{"id":51,"date":"2005-05-09T17:25:54","date_gmt":"2005-05-09T09:25:54","guid":{"rendered":"http:\/\/192.168.0.1\/blog_4.4.2\/?p=51"},"modified":"2005-05-09T17:25:54","modified_gmt":"2005-05-09T09:25:54","slug":"opllphase-lock-loop","status":"publish","type":"post","link":"https:\/\/blog.worren.net\/?p=51","title":{"rendered":"\u4f55\u8b02PLL(Phase Lock Loop)?"},"content":{"rendered":"<div class='drop-case'> <p> PLL, \u9396\u76f8\u8ff4\u8def. \u89e3\u91cb\u540d\u8fad\u5982\u4e0b :<\/div>\n <p> \u4f86\u6e90 :http:\/\/tw.knowledge.yahoo.com\/question\/?qid=1004121400812 <br \/> \n <!--more--> \n <p> PLL\u539f\u7406 \n <p> \u65b0\u4e00\u4ee3\u6642\u8108\u7522\u751f\u5668\u67b6\u69cb\u4e2d\u6700\u4e3b\u8981\u7684\u6838\u5fc3\uff0c\u5c11\u4e0d\u4e86\u76f8\u4f4d\u9396\u5b9a\u8ff4\u8def\u3008Phase Locked Loop\uff0cPLL\u3009\u9019\u500b\u90e8\u5206\u3002\u9396\u76f8\u8ff4\u8def\u767c\u5c55\u81f3\u4eca\u5df2\u6709\u5e7e\u5341\u5e74\u7684\u6b77\u53f2\u4e86\uff0c\u5927\u90e8\u5206\u7528\u4f86\u4f5c\u70ba\u5c0d\u6642\u8108\u6216\u983b\u7387\u7684\u7cbe\u78ba\u63a7\u5236\uff0c\u8209\u51e1\u96fb\u8996\u6536\u97f3\u6a5f\u7b49\u7121\u7dda\u96fb\u6ce2\u7684\u983b\u7387\u8abf\u8ae7\u6216\u662fCD\u8207PC\u7b49\u6578\u4f4d\u7522\u54c1\u7684\u6642\u8108\u63a7\u5236\u7684\u5834\u5408\uff0c\u7686\u53ef\u4f7f\u7528PLL\u4f86\u8a2d\u8a08\u983b\u7387\u63a7\u5236\u8ff4\u8def\uff0c\u4ee5\u7c21\u5316\u96fb\u8def\u7684\u8907\u96dc\u5ea6\uff0c\u589e\u52a0\u7cbe\u78ba\u6027\u3002 <br \/> \n(\u57161. PLL\u7684\u57fa\u672c\u67b6\u69cb\uff0c\u8acb\u8a73\u898b\u5143\u4ef6\u79d1\u6280\u96dc\u8a8c\u5341\u4e00\u6708\u865f\u5167\u6587) <br \/> \nPLL\u7684\u4e3b\u8981\u539f\u7406\uff0c\u57fa\u672c\u662f\u4e00\u7a2e\u985e\u4f3c\u904b\u7b97\u653e\u5927\u5668\u822c\u7684\u8ca0\u56de\u6388\u96fb\u5b50\u96fb\u8def\u7d50\u69cb\uff0c\u5982\u57161\u6240\u793a\uff0cPLL\u4e3b\u8981\u6709\u5169\u500b\u8f38\u5165\u7aef\uff0c\u5206\u5225\u662f\u3008\u53c3\u8003\u8f38\u5165\u983b\u7387\u76ea\u6676\u9ad4\u4f5c\u70ba\u57fa\u6e96\u53c3\u8003\uff0c\u8207\u3008\u56de\u994b\u8f38\u5165\u983b\u7387\uff0cFvco\u3009\uff0c\u5171\u540c\u9023\u63a5\u5230PLL\u5167\u90e8\u7684\u7b2c\u4e00\u500b\u5143\u4ef6\u3008\u76f8\u4f4d\/\u983b\u7387\u6aa2\u77e5\u5668\uff0cPhase\/Frequency Detector\uff0cPFD\u3009\u3002\u76f8\u4f4d\/\u983b\u7387\u5075\u6e2c\u5668\u6703\u6bd4\u8f03\u53c3\u8003\u983b\u7387\u8207\u56de\u994b\u983b\u7387\u5169\u8005\u9593\u7684\u5dee\u5225\uff0c\u6aa2\u6e2c\u51fa\u5169\u8005\u9593\u7684\u76f8\u4f4d\u8207\u983b\u7387\u7684\u5dee\u7570\u91cf\uff0c\u7576\u53c3\u8003\u983b\u7387\u9ad8\u65bc\u56de\u994b\u983b\u7387\u6642\uff0cPFD