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鐧婚寗 | 鍏嶈不(f猫i)娉ㄥ唺
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銆�銆�---鐢变簬 VCO 杓稿嚭璺熻工鍙冭�冭几鍏ワ紝鍥犳杓稿嚭鐨勭簿纰哄害鑸囧弮鑰冭几鍏ョ殑绮剧⒑搴︾浉鍚�銆傞�欏氨鏄锛屽鏋滃弮鑰冭几鍏ラ毃婧害鎴栨檪(sh铆)闁撶櫦(f膩)鐢熻畩鍖�锛岄偅涔堟檪(sh铆)閻樼櫦(f膩)鐢熷櫒鐨勮几鍑轰篃鏈冮毃涔嬭畩鍖栥�傞�欑ó灞�у叿鏈変竴鍊�(g猫)閲嶈鐨勫ソ铏�锛屽鏋滆ō(sh猫)瑷�(j矛)涓渶绮剧⒑鐨勫弮鑰冪敤浣滄檪(sh铆)閻樼櫦(f膩)鐢熷櫒鐨勮几鍏ワ紝閭ｄ箞鏅�(sh铆)閻樼櫦(f膩)鐢熷櫒鐨勬墍鏈夊叾浠栬几鍑虹劇闇�椤嶅鎴愭湰灏遍兘鑳界嵅寰楃簿纰哄弮鑰冪殑绮剧⒑搴�锛佷笉閬庯紝鏅�(sh铆)閻樼櫦(f膩)鐢熷櫒鍙兘鏈冩坊鍔犱竴鍊�(g猫)鍥哄畾鐨勬簴(zh菙n)纰哄害瑾ゅ樊锛岄�欏彇姹轰簬 P 鑸� Q 瑷�(j矛)鏁�(sh霉)鐨勬暩(sh霉)瀛楀搴︿互鍙婂弮鑰冭几鍏ラ牷鐜囪垏 VCO 闋荤巼涔嬮枔鐨勯棞(gu膩n)绯�銆傚ぇ澶氭暩(sh霉)鏅�(sh铆)闁撳収(n猫i)锛屾檪(sh铆)閻樼櫦(f膩)鐢熷櫒閮借兘鐢熸垚婧�(zh菙n)纰虹巼瑾ゅ樊鐐洪浂鐨勮几鍑�锛屼絾鏈夋檪(sh铆)鍓囨渻娣诲姞灏戦噺鐨勮宸�銆�
銆�銆�---渚嬪锛屽皪浜� 7 浣� Q 鍒嗗鍣ㄨ垏 8 浣� P 鍒嗗鍣ㄨ�岃█锛岀偤浜嗕互 13.5 MHz 鐨勮几鍏ョ嵅寰� 83.3330 MHz 鐨勮几鍑�锛岀殑鍋氭硶灏辨槸璁� P = 179銆丵 = 29銆傜敱浜� FREF/Q = FVCO/P锛堥憭鐩稿櫒闋荤巼锛�锛屽洜姝� FVCO 鐨勮▓(j矛)绠楁柟绋嬪紡鐐� FVCO = P/Q 脳 FREF銆傞�欓噷锛孎(xi脿n)VCO = (179/29) 13.5 MHz = 83.327586 MHz銆傞�欏氨鏄锛孷CO 闋荤巼灏囩偤 5.414 kHz锛屾瘮鐞嗘兂鐨勯牷鐜囦綆 65 PPM銆傞�欏皪鐢ㄤ綔鏅�(sh铆)閻樻簮鐨勬櫠楂旂殑瀹瑰樊銆佹韩搴﹁垏鑰佸寲鑰岃█鏈冨鍔犺宸��
銆�銆�---濡傛灉鎴戝�戝皣P鍒嗗鍣ㄧ殑绮惧害 (resolution) 澧炲姞鐐� 9 浣�锛岄偅涔堟渻鐧�(f膩)鐢熶粈涔堟儏娉佸憿锛熼�欎娇鎴戝�戣兘澶犱娇鐢ㄦ洿濂界殑瑙ｆ焙鏂规锛岄�欐檪(sh铆) P = 500銆丵 = 81?锛孎(xi脿n)鍦�锛孎(xi脿n)VCO = 500/81 脳 13.5 MHz = 83.333333 MHz锛岄�欐ǎ灏卞緱鍒�333 Hz锛屾瘮鐞嗘兂闋荤巼楂樺嚭4脳10-6锛屾瘮姝ゅ墠鎯呮硜涓嬬殑-65 PPM 婧�(zh菙n)纰哄害瑕侀珮寰楀銆�
銆�銆�---閭ｄ箞锛屾垜鍊�?n猫i)缁炬枴?j矛)绠楃壒瀹氭櫠楂旀檪(sh铆)閻樼櫦(f膩)鐢熷櫒杓稿嚭鐨勮垏鏈�灏忛牷鐜囧憿锛熷鏋滄檪(sh铆)閻樼櫦(f膩)鐢熷櫒婧�(zh菙n)纰哄害瑾ゅ樊鐐�+4脳10-6锛岄偅涔堥渶瑕佸鍔犳櫠楂斿宸�銆佽�佸寲浠ュ強婧害鐗规��銆備緥濡傦紝鏅堕珨瀹瑰樊鐐�+/- 30脳10-6锛岄毃婧害璁婂寲鐨勬敼璁婂箙搴﹀湪 +/- 50脳10-6 涔嬪収(n猫i)锛屾瘡骞村亸绉诲湪 +/- 5脳10-6 涔嬪収(n猫i)銆傞�欐ǎ锛岄�欑ó鏅堕珨涓夊勾涔嬪悗鏅�(sh铆)閻樼櫦(f膩)鐢熷櫒鐨勮几鍑洪牷鐜囧氨鏈冮珮閬�(d谩) + 4 + 30 + 50 + 3脳5= +99脳10-6鎴栦綆鑷� + 4- 30- 50 -3脳5=-91脳10-6銆傚洜姝�锛屽鏋滄垜鍊戣姹傝畩鍖栦繚鎸佸湪 +/-100 脳10-6涔嬪収(n猫i)鐨勮┍锛岄偅涔堥�欑ó鏅�(sh铆)閻樼櫦(f膩)鐢熷櫒閰嶇疆鐨勬櫠楂旀瘮杓冨悎鐞嗙殑瑷�(sh猫)瑷�(j矛)浣跨敤澹藉懡灏辨槸涓夊勾銆�
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