開(kai)關電(dian)源模塊阻(zu)(zu)(zu)(zu)抗(kang)(kang)是指內部電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)、電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容和電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)組成的電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)對(dui)交(jiao)(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)起到(dao)阻(zu)(zu)(zu)(zu)礙(ai)(ai)作用。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)的阻(zu)(zu)(zu)(zu)抗(kang)(kang)就是其本身，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)兩者對(dui)交(jiao)(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)的阻(zu)(zu)(zu)(zu)礙(ai)(ai)叫電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)抗(kang)(kang)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)容在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)中對(dui)交(jiao)(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)礙(ai)(ai)叫容抗(kang)(kang)，交(jiao)(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)頻率越(yue)大，容抗(kang)(kang)越(yue)小，有(you)隔直(zhi)通交(jiao)(jiao)(jiao)(jiao)的作用。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)中對(dui)交(jiao)(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)(zu)礙(ai)(ai)叫感(gan)(gan)抗(kang)(kang)，交(jiao)(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)頻率越(yue)大，感(gan)(gan)抗(kang)(kang)就越(yue)大，有(you)對(dui)交(jiao)(jiao)(jiao)(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)通直(zhi)隔交(jiao)(jiao)(jiao)(jiao)的作用，可進行濾波。
　　電(dian)源模(mo)塊內阻(zu)較大會不利(li)于負載(zai)穩(wen)壓(ya)電(dian)路工作(zuo)，嚴(yan)重(zhong)的(de)(de)負載(zai)電(dian)流任何變化(hua)都會導致模(mo)塊輸(shu)(shu)出的(de)(de)起伏(fu)(fu)，起伏(fu)(fu)對測試的(de)(de)影(ying)響和(he)脈沖與噪聲(sheng)對測試結(jie)果的(de)(de)影(ying)響一樣。當線(xian)電(dian)壓(ya)或負載(zai)電(dian)流變化(hua)時(shi)，直(zhi)流電(dian)源模(mo)塊的(de)(de)輸(shu)(shu)出電(dian)壓(ya)會有所起伏(fu)(fu)。穩(wen)壓(ya)程度由穩(wen)壓(ya)電(dian)路的(de)(de)參(can)數(shu)，濾波(bo)電(dian)容容量和(he)能量釋放(fang)的(de)(de)速率所決定，穩(wen)定大小是空載(zai)或滿載(zai)時(shi)輸(shu)(shu)出電(dian)壓(ya)的(de)(de)百(bai)分比或變化(hua)值(zhi)。
　　瞬(shun)(shun)態響應或(huo)恢復(fu)(fu)(fu)時(shi)(shi)(shi)間(jian)一般(ban)在負載(zai)(zai)變(bian)化10%時(shi)(shi)(shi)，常(chang)用(yong)輸(shu)(shu)出(chu)偏(pian)離(li)峰值(zhi)電壓的毫(hao)伏(fu)數(shu)標(biao)(biao)(biao)定(ding)輸(shu)(shu)出(chu)偏(pian)離(li)量，用(yong)輸(shu)(shu)出(chu)恢復(fu)(fu)(fu)到(dao)正(zheng)常(chang)值(zhi)所(suo)用(yong)毫(hao)伏(fu)數(shu)標(biao)(biao)(biao)出(chu)恢復(fu)(fu)(fu)時(shi)(shi)(shi)間(jian)。電源(yuan)模塊(kuai)瞬(shun)(shun)態響應和恢復(fu)(fu)(fu)時(shi)(shi)(shi)間(jian)的大(da)小(xiao)表(biao)明輸(shu)(shu)出(chu)負載(zai)(zai)在突然變(bian)化時(shi)(shi)(shi)，穩壓電路恢復(fu)(fu)(fu)正(zheng)常(chang)電壓能(neng)力的大(da)小(xiao)，一般(ban)是用(yong)當負載(zai)(zai)突然發(fa)生變(bian)化時(shi)(shi)(shi)輸(shu)(shu)出(chu)的偏(pian)離(li)值(zhi)或(huo)是輸(shu)(shu)出(chu)恢復(fu)(fu)(fu)到(dao)原(yuan)來值(zhi)所(suo)用(yong)的時(shi)(shi)(shi)間(jian)來標(biao)(biao)(biao)定(ding)。

　　阻(zu)(zu)抗匹(pi)配可以調整負載功率和抑制信號反射，信號源或傳(chuan)輸線跟負載間(jian)達到合適搭配叫做阻(zu)(zu)抗匹(pi)配。對于一(yi)個純電(dian)(dian)阻(zu)(zu)電(dian)(dian)路或低頻電(dian)(dian)路，電(dian)(dian)容電(dian)(dian)感的(de)電(dian)(dian)抗值基本可以忽略，電(dian)(dian)路阻(zu)(zu)抗主要來源電(dian)(dian)阻(zu)(zu)。

　　在高(gao)頻(pin)領(ling)(ling)域中(zhong)，當信(xin)(xin)(xin)號(hao)波(bo)長和傳輸線長處(chu)于相(xiang)同量(liang)級時，反射信(xin)(xin)(xin)號(hao)易與原(yuan)信(xin)(xin)(xin)號(hao)混疊(die)，而阻(zu)(zu)抗(kang)(kang)(kang)匹配可以(yi)有效減少消除高(gao)頻(pin)信(xin)(xin)(xin)號(hao)反射。PCB走線阻(zu)(zu)抗(kang)(kang)(kang)主(zhu)要(yao)來(lai)自寄(ji)生電容、電感、電阻(zu)(zu)，因素有材料介電常數、線寬、線厚和焊盤的(de)厚度等。高(gao)頻(pin)領(ling)(ling)域中(zhong)信(xin)(xin)(xin)號(hao)頻(pin)率對(dui)PCB走線的(de)阻(zu)(zu)抗(kang)(kang)(kang)值影響很(hen)大(da)，當數字信(xin)(xin)(xin)號(hao)邊沿時間小(xiao)于1ns或模擬(ni)信(xin)(xin)(xin)號(hao)頻(pin)率超(chao)過(guo)300M就要(yao)考慮阻(zu)(zu)抗(kang)(kang)(kang)問(wen)題。
　　目(mu)前阻(zu)抗匹(pi)(pi)配的(de)方(fang)法主要有改(gai)變阻(zu)抗力或(huo)調(diao)整(zheng)傳(chuan)輸線兩種。改(gai)變阻(zu)抗力是指通過(guo)電(dian)容(rong)、電(dian)感與負(fu)(fu)載的(de)串聯并(bing)聯調(diao)整(zheng)負(fu)(fu)載阻(zu)抗值，達(da)到源(yuan)和負(fu)(fu)載阻(zu)抗匹(pi)(pi)配。調(diao)整(zheng)傳(chuan)輸線是加(jia)長源(yuan)和負(fu)(fu)載間的(de)距離，配合電(dian)容(rong)電(dian)感把阻(zu)抗力調(diao)為零。
　　開(kai)關電(dian)源目標阻抗(kang)是(shi)電(dian)源系(xi)(xi)統的瞬態阻抗(kang)，和一定(ding)寬度的頻段有關，在(zai)相(xiang)同條(tiao)件下(xia)，電(dian)源系(xi)(xi)統的頻率越大，其(qi)阻抗(kang)越大。