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鍥犳閲囩敤鍏�(n猫i)鏍搁€熺巼杓冮珮鐨勫皥鐢ㄨ(di脿o)鍒惰姱鐗囷紝浣块珮閫熶俊铏熺殑鐢�(ch菐n)鐢�銆佽檿鐞�銆佹帶鍒躲€佸偝杓搁亷绋嬭灏侀枆鍦ㄥ柈涓€鑺墖鍏�(n猫i)瀹屾垚锛屽洖閬夸簡鐢盕PGA鐢�(ch菐n)鐢熼珮閫熸暩(sh霉)鎿�(j霉)娴佸付渚嗙殑鎶€琛�(sh霉)鍥伴洠锛屼互鍙奝CB瑷�(sh猫)瑷�(j矛)鐨勫京(f霉)闆滃寲銆侫DI鍏徃閲濆皪閫氫俊甯傚牬瑷�(sh猫)瑷�(j矛)鐨勯珮閫熸暩(sh霉)瀛椾笂璁婇牷鍣ˋD9957鏄(sh铆)鐝�(xi脿n)楂橀€熸暩(sh霉)瀛楄(di脿o)鍒剁殑鍏锋湁鏅亶閬╂噳(y墨ng)鎬х殑涓€娆鹃珮鎬ц兘鑺墖銆�

1.AD9957鏁�(sh霉)瀛椾笂璁婇牷鍣ㄥ熀鏈妧琛�(sh霉)鐗规€�

1.1鍩烘湰鎶€琛�(sh霉)鎸囨(bi膩o)

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1GSPS鍏�(n猫i)閮ㄦ檪閻橀€熺巼锛屾ā鎿几鍑轰俊铏熸渶楂橀牷鐜囩偤400MHz锛�1GSPS鍚屾鏅傞悩锛�14bD/A杓稿嚭锛涚浉浣嶅櫔鑱插皬浜�125dBc/Hz(400MHz)锛�8鍊嬪彲绶ㄧ▼閸垫帶娉㈠舰瀛樺劜瀵勫瓨鍣�(閸垫帶骞呭害銆侀牷鐜囥€佺浉浣�)锛涙浜や俊铏熻几鍏ラ€熺巼鐐�250MHz/18b锛涗笁绋彲绶ㄧ▼宸ヤ綔妯″紡锛氭浜よ(di脿o)鍒舵柟寮�锛涘柈闊抽牷鏂瑰紡锛涘収(n猫i)鎻扗AC鏂瑰紡銆�

鐢变笂杩版妧琛�(sh霉)鎸囨(bi膩o)鍙煡鐢�(ch菐n)鐢熶竴鍊嬭級闋�100MHz鐨勪腑闋昏(di脿o)鍒朵俊铏�锛孉D9957鍦ㄦ渶楂樺収(n猫i)鏍告檪閻樼殑椹�(q奴)鍕曚笅鍙互瀵�(sh铆)鐝�(xi脿n)姣忓€嬫寮︽尝鍛ㄦ湡浠�10鍊嬮洟鏁ｅ箙搴﹂粸(di菐n)杓稿嚭锛岃秴閬庨珮璩�(zh矛)閲忔尝褰㈣姹傜殑8鍊嬮洟鏁ｅ箙搴﹂粸(di菐n)銆傛澶�8鍊嬮嵉鎺ф尝褰㈠瓨鍎插瘎瀛樺櫒锛屽彲浠ラ€氶亷鎺у埗淇¤櫉灏嶅瓨鍎叉尝褰㈢殑鍒囨彌瀵�(sh铆)鐝�(xi脿n)MSK锛孊PSKQPSK锛�8P-SK锛孧FSK绛夊绋珮閫熺巼鐨勮(di脿o)闋�銆佽(di脿o)鐩镐俊铏熴€�14b鐨凞/A鍙(sh铆)鐝�(xi脿n)84dB杓稿嚭淇¤櫉鍕曟厠(t脿i)鑼冨湇銆傚湪姝ｄ氦瑾�(di脿o)鍒跺伐浣滄ā寮忎笅鏈€澶у熀甯剁⒓娴佺殑杓稿叆閫熺巼鍙仈(d谩)250MSPS(I/Q鍏╄矾绺藉悎)銆�

