銆�銆�鍦ㄥ��(sh铆)闅涚殑閫氫俊绯荤当(t菕ng)涓�锛屾敎甯舵��(sh霉)瀛椾俊鎭�鐨勪俊铏�(h脿o)閫氬父鏄�鐢辨煇绋�椤炲瀷鐨勮級娉㈣��(di脿o)鍒舵柟寮忕櫦(f膩)閫佺殑锛屽偝閫佷俊铏�(h脿o)鐨勫付瀵�闄愬埗鍦ㄤ互杓夋尝鐐轰腑蹇冪殑涓�鍊�(g猫)闋绘�典��锛屽�傞洐閭婂付瑾�(di脿o)鍒�锛屾垨鍦ㄩ劙杩戣級娉㈢殑闋绘�典笂锛屽�傚柈閭婂付瑾�(di脿o)鍒�銆傜劇璜栦綍绋�瑾�(di脿o)鍒舵柟寮忥紝鍦ㄧ櫦(f膩)閫佺��鍧囬渶瑕佷竴鍊�(g猫)楂橀牷杓夋尝灏囦俊鎭�瑾�(di脿o)鍒朵笂鍘�锛屼互娓涘皬淇¤櫉(h脿o)琛拌惤锛岀浉骞茶В瑾�(di脿o)鏅�(sh铆)鍦ㄦ帴鏀剁��涔熼渶瑕佷竴鍊�(g猫)鑸囩櫦(f膩)閫佺��鍚岄牷鍚岀浉鐨勯珮闋昏級娉㈠皣淇℃伅寰為珮闋讳笂瑙ｈ��(di脿o)涓嬩締銆傜偤浜嗙敘(ch菐n)鐢熼�欏��(g猫)楂橀牷杓夋尝锛屽湪鏁�(sh霉)瀛楅浕璺�涓�鏄�閲囩敤鏁�(sh霉)鎺ф尟钑╁櫒(NCO)锛屼篃绋辩偤鐩存帴鏁�(sh霉)瀛楅牷鐜囧悎鎴愬櫒銆擠DS)锛屽畠鐨勮几鍑洪牷鐜囧拰鐩镐綅鍙�浠ュ彈浜虹偤鎺у埗锛屽緸鑰屾豢瓒冲悇绋�闇�瑕�銆�

銆�銆�瀵�(sh铆)鏅�(sh铆)瑷�(j矛)绠楁硶鐨勬�ｅ鸡娉㈡ǎ鏈�浠ュ��(sh铆)鏅�(sh铆)瑷�(j矛)绠楃敘(ch菐n)鐢燂紝瑭叉柟娉曞洜鍏惰▓(j矛)绠楅渶瑕佽�楄不(f猫i)寰堝�氭��(sh铆)闁�锛屽洜鑰屽彧鑳界敘(ch菐n)鐢熻純浣庨牷鐜囩殑姝ｅ鸡娉�锛岃�屼笖瀛樺湪瑷�(j矛)绠楃簿搴﹁垏瑷�(j矛)绠楁檪(sh铆)闁撶殑鐭涚浘銆傜敱浜庡湪闇�瑕佺敘(ch菐n)鐢熼珮閫熺殑姝ｄ氦淇¤櫉(h脿o)鏅�(sh铆)锛屽��(sh铆)鏅�(sh铆)瑷�(j矛)绠楁硶灏囩劇娉曞��(sh铆)鐝�(xi脿n)銆傚洜姝�锛屽湪瀵�(sh铆)闅涙噳(y墨ng)鐢ㄤ腑涓�鑸�閲囩敤鏈�鏈夋晥銆佹渶绨″柈鐨勬煡琛ㄦ硶锛屽嵆浜嬪厛鏍规摎(j霉)鍚勫��(g猫)NCO姝ｅ鸡娉㈢殑鐩镐綅瑷�(j矛)绠楀ソ鐩镐綅鐨勬�ｅ鸡鍊�锛屽苟鎸夌浉浣嶄綔鐐哄湴鍧�淇℃伅瀛樺劜(ch菙)瑭茬浉浣嶇殑姝ｅ鸡鍊兼暩(sh霉)鎿�(j霉)銆�

