zhong)都是以石(shi)(shi)(shi)英晶(jing)(jing)體(ti)振(zhen)(zhen)(zhen)蕩(dang)器(qi)為(wei)核(he)心(xin)電(dian)(dian)(dian)路(lu),其(qi)(qi)頻(pin)率精(jing)度(du)決(jue)定了電(dian)(dian)(dian)子鐘(zhong)(zhong)表的(de)(de)走(zou)(zou)(zou)(zou)時(shi)(shi)(shi)精(jing)度(du)。從石(shi)(shi)(shi)英晶(jing)(jing)體(ti)振(zhen)(zhen)(zhen)蕩(dang)器(qi)原理的(de)(de)示(shi)(shi)意圖(tu)中(zhong),其(qi)(qi)中(zhong)V1和V2構(gou)成(cheng)CMOS反相器(qi)石(shi)(shi)(shi)英晶(jing)(jing)體(ti)Q與振(zhen)(zhen)(zhen)蕩(dang)電(dian)(dian)(dian)容(rong)C1及(ji)微調(diao)電(dian)(dian)(dian)容(rong)C2構(gou)成(cheng)振(zhen)(zhen)(zhen)蕩(dang)系統,這里(li)石(shi)(shi)(shi)英晶(jing)(jing)體(ti)相當于電(dian)(dian)(dian)感。振(zhen)(zhen)(zhen)蕩(dang)系統的(de)(de)元件參數(shu)確定了振(zhen)(zhen)(zhen)頻(pin)率。一般Q、C1及(ji)C2均為(wei)外接(jie)(jie)元件。另外R1為(wei)反饋電(dian)(dian)(dian)阻,R2為(wei)振(zhen)(zhen)(zhen)蕩(dang)的(de)(de)穩定電(dian)(dian)(dian)阻,它(ta)們都集成(cheng)在(zai)電(dian)(dian)(dian)路(lu)內(nei)部。故無法通(tong)過(guo)改(gai)變(bian)C1或(huo)C2的(de)(de)數(shu)值來調(diao)整(zheng)走(zou)(zou)(zou)(zou)時(shi)(shi)(shi)精(jing)度(du)。但此時(shi)(shi)(shi)我們仍(reng)可用加接(jie)(jie)一只(zhi)電(dian)(dian)(dian)容(rong)C有方法,來改(gai)變(bian)振(zhen)(zhen)(zhen)蕩(dang)系統參數(shu),以調(diao)整(zheng)走(zou)(zou)(zou)(zou)時(shi)(shi)(shi)精(jing)度(du)。根據電(dian)(dian)(dian)子鐘(zhong)(zhong)表走(zou)(zou)(zou)(zou)時(shi)(shi)(shi)的(de)(de)快慢,調(diao)整(zheng)電(dian)(dian)(dian)容(rong)有兩種接(jie)(jie)法:若(ruo)走(zou)(zou)(zou)(zou)時(shi)(shi)(shi)偏快,則可在(zai)石(shi)(shi)(shi)英晶(jing)(jing)體(ti)兩端(duan)并接(jie)(jie)電(dian)(dian)(dian)容(rong)C,如(ru)圖(tu)4所(suo)示(shi)(shi)。此時(shi)(shi)(shi)系統總(zong)電(dian)(dian)(dian)容(rong)加大,振(zhen)(zhen)(zhen)蕩(dang)頻(pin)率變(bian)低(di),走(zou)(zou)(zou)(zou)時(shi)(shi)(shi)減(jian)慢。若(ruo)走(zou)(zou)(zou)(zou)時(shi)(shi)(shi)偏慢,則可在(zai)晶(jing)(jing)體(ti)支路(lu)中(zhong)串(chuan)接(jie)(jie)電(dian)(dian)(dian)容(rong)C。如(ru)圖(tu)5所(suo)示(shi)(shi)。此時(shi)(shi)(shi)系統的(de)(de)總(zong)電(dian)(dian)(dian)容(rong)減(jian)小,振(zhen)(zhen)(zhen)蕩(dang)頻(pin)率變(bian)高,走(zou)(zou)(zou)(zou)時(shi)(shi)(shi)增快。只(zhi)要經過(guo)耐心(xin)的(de)(de)反復試驗,就可以調(diao)整(zheng)走(zou)(zou)(zou)(zou)時(shi)(shi)(shi)精(jing)度(du)。因(yin)此,晶(jing)(jing)振(zhen)(zhen)(zhen)可用于時(shi)(shi)(shi)鐘(zhong)(zhong)信號發生器(qi)。
2、隨著電視(shi)技術的(de)發展,近來彩(cai)電多采用500kHz或503 kHz的(de)晶體振蕩(dang)器(qi)作為行、場電路的(de)振蕩(dang)源,經1/3的(de)分頻得到 15625Hz的(de)行頻,其穩定(ding)性和可靠性大為提高。面且晶振價格便宜,更換容易。
3、在通(tong)信系(xi)統產品中(zhong),石英晶(jing)體(ti)振蕩器的價值得(de)到了(le)更廣泛(fan)的體(ti)現,同時也得(de)到了(le)更快的發展。許多高性能的石英晶(jing)振主要(yao)應用于通(tong)信網絡、無線數據傳輸(shu)、高速(su)數字(zi)數據傳輸(shu)等。