1.2姝ｄ氦瑾�(di脿o)鍒舵柟寮忓伐浣滃師鐞�

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瑾�(di脿o)鍒�18bI璺�(鍚岀浉璺熀甯剁⒓娴�)鍜�18bQ璺�(姝ｄ氦璺熀甯剁⒓娴�)鏁�(sh霉)鎿�(j霉)瀵�(sh铆)鏅備氦鏇挎洿鏂�锛屼竴娆″収(n猫i)閮ㄩ噰妯ｅ彲灏嘔/Q鏁�(sh霉)鎿�(j霉)涓€璧锋彁鍙栧埌鍏�(n猫i)閮ㄥ瘎瀛樺櫒銆侫D9957鍏�(n猫i)閮ㄦ彁渚泂in鍜宑os鐨勬湰鍦�?c谩i)?sh霉)瀛楁尟钑╁櫒鍒嗗垾鍚孖锛孮杓稿叆鏁�(sh霉)鎿�(j霉)娴佺浉涔�锛岀敘(ch菐n)鐢熸浜よ(di脿o)鍒舵暩(sh霉)鎿�(j霉)娴佷箣鍚庣浉鍔狅紝濡備笅寮忥細

姝ｄ氦鏁�(sh霉)鎿�(j霉)娴佸湪骞呭害绯绘暩(sh霉)鎺у埗涓�锛岀稉(j墨ng)D/A杞�(zhu菐n)鎻涚敘(ch菐n)鐢熸ā鎿俊铏熻几鍑�銆傞€氶亷姝ｄ氦鏂瑰紡锛屽彲浠ュ(sh铆)鐝�(xi脿n)澶у鏁�(sh霉)瑾�(di脿o)闋�銆佽(di脿o)鐩搞€佽(di脿o)骞呬俊铏熺殑杓夋尝瑾�(di脿o)鍒�銆備互BPSK(浜岄€�(j矛n)鍒剁浉绉婚嵉鎺�)淇¤櫉鐐轰緥锛岃浣胯闋荤巼鐐合塩杓夋尝鍦ㄨ几鍏ョ⒓娴佺殑鎺у埗涓�锛岃級娉㈢浉浣嶅湪[0锛屜€]涔嬮枔璁婂寲锛岀敱涓婂紡鍙煡瑕佺敘(ch菐n)鐢烞PSK淇¤櫉锛屾浜よ矾鍩哄付纰兼祦Q鎳�(y墨ng)濮嬬祩鐐�0鑰屽悓鐩歌矾鍩哄付纰兼祦鎳�(y墨ng)鍦ㄦ鐨勬渶澶у€煎拰璨�(f霉)鐨勬渶澶у€间箣闁撹畩鍖�銆傜暥(d膩ng)I鐐�+MAX鏅俿in(蠅锛宼)鐨勭浉浣嶄笉璁�锛岀暥(d膩ng)I鐐�-MAX鏅俿in(蠅ct)鐨勭浉浣嶅弽杞�(zhu菐n)浜喯€銆�

QPSK鐨勭敘(ch菐n)鐢熸柟娉曡垏姝ら浼硷紝浣嗘浜よ矾鍩哄付纰兼祦涓嶇偤闆�銆傝€岀敱I鍜孮鐨�4绋帓鍒楃祫鎴愬皪鎳�(y墨ng)4绋笉鍚岀殑杓夋尝鍒濆鐩镐綅锛欼=MAX锛孮=0锛屽垵濮嬬浉浣嶇偤0锛汭=0锛孮=MAX锛屽垵濮嬬浉浣嶇偤蟺/2锛汭=-MAX锛孮=0锛屽垵濮嬬浉浣嶇偤蟺锛汭=0锛孮=-MAX锛屽垵濮嬬浉浣嶇偤-蟺/2銆�

姝ｄ氦瑾�(di脿o)鍒跺伐浣滄ā寮忎笅AD9957鍏峰倷鐢�(ch菐n)鐢熻純寰�(f霉)闆滅殑淇¤櫉鐨勮兘鍔�銆傚湪杓稿叆鍩哄付纰肩⒓閫熺巼浣庝簬AD9957鍏�(n猫i)鏍告檪閻�1/4鐨勫墠鎻愭浠朵笅锛屽彲閫氶亷鎺у埗I锛孮鐨勮几鍏ユ暩(sh霉)鎿�(j霉)锛屼娇杓稿嚭涓牷淇¤櫉鐨勯牷鐜囧拰鐩镐綅浠绘剰璁婂寲銆傚洜姝ゅ彲閫氶亷灏嶈几鍏ョ殑鍩哄付纰兼祦鍋氬墠绔烤娉㈣檿鐞�锛屼娇淇¤櫉鐨勯牷璀滅壒鎬у緱鍒版敼鍠�銆傝€孉D9957閫氶亷鍠煶闋绘柟寮忓(sh铆)鐝�(xi脿n)杓夋尝瑾�(di脿o)鍒剁敱浜庢尝褰㈠弮鏁�(sh霉)涓€娆＄疆鍏ュ緢闆ｅ(sh铆)鏅備慨姝ｏ紝鍥犳涓嶅叿鍌欑敘(ch菐n)鐢熻純寰�(f霉)闆滅殑淇¤櫉鐨勮兘鍔�銆�

1.3鍠煶闋绘柟寮忓伐浣滃師鐞�

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OSK(骞呭害閸垫帶)淇¤櫉鏄疉D9957鍦ㄥ柈闊抽牷宸ヤ綔鏂瑰紡涓嬪(sh铆)鐝�(xi脿n)杓夋尝瑾�(di脿o)鍒剁殑閲嶈淇¤櫉銆傜暥(d膩ng)绯荤当(t菕ng)闇€瑕佷互鑴堟矕鏂瑰紡杓稿嚭瑾�(di脿o)鍒朵俊铏熸檪锛屽彲浠ヤ娇AD9957宸ヤ綔鍦∣SK鏈夋晥妯″紡涓�锛岄€欐ǎ瑾�(di脿o)鍒朵俊铏熺殑杓稿嚭骞呭害鏈冨彈OSK淇¤櫉鐨勬帶鍒跺湪O鍜屾渶澶у€间箣闁撹畩鍖�锛屼娇涓牷瑾�(di脿o)鍒朵俊铏熶互鑴堟矕鏍煎紡杓稿嚭銆備腑闋昏(di脿o)鍒朵俊铏熻剤娌栧懆鏈熴€佽剤瀵拰OSK淇¤櫉涓€鑷�锛屼絾鐢变簬鑺墖鍏�(n猫i)閮ㄨ檿鐞嗗欢閬诧紝涓牷瑾�(di脿o)鍒朵俊铏熻几鍑烘渻婊悗OSK淇¤櫉骞惧€嬪井绉�(鍥哄畾鍊�)銆�

2.閫氶亷AD9957鐢�(ch菐n)鐢熻(di脿o)鍒朵俊铏�

MSK鍜孊PSK淇¤櫉鏄暩(sh霉)瀛楅€氫俊涓娇鐢ㄨ純鐐哄唬娉涚殑杓夋尝瑾�(di脿o)鍒舵柟寮忋€傞€氶亷AD9957寰堝鏄撶敘(ch菐n)鐢熼€欏叐绋俊铏熸尝褰�銆�

2.1鍩轰簬娉㈠舰鍙冩暩(sh霉)鎺у埗鐨凪SK瑾�(di脿o)鍒�

2.1.1MSK瑾�(di脿o)鍒朵俊铏熺壒鎬�

MSK鏈€灏忛牷绉婚嵉鎺ф槸瑾�(di脿o)鍒剁偤0.5涓旂浉浣嶉€ｇ簩(x霉)鐨凢SK杓夋尝瑾�(di脿o)鍒朵俊铏熴€傚叾鐗归粸(di菐n)濡備笅锛�

(1)宸茶(di脿o)淇¤櫉鐨勬尟骞呮槸鎭掑畾鐨�锛�

(2)淇¤櫉鐨勯牷鍋忓毚(y谩n)鏍肩瓑浜幝�1/4Ts(Ts鏄俊鎭⒓鐗囧搴�)锛岀浉鎳�(y墨ng)鐨勮(di脿o)鍒舵寚鏁�(sh霉)h=(f2-f1)/Ts=1/2锛�

