有源滤波器相位响应.PDF

鏈夋簮婊ゆ尝鍣ㄧ浉浣嶅搷搴 绗? 閮ㄥ垎锛氬甫閫氬搷搴 浣滆€咃細Hank Zumbahlen 绠€浠 1 婊ゆ尝鍣ㄧ殑甯﹀(BW) 瀹氫箟涓猴細 鍦ㄦ湰绯诲垪鐨勭涓€绡囨枃绔犱腑 锛屾垜鑰冨療浜嗘护娉㈠櫒鐩镐綅涓庢护娉㈠櫒瀹 鐜版嫇鎵戠粨鏋勭殑鍏崇郴銆傚湪绗簩绡囨枃绔犱腑2 锛屾垜鑰冨療浜嗕綆閫氬拰楂橀€ BW = FH 鈥 FL (4) 鍝嶅簲婊ゆ尝鍣ㄤ紶閫掑嚱鏁扮殑鐩镐綅鍋忕Щ銆傝繖绡囨枃绔犲皢閲嶇偣璁ㄨ甯﹂€ 鍙互璇佹槑锛岃皭鎸鐜 (F ) 涓篎 鍜孎 鐨勫嚑浣曞钩鍧囧€硷紝杩欏氨鎰忓懗 0 L H 鍝嶅簲銆傝櫧鐒舵护娉㈠櫒涓昏閽堝骞呭害鍝嶅簲鑰岃璁★紝浣嗗湪涓€浜涘簲鐢 鐫€锛孎 鍦ㄥ鏁板昂搴︿笂灏嗗嚭鐜板湪F 鍜孎 浜岃€呯殑涓偣銆 0 L H 涓紝鐩镐綅鍝嶅簲鍙兘闈炲父閲嶈銆 (5) 鍑轰簬鑰冨療鐩殑锛屾湁婧愭护娉㈠櫒鐨勪紶閫掑嚱鏁板疄闄呬笂鏄护娉㈠櫒浼犻€ 鍙﹂渶娉ㄦ剰鐨勬槸锛屽湪瀵规暟灏哄害涓婏紝甯﹂€氬搷搴旂殑娉㈣鍦‵0 宸﹀彸濮 鍑芥暟鍜屾斁澶у櫒浼犻€掑嚱鏁扮殑绾ц仈 锛堣鍥?锛夈€ 缁堟槸瀵圭О鐨勩€ 甯﹂€氭护娉㈠櫒瀵瑰悇绉峇鍊肩殑骞呭害鍝嶅簲濡傚浘2鎵€绀恒€傚湪姝ゅ浘涓紝涓 鍥?. 婊ゆ尝鍣ㄤ綔涓轰袱涓紶閫掑嚱鏁扮殑绾ц仈銆 蹇冮鐜囩殑澧炵泭褰掍竴鍖栦负1 (0 dB)銆 甯﹂€氫紶閫掑嚱鏁 鎶婁綆閫氬師鍨嬬殑鍒嗗瓙鏀逛负H0 锛岀粨鏋滃皢鎶婃护娉㈠櫒鍙樻垚涓€涓甫閫 鍑芥暟銆傝繖浼氬湪浼犻€掑嚱鏁板唴寮曞叆涓€涓浂鐐广€傚垎瀛愪腑鐨勪竴涓猻寰楀埌 涓€涓浂鐐癸紝鍒嗘瘝涓殑涓€涓猻寰楀埌鏋佺偣銆傞浂鐐瑰皢浜х敓棰戠巼涓婂崌鍝 搴旓紝鑰屾瀬鐐瑰皢浜х敓棰戠巼涓嬮檷鍝嶅簲銆 浜岄樁甯﹂€氭护娉㈠櫒鐨勪紶閫掑嚱鏁板彉涓猴細 (1) 鍥?. 褰掍竴鍖栫殑甯﹂€氭护娉㈠櫒骞呭害鍝嶅簲 姝ゅ鐨勏変负婊ゆ尝鍣ㄥ鐩婂嘲鍊煎寲鏃剁殑棰戠巼(F = 2 蟺 蠅 ) 銆 0 0 铏界劧鏈枃涓昏鍏虫敞鐩镐綅鍝嶅簲锛屼絾浜嗚В涓嬫护娉㈠櫒骞呭害鍝嶅簲涔熷緢 H0涓虹數璺鐩 锛圦宄板€煎寲锛夛紝瀹氫箟涓猴細 鏈夌敤銆 H0 = H/Q (2) 杩欓噷闇€瑕佹彁閱掍竴涓嬨€傚甫閫氭护娉㈠櫒鏈変袱绉嶅畾涔夋柟寮忋€傜獎甯︽儏鍐典负 鍏朵腑锛孒涓烘护娉㈠櫒瀹炵幇鐨勫鐩娿€ 缁忓吀瀹氫箟锛屽涓婃枃鎵€绀恒€傜劧鑰岋紝鍦ㄦ煇浜涙儏鍐典笅锛屽鏋滈珮銆佷綆鎴 瀵瑰甫閫氬搷搴旀潵璇达紝Q鏈夌壒娈婃剰涔夈€傚畠鏄护娉㈠櫒鐨勯€夋嫨鎬с€傚畾 姝㈤鐜囩浉宸緢澶э紝鍒欏甫閫氭护娉㈠櫒閲囩敤鐙珛鐨勯珮閫氬拰浣庨€氶儴鍒