選擇旁路電(dian)容器(qi)時要考慮的關鍵參數(shu)包括交流信號的最(zui)低頻率和電(dian)阻器(qi)的阻值。在大多數(shu)情況下，最(zui)低頻率為 50 Hz。

盡(jin)管不同(tong)類型的(de)電(dian)(dian)容(rong)器(qi)可(ke)用于去(qu)(qu)耦/旁路應(ying)(ying)用，但它們(men)的(de)特性(xing)會根據(ju)所使用的(de)介電(dian)(dian)材料和結構而有顯(xian)著差(cha)異。兩者決定(ding)了(le)溫度(du)穩定(ding)性(xing)、線性(xing)度(du)、額定(ding)電(dian)(dian)壓、物理(li)尺寸和成本。通(tong)常用于去(qu)(qu)耦應(ying)(ying)用的(de)電(dian)(dian)容(rong)器(qi)類型包括陶瓷、鉭和鋁(lv)電(dian)(dian)解電(dian)(dian)容(rong)器(qi)。

陶(tao)瓷(ci)電(dian)容(rong)(rong)器(qi)的性能(neng)和成(cheng)本(ben)使其成(cheng)為去耦應用的流行選擇(ze)(ze)。這些(xie)電(dian)容(rong)(rong)器(qi)具有低等(deng)效(xiao)串聯(lian)電(dian)阻 (ESR) 和等(deng)效(xiao)串聯(lian)電(dian)感 (ESL)。此(ci)外，多層陶(tao)瓷(ci)電(dian)容(rong)(rong)器(qi) (MLCC) 具有多種封裝和電(dian)容(rong)(rong)值(zhi)。陶(tao)瓷(ci)電(dian)容(rong)(rong)器(qi)是高(gao)頻電(dian)路(lu)去耦應用的絕佳選擇(ze)(ze)。

開(kai)關型鋁電(dian)(dian)解電(dian)(dian)容(rong)(rong)器(qi)通常用于(yu)低(di)頻和中頻電(dian)(dian)子電(dian)(dian)路中的去耦應用。這些電(dian)(dian)容(rong)(rong)器(qi)價格(ge)低(di)廉，電(dian)(dian)容(rong)(rong)值范圍廣(guang)(guang)，電(dian)(dian)容(rong)(rong)體(ti)積(ji)比高。然(ran)而，鋁電(dian)(dian)解電(dian)(dian)容(rong)(rong)器(qi)表現出與溫度相關的磨損，并(bing)且在低(di)溫下具有(you)高 ESR。這些電(dian)(dian)容(rong)(rong)器(qi)廣(guang)(guang)泛用于(yu)消費(fei)產品的去耦應用。

固態鉭(tan)電(dian)容(rong)(rong)器(qi)具(ju)有高(gao) CV，不(bu)易(yi)磨損。此(ci)外，它(ta)們在(zai)低(di)溫下(xia)表現出令人印象(xiang)深刻的穩定性(xing)。與鋁電(dian)解電(dian)容(rong)(rong)器(qi)相比(bi)，鉭(tan)電(dian)容(rong)(rong)器(qi)具(ju)有更(geng)高(gao)的電(dian)容(rong)(rong)體積比(bi)和更(geng)低(di)的 ESR。另(ling)一方面，鉭(tan)電(dian)容(rong)(rong)器(qi)價格昂貴且僅限于低(di)電(dian)壓應(ying)用，通常高(gao)達 50 V。這些電(dian)容(rong)(rong)器(qi)通常用于可靠性(xing)更(geng)高(gao)的應(ying)用。

聚酯、聚丙烯、特(te)氟隆(long)和聚苯乙(yi)烯電(dian)容(rong)器(qi)等薄膜電(dian)容(rong)器(qi)的去耦(ou)(ou)應(ying)用(yong)有限。雖然(ran)這些電(dian)容(rong)器(qi)適用(yong)于高壓應(ying)用(yong)并且不易磨損(sun)，但(dan)生產(chan)它(ta)們(men)的成本相(xiang)對較高。然(ran)而，這些電(dian)容(rong)器(qi)的特(te)性使其(qi)成為(wei)高電(dian)壓、高電(dian)流和音頻去耦(ou)(ou)應(ying)用(yong)的合適選擇。

電(dian)(dian)(dian)容(rong)器(qi)是模擬和數字電(dian)(dian)(dian)子電(dian)(dian)(dian)路中的基本元(yuan)件。它們用(yong)于廣泛的應用(yong)，包括耦(ou)合、去耦(ou)、濾波和定時應用(yong)。耦(ou)合電(dian)(dian)(dian)容(rong)器(qi)允許交流(liu)(liu)分量通(tong)過，同時阻止(zhi)直流(liu)(liu)分量。去耦(ou)電(dian)(dian)(dian)容(rong)器(qi)在電(dian)(dian)(dian)子電(dian)(dian)(dian)路中用(yong)作(zuo)儲(chu)能(neng)器(qi)，以防止(zhi)電(dian)(dian)(dian)壓快速變化(hua)。旁路電(dian)(dian)(dian)容(rong)器(qi)通(tong)過將不需要的交流(liu)(liu)分量分流(liu)(liu)到(dao)地來清潔直流(liu)(liu)信號。電(dian)(dian)(dian)容(rong)器(qi)在很大程度上決定了電(dian)(dian)(dian)子電(dian)(dian)(dian)路的性能(neng)、壽命和可靠性。