(3)浠ヨ級娉㈢浉浣嶇偤鍩烘簴(zh菙n)鐨勪俊铏熺浉浣嶅湪涓€鍊嬬⒓鍏冩湡闁撳収(n猫i)婧�(zh菙n)纰虹殑绶氭€ц畩鍖栫偤卤蟺/2锛�

(4)鍦ㄤ竴鍊嬬⒓鍏冩湡闁�锛屼俊铏熸噳(y墨ng)鍖呮嫭1/4杓夋尝鍛ㄦ湡鐨勬暣鏁�(sh霉)鍊�锛�

(5)鍦ㄧ⒓鍏冭綁(zhu菐n)鎻涙檪鍒讳俊铏熺殑鐩镐綅鏄€ｇ簩(x霉)鐨�(娌掓湁璺宠畩)锛�

(6)鍔熺巼鏅痪闄嶉€熷害蹇�锛屽付澶栬蓟灏勮純灏�銆�

浠ヤ腑蹇冭級闋荤偤63.75MHz锛岀⒓閫熺巼鐐�5Mb/s鐨凪SK瑾�(di脿o)鍒朵俊铏熺偤渚嬶細

(1)鍏╁€嬭級闋籪1=62.5MHz锛宖2=65MHz锛屽叾瑾�(di脿o)鍒舵寚鏁�(sh霉)h=(65-62.5)MHz=2.5MHz=1/2閫熺巼銆�

(2)鍦ㄤ竴鍊嬬⒓鐗囧懆鏈熷収(n猫i)(200ns)鎵€鍖呭惈鐨勪腑蹇冭級闋�63.75MHz鐨�1/4鍛ㄦ湡鍊嬫暩(sh霉)P锛�

P=0.2/(1/63.75)脳(1/4)=51锛屾槸鏁存暩(sh霉)锛屾豢瓒崇磩鏉熸浠�銆�

2.1.2AD9957娉㈠舰鍙冩暩(sh霉)鎺у埗鐢�(ch菐n)鐢烳SK瑾�(di脿o)鍒朵俊铏�

鍦ㄤ互涓績杓夐牷鐐�63.75MHz锛岀⒓閫熺巼鐐�5Mb/s鐨凪SK瑾�(di脿o)鍒朵俊铏熺郴绲�(t菕ng)涓紝AD9957鍙€氶亷鎺у埗鍏�(n猫i)閮ㄥ瘎瀛樺櫒浠ラ枊闂�(gu膩n)鍒囨彌鐨勬柟寮忓(sh铆)鐝�(xi脿n)涓婅堪娉㈠舰鐨勭敘(ch菐n)鐢�锛屾祦绋嬪涓嬶細

(1)鍏�(n猫i)鏍告檪閻樼殑鐢�(ch菐n)鐢�

AD9957鐨勫収(n猫i)鏍告檪閻樻棦鍙互鐩存帴杓稿叆楂橀牷鏅傞悩锛屼篃鍙互閫氶亷鍏�(n猫i)閮ㄥ€嶉牷鍣ㄥ皣澶栭儴鏅傞悩鍊嶉牷鐢�(ch菐n)鐢燂紝鍏�(n猫i)閮ㄥ€嶉牷鍣ㄦ渶澶у€嶉牷鏁�(sh霉)鐐�127(7b)銆傞噰鐢ㄥ収(n猫i)閮ㄥ€嶉牷鏂瑰紡锛屾檪閻樻渶澶ц几鍏ラ牷鐜囩偤60MHz銆傝嫢閲囩敤40MHz澶栭儴鏅傞悩锛屽€嶉牷鍒�1GHz鍏�(n猫i)鏍告檪閻橈紝鍊嶉牷瀵勫瓨鍣ㄥ弮鏁�(sh霉)鎳�(y墨ng)瑷�(sh猫)瀹氱偤25銆�

鍦ㄥ(sh铆)闅涚殑宸ョ▼瀵�(sh铆)韪愪腑鐧�(f膩)鐝�(xi脿n)鐢ㄤ簬鐢�(ch菐n)鐢烝D9957楂橀牷鍏�(n猫i)鏍告檪閻樼殑閹栫浉鐠�(hu谩n)闆昏矾鎬ц兘杓冨樊锛屾渻褰遍熆绯荤当(t菕ng)淇¤櫉璩�(zh矛)閲�锛屽洜姝ら€氶亷澶栭儴楂橀牷鏅傞悩鐩存帴杓稿叆浣滅偤鍏�(n猫i)鏍告檪閻樻槸杓冨ソ鐨勮ō(sh猫)瑷�(j矛)鏂规銆�

(2)闋荤巼瑾�(di脿o)璜у瓧鐨勮▓(j矛)绠�

闋荤巼瑾�(di脿o)璜у瓧鏄疉D9957鍦ㄥ柈闊抽牷宸ヤ綔妯″紡涓嬶紝瀵�(sh铆)鐝�(xi脿n)淇¤櫉瑾�(di脿o)鍒剁殑閲嶈鍙冩暩(sh霉)銆傚皪浜庝腑蹇冭級闋荤偤63.75MHz锛岀⒓閫熺巼鐐�5Mb/s鐨凪SK瑾�(di脿o)鍒剁郴绲�(t菕ng)锛屽亣瀹欰D9957鐨勫収(n猫i)鏍告檪閻樼偤1GHz锛屽叾鍏╁€嬭級闋�62.5MHz鍜�65MHz鐨勯牷鐜囪(di脿o)璜у瓧(FTW)鍒嗗垾鐐猴細

