ON放大器電流的流通角為360o，合用于小信號與低功率的放大。在乙類放大器的電流來說是有的行為與流通；丙類放大器電流的流通角則小于180o。乙類和丙類都合用于大功率作業丙類作業狀況的輸出功率和功率是三種作業狀況中。ON放大器對于高頻功率放大器大多作業于丙類。ON放大器的電流波形式與真心對待依舊，因此不能用于低頻功率放大，只能用于采用調諧回路作為負載的諧振功率放大。因為調諧回路具有濾波能力，回路電流與電壓依舊近于正弦波形，失真很小。

ON放(fang)(fang)大(da)器(qi)(qi)(qi)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)放(fang)(fang)大(da)器(qi)(qi)(qi)是(shi)通(tong)訊系統(tong)中發送設(she)備的(de)重(zhong)要組件(jian)。按(an)其作(zuo)業頻(pin)(pin)(pin)帶的(de)寬(kuan)(kuan)(kuan)(kuan)窄劃分為窄帶高(gao)頻(pin)(pin)(pin)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)放(fang)(fang)大(da)器(qi)(qi)(qi)和寬(kuan)(kuan)(kuan)(kuan)帶高(gao)頻(pin)(pin)(pin)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)放(fang)(fang)大(da)器(qi)(qi)(qi)兩種(zhong)，ON放(fang)(fang)大(da)器(qi)(qi)(qi)的(de)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)放(fang)(fang)大(da)器(qi)(qi)(qi)通(tong)常以具有(you)選頻(pin)(pin)(pin)濾波作(zuo)用的(de)電(dian)路(lu)作(zuo)為輸出回(hui)路(lu)，故又稱(cheng)為調(diao)諧功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)放(fang)(fang)大(da)器(qi)(qi)(qi)或諧振功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)放(fang)(fang)大(da)器(qi)(qi)(qi)；寬(kuan)(kuan)(kuan)(kuan)帶高(gao)頻(pin)(pin)(pin)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)的(de)放(fang)(fang)大(da)器(qi)(qi)(qi)與輸出的(de)電(dian)路(lu)則是(shi)傳輸線(xian)(xian)變壓器(qi)(qi)(qi)或其他寬(kuan)(kuan)(kuan)(kuan)帶匹配電(dian)路(lu)，因(yin)此又稱(cheng)為非調(diao)諧功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)放(fang)(fang)大(da)器(qi)(qi)(qi)。高(gao)頻(pin)(pin)(pin)功(gong)(gong)(gong)(gong)(gong)率(lv)(lv)放(fang)(fang)大(da)器(qi)(qi)(qi)是(shi)一種(zhong)轉化器(qi)(qi)(qi)件(jian)，它將(jiang)電(dian)源(yuan)供給的(de)直(zhi)流轉化成為高(gao)頻(pin)(pin)(pin)溝(gou)通(tong)輸出在(zai)低頻(pin)(pin)(pin)電(dian)子線(xian)(xian)路(lu)課(ke)程(cheng)中已知，放(fang)(fang)大(da)器(qi)(qi)(qi)可(ke)以按(an)照電(dian)流導通(tong)角(jiao)的(de)不(bu)同，將(jiang)其分為甲、乙、丙(bing)三類作(zuo)業狀況(kuang)。

信息來源：ON放大器(qi)，ON比較器(qi)，ON電源管理芯片，ON音頻ASSP，傳感器(qi)，on微控制器(qi)