銆�銆�鏁�(sh霉)鎺ф尟钑╁櫒涓�鑸�鐢卞熀婧�(zh菙n)鏅�(sh铆)閻�(fclk)銆佺浉浣嶅瓧瀵勫瓨鍣ㄣ�佺浉浣嶇疮鍔犲櫒浠ュ強骞呭害/鐩镐綅杞�(zhu菐n)鎻涢浕璺�绛夐儴鍒嗙祫鎴�銆�

銆�銆�1.鐩镐綅绱�鍔犲櫒灏�(du矛)杓稿叆闋荤巼鎺у埗瀛桵涓嶆柗绱�鍔狅紝寰楀埌浠ヨ┎闋荤巼瀛楃偤姝ラ��(j矛n)鐨勬暩(sh霉)瀛楃浉浣�銆�

銆�銆�2.鍑芥暩(sh霉)鐧�(f膩)鐢熸ā濉婏紝灏�(du矛)鐣�(d膩ng)鍓嶇浉浣嶉��(j矛n)琛屽皪(du矛)鎳�(y墨ng)骞呭害杞�(zhu菐n)鎻涘悗锛屽彲浠ヨ几鍑轰换鎰忓嚱鏁�(sh霉)鐨勬尝褰�銆�

銆�銆�鍑芥暩(sh霉)鐧�(f膩)鐢熸ā濉婃渶鐩存帴鐨勫��(sh铆)鐝�(xi脿n)鏂规硶鏄�鍙�璁�瀛樺劜(ch菙)鍣ㄦ煡鎵捐〃(ROM LUT)娉�锛屽皣姝ｃ�佷綑寮︽尝褰㈢殑鎶芥ǎ瀛樻斁鍦≧OM涓�锛屽苟閫氶亷涓�鍊�(g猫)DAC鍛ㄦ湡鍦伴��(j矛n)琛岃几鍑�锛屽緸鑰岀敘(ch菐n)鐢熻几鍑烘尝褰�銆傚�傝几鍑轰俊铏�(h脿o)骞呭害浣嶆暩(sh霉)鐐篴锛岀浉浣嶅湴鍧�浣嶆暩(sh霉)n鎵�闇�鏌ユ壘琛ㄧ殑澶у皬鐐篴脳2n銆傜祼(ji茅)鍚堜笂鏂囩祼(ji茅)璜栧彲鐭�锛岄牷鐜囧垎杈ㄧ巼瓒婇珮锛屾墍闇�瑕佺殑ROM瓒婂ぇ锛屽拰n鐐烘寚鏁�(sh霉)澧為暦闂�(gu膩n)绯�?锛熸ⅱ?锛孯OM LUT娉曞緢闆ｅ吋椤у姛鑰�銆佹�ц兘銆佹垚鏈�涓夋柟闈�锛岃�孋ORDIC绠楁硶鐨勬噳(y墨ng)鐢ㄨ兘澶犲緢濂藉湴瑙ｆ焙閫欎竴鍟忛�屻��

銆�銆�3.鐩镐綅鐩稿姞鍣ㄥ皣鐩镐綅瀵勫瓨鍣ㄤ腑鐨勬暩(sh霉)瀛楃浉浣嶈垏鐩镐綅鎺у埗瀛楃浉鍔�锛屽緱鍒板亸绉诲悗鐨勭暥(d膩ng)鍓嶇浉浣嶃��

銆�銆�瑷�(sh猫)绯荤当(t菕ng)鐨勬檪(sh铆)閻橀牷鐜囩偤fc锛岄牷鐜囨帶鍒跺瓧鐐篗锛岀浉浣嶅瘎瀛樺櫒浣嶆暩(sh霉)鐐篘锛屽墖鏁�(sh霉)鎺ф尟钑╁櫒杓稿嚭淇¤櫉(h脿o)闋荤巼鐐�銆傛牴鎿�(j霉)Nyquist鎶芥ǎ瀹氱悊锛宖s鍊肩偤1/2fc锛岃�屽湪瀵�(sh铆)闅涜ō(sh猫)瑷�(j矛)涓�锛屼竴鑸�涓嶆��(y墨ng)澶т簬鏅�(sh铆)閻橀牷鐜囩殑1/4銆傚叾闋荤巼鍒嗚鲸鐜囩偤锛屾牴鎿�(j霉)姝ゅ紡锛屽湪绯荤当(t菕ng)鏅�(sh铆)閻橀牷鐜囦笉璁婄殑鎯呮硜涓嬶紝鐩镐綅瀵勫瓨鍣ㄤ綅鏁�(sh霉)N瓒婂ぇ锛岀敘(ch菐n)鐢熶俊铏�(h脿o)鐨勯牷鐜囧垎杈ㄧ巼瓒婇珮銆�

銆�銆�NCO鐨勬�ц兘鎸囨��(bi膩o)鍖呮嫭淇¤櫉(h脿o)闋荤巼鍒嗚鲸鐜�銆佷俊鍣�姣�(SNR)銆佺劇闆滄暎鍕�(d貌ng)鎱�(t脿i)鑼冨湇(SFDR)鍜岃几鍑虹殑淇¤櫉(h脿o)姝ｄ氦鎬�銆傞�欎簺鎬ц兘鎸囨��(bi膩o)鍙栨焙浜嶯CO鐨勬暩(sh霉)鎿�(j霉)浣嶆暩(sh霉)銆侼CO鐨勬暩(sh霉)鎿�(j霉)浣嶆暩(sh霉)鍖呮嫭鐢ㄤ簬琛ㄧず鐩镐綅鏁�(sh霉)鎿�(j霉)鐨勪綅鏁�(sh霉)n鍜岃〃绀虹浉浣嶇殑姝ｅ鸡鍊兼暩(sh霉)鎿�(j霉)鐨勪綅鏁�(sh霉)nb锛屼簩鑰呬箣闁撳瓨鍦╪b鍙栨焙浜巒鐨勯棞(gu膩n)绯�锛屼笖鍓嶈�呭繀闋堣兘澶犺〃绀虹浉浣嶈畩鍖栨檪(sh铆)鍏剁浉浣嶆�ｅ鸡鍊艰畩鍖栫殑鏈�灏忓�煎拰鍊�銆傝�岄�欏張鍒嗙偤鍏╃ó鎯呮硜锛�

銆�銆�绋�鎯呮硜鏄�鐩镐綅鏈�灏忚畩鍖栧�肩殑姝ｅ鸡鍊兼渶灏忚畩鍖栫櫦(f膩)鐢熷湪蟺/2-鈻诚嗭綖蟺/2锛屜�/2锝炏�/2+鈻诚�锛�3蟺/2-鈻诚嗭綖3蟺/2锛�3蟺/2锝�3蟺/2+鈻诚�锛屽悓鏅�(sh铆)鍏剁浉浣嶇殑鍙栧�兼槸鍦�0锝�2蟺闁撲笖绛夐枔闅斿湴鍒嗙偤2n鐖�鍙栧�奸粸(di菐n)锛屽洜姝わ紝鐢辨�ｅ鸡娉㈢殑鐗规�у彲鐭ワ細鍙�闇�瑕佽◣璜栫浉浣嶅湪蟺/2-鈻诚嗚垏蟺/2鍙栧�奸粸(di菐n)鐨勬�ｅ鸡鍊间箣宸�锛�

銆�銆�绗�浜岀ó鎯呮硜鏄�鐩镐綅鏈�灏忚畩鍖栧�肩殑姝ｅ鸡鍊肩殑璁婂寲鐧�(f膩)鐢熷湪0锝炩柍蠁锛屜�-鈻诚嗭綖蟺锛屜�锝炏�+鈻诚�锛�2蟺-鈻诚嗭綖2蟺鍙栧�奸粸(di菐n)铏曘�傝┎鎯呮硜鍙�浠ラ�氶亷椤炰技浜庣ó鎯呮硜鐨勬帹灏�(d菐o)鏂规硶寰楀埌銆�

銆�銆�NCO鐨勫櫔鑱叉槸鍥�?y脿n)姒囧瑬璋☆惛鎶戞。鐗х倳顖奰宸�鑰屽紩鍏ョ殑锛屼笖閲忓寲瑾ゅ樊鐢辫〃绀烘�ｅ鸡鍊肩殑浣嶆暩(sh霉)姹哄畾銆�

銆�銆�涓嬪湒鐐� NCO 鐨勫伐浣滃師鐞嗘�嗗��:

銆�銆�鏁�(sh霉)鎺ф尟钑╁櫒涓�鑸�鐢卞熀婧�(zh菙n)鏅�(sh铆)閻�(fclk)銆佺浉浣嶅瓧瀵勫瓨鍣�銆佺浉浣嶇疮鍔犲櫒浠ュ強骞呭害/鐩镐綅杞�(zhu菐n)鎻涢浕璺�绛夐儴鍒嗙祫鎴愩�傚湪鍩烘簴(zh菙n)鏅�(sh铆)閻樼殑浣滅敤涓�锛屾瘡涓�鍊�(g猫)鏅�(sh铆)閻樺懆鏈熷瓨璨�鍦ㄧ浉浣嶅瓧瀵勫瓨鍣ㄩ噷鐨勫�奸兘鐢辩浉浣嶇疮鍔犲櫒閫�(j矛n)琛岀疮鍔狅紝鐩镐綅鏋滃姞鍣ㄧ殑杓稿嚭浣滅偤鏌ユ壘琛ㄧ殑杓镐汉锛屽緸鑰屽緱鍒扮浉灏�(du矛)鎳�(y墨ng)鐨勫箙搴﹀��銆傛牴鎿�(j霉)濂堝�庢柉鐗归噰妯ｅ畾寰嬶紝杓稿嚭淇¤��(h脿o)鐨勯牷鐜囨噳(y墨ng)灏忎簬鍩烘簴(zh菙n)鏅�(sh铆)閻樼殑 1/2銆�

銆�銆�鐩镐綅绱�鍔犲櫒杓稿��(鈻承�)鐨勬暩(sh霉)鍊煎拰绯荤当(t菕ng)鐨勯牷鐜�(fclk)姹哄畾浜嗚几鍑洪牷鐜�(fout),瀹冮杸鐨勯棞(gu膩n)绯诲�備��:

銆�銆�N鏄�鐩镐綅瀵勫瓨鍣ㄧ殑浣嶆��(sh霉)锛孨 鍊肩殑澶у皬姹哄畾浜嗛牷鐜囧垎杈ㄧ巼(fres )锛屾湁

銆�銆�鍦ㄩ�欓噷鍋囪ō(sh猫)锛宖clk=128MHz, N=32锛屽彲浠ヨ▓(j矛)绠楀嚭 NCO 鐨勯牷鐜囧垎杈ㄧ巼

銆�銆�fres=0.0298Hz

銆�銆�鐩镐綅绱�鍔犲櫒鏄�姹哄畾 NCO 闆昏矾鎬ц兘鐨勪竴鍊�(g猫)闂�(gu膩n)閸甸儴鍒�銆傛垜鍊戝彲浠ラ噰鐢ㄤ簡Altera鐨勫姞娉曞櫒瀹忓姛鑳芥ā濉婂舰鎴愪竴鍊�(g猫)32bit鐨勭疮鍔犲櫒锛屽畠浠ユ祦姘寸窔铏曠悊鏂瑰紡閫�(j矛n)琛屽伐浣�銆�

銆�銆�鐩镐綅/骞� 搴﹁綁(zhu菐n)鎻涢浕璺�鏄疦CO 闆昏矾涓�鐨勫彟涓�鍊�(g猫)闂�(gu膩n)閸甸儴鍒�锛屽湪瑷�(sh猫)瑷�(j矛)涓�闈㈣嚚鐨勪富瑕佸晱椤屽氨鏄�璩囨簮鐨勯枊閵�銆�

銆�銆�涓�鑸�闆昏矾閲囩敤ROM 绲�(ji茅)妲�(g貌u)锛岀浉浣嶇疮鍔犲櫒鐨勮几鍑烘槸涓�绋�鏁�(sh霉)瀛楀紡閶搁綊娉�锛岄�氶亷鍙栧畠鐨勮嫢骞蹭綅浣滅偤 ROM鐨勫湴鍧�杓镐汉锛岃�屽悗閫氶亷鏌ヨ〃鍜岄亱(y霉n)绠楋紝ROM灏辫兘杓稿嚭鎵�闇�娉㈠舰鐨勯噺鍖栨暩(sh霉)鎿�(j霉)銆