(3)娉㈠舰鍙冩暩(sh霉)鐨勬敞鍏ヨ垏鎺у埗

閫氶亷SPI鏁�(sh霉)鎿�(j霉)绺界窔锛屽垎鍒ュ皣FTW1鍜孎TW2杓稿叆灏嶆噳(y墨ng)瀵勫瓨鍣≒ROFILE0鍜孭ROFILE1銆傜郴绲�(t菕ng)宸ヤ綔鏂瑰紡瑷�(sh猫)缃垚鍠煶闋绘ā寮�銆傚閮ㄤ俊鎭⒓鐗�(200ns)閫氶亷鎺у埗淇¤櫉绶歅ROFILE[2锛�0]鏁�(sh霉)鎿�(j霉)绶氫娇鍏剁媭鎱�(t脿i)鍦�0锛�1(PROFILE1锛�2鏅傞悩鐐�0)璁婂寲锛屽緸鑰屽(sh铆)鐝�(xi脿n)杓夋尝62.5MHz鍜�65MHz鐨勫(sh铆)鏅傚垏鎻涚敘(ch菐n)鐢烳SK瑾�(di脿o)鍒朵俊铏熴€傚湪鑴堟矕绯荤当(t菕ng)涓篃鍙互閫氶亷灏囨煇涓€鍊婸ROFILE瀵勫瓨鍣ㄧ殑骞呭害鍙冩暩(sh霉)缃偤0锛屼締瀵�(sh铆)鐝�(xi脿n)鑴堟矕鐧�(f膩)灏�銆傚悓妯ｉ€欐ǎ鐨勮剤娌栫郴绲�(t菕ng)涔熷彲浠ラ噰鐢∕SK鏂瑰紡瀵�(sh铆)鐝�(xi脿n)銆傞€氶亷娉㈠舰鍙冩暩(sh霉)鏂瑰紡鐢�(ch菐n)鐢烳SK瑾�(di脿o)鍒朵俊铏熸槸AD9957绨″柈鍙潬鐨勮(di脿o)鍒舵尝褰㈢敓鎴愭柟娉�锛岄€氶亷閫欑ó鏂规硶鍚屾ǎ涔熷彲浠ュ(sh铆)鐝�(xi脿n)BPSK锛孮PSK瑾�(di脿o)鐩镐俊铏�锛屽彧涓嶉亷PRO-FILE鎺у埗鐨勫弮鏁�(sh霉)鐢遍牷鐜囪畩鎴愪簡鐩镐綅銆備絾鍦ㄥ柈闊抽牷宸ヤ綔鏂瑰紡涓嬮€氶亷娉㈠舰鍙冩暩(sh霉)鎺у埗鏂瑰紡杓冮洠瀵�(sh铆)鐝�(xi脿n)灏嶅熀甯剁⒓娴佺殑鎴愬舰婵炬尝锛屼俊铏熺殑闋昏瓬鐗规€х浉灏嶈純宸�銆�

3.绲�(ji茅)璜�

閫氶亷鐞嗚珫鍒嗘瀽鍜屽伐绋嬪(sh铆)韪�锛屽彲浠ュ緱鍑哄涓嬬祼(ji茅)璜栵細AD9957鏄竴娆炬€ц兘杓冨ソ鐨勬暩(sh霉)瀛椾笂璁婇牷鍣�锛屼互瑭茶姱鐗囨(g貌u)寤虹殑杓夋尝瑾�(di脿o)鍒跺櫒鍏锋湁瑾�(di脿o)鍒惰几鍑轰俊铏熻唱(zh矛)閲忛珮銆侀浕璺姛鑰椾綆銆佽ō(sh猫)瑷�(j矛)绨″柈銆佹噳(y墨ng)鐢ㄥ唬娉涚瓑鍎�(y艒u)榛�(di菐n)锛屾槸闄嶄綆鍚勯楂橀€熻粺浠剁劇绶氶€氫俊绯荤当(t菕ng)鐨勮(di脿o)鍒惰ō(sh猫)鍌欒ō(sh猫)瑷�(j矛)闆ｅ害浠ュ強鎻愰珮绯荤当(t菕ng)鎬ц兘鎸囨(bi膩o)鐨勭悊鎯虫暩(sh霉)瀛楀寲鍣ㄤ欢銆