Up\u7aef\u6703\u8f38\u51faUp\u8108\u6ce2;\u53cd\u4e4b\u82e5\u662f\u53c3\u8003\u983b\u7387\u4f4e\u65bc\u56de\u994b\u983b\u7387\u6642\uff0cPFD Dn\u7aef\u6703\u8f38\u51faDn\u8108\u6ce2\u3002\u76f8\u4f4d\/\u983b\u7387\u5075\u6e2c\u5668\u7522\u751f\u7684\u8108\u6ce2\u4fe1\u865f\u96a8\u5f8c\u7d93\u7531\u3008\u96fb\u6d41\u63a7\u5236\u5668\uff0cCharge Pump\u3009\u8207\u3008\u8ff4\u8def\u6ffe\u6ce2\u5668\uff0cLoop Filter\u3009\uff0c\u8f49\u63db\u6210\u70ba\u6700\u5f8c\u4e00\u968e\u3008\u96fb\u58d3\u63a7\u5236\u632f\u76ea\u5668\uff0cVoltage Controled Oscillator VCO\u3009\u7684\u63a7\u5236\u96fb\u58d3\uff0c\u7522\u751fFvco\u6642\u8108\u8a0a\u865f\u7684\u8f38\u51fa\u3002 <br \/> \n\u6b64\u6642\u82e5\u662f\u8f38\u51fa\u7684\u6642\u8108\u8a0a\u865f\u76f4\u63a5\u9023\u63a5\u7684\u8ca0\u56de\u6388\u983b\u7387\u8f38\u5165\u7aef\uff0c\u5c31\u5f62\u6210\u4e86\u6240\u8b02\u7684\u300c\u76f8\u4f4d\u9396\u5b9a\u8ff4\u8def\u300d\uff0c\u8f38\u51fa\u7aef\u6240\u9001\u51fa\u7684\u56de\u994b\u8f38\u5165\u983b\u7387(Fvco)\u7684\u6642\u8108\u8a0a\u865f\u5c07\u6703\u88ab\u7528\u4f86\u9396\u5b9a\u53c3\u8003\u8f38\u5165\u983b\u7387(Fref)\uff0c\u6c38\u9060\u8207\u53c3\u8003\u983b\u7387\u540c\u6b65\u4fdd\u6301\u4e00\u81f4\u7684\u76f8\u4f4d\u8207\u983b\u7387\u72c0\u614b\u3002\u7576\u56de\u994b\u8f38\u5165\u983b\u7387(Fvco)\u8207\u53c3\u8003\u8f38\u5165\u983b\u7387(Fref)\u7684\u983b\u7387\u8207\u76f8\u4f4d\u4e00\u81f4\u6642\u4e5f\u5c31\u662f\u6574\u500b\u76f8\u4f4d\u8ff4\u8def\u5df2\u7d93\u9396\u5b9a\u4e86(Locked)\u3002 <br \/> \n\u6642\u8108\u7522\u751f\u5668\u85c9\u8457PLL\u7684\u76f8\u4f4d\u9396\u5b9a\u7279\u6027\uff0c\u65bcPLL\u7684\u5169\u500b\u8f38\u5165\u7aef\u8207\u8f38\u51fa\u7aef\uff0c\u82e5\u5c07\u53c3\u8003\u8f38\u5165\u983b\u7387(Fref)\u8207\u56de\u994b\u8f38\u5165\u983b\u7387(Fvco)\u4e4b\u5f8c\u5206\u5225\u63a5\u4e0a\u9664\u983b\u96fb\u8def\uff0c\u5982\u4e0a\u5716\u4e2d\u7684P\u3001Q\u3001R\u3002\u7576PLL\u8655\u65bc\u7a69\u5b9a\u9396\u5b9a\u7684\u72c0\u614b\u6642\uff0cPFD\u7684\u5169\u7684\u8f38\u5165\u7aef\u983b\u7387\u8207\u76f8\u4f4d\u61c9\u70ba\u76f8\u7b49\uff0c\u6545 <br \/> \nFref \/ Q = Fvco \/P <br \/> \n\u6240\u4ee5 <br \/> \nFvco = Fref * P \/ Q <br \/> \n\u56e0\u70ba\u5be6\u969b\u7684\u8f38\u51fa\u7aef\u9084\u6709\u4e00\u500b\u9664\u983b\u96fb\u8defR\uff0c\u6240\u4ee5\u6642\u8108\u7522\u751f\u5668\u7684\u8f38\u51fa\u983b\u7387\u5c31\u6703\u8b8a\u6210 <br \/> \nFout = ( Fref * P ) \/ ( Q * R ) <br \/> \n\u6578\u4f4d\u96fb\u8def\u7684\u8a2d\u8a08\u5de5\u7a0b\u5e2b\u5011\uff0c\u85c9\u7531\u6539\u8b8a\u6642\u8108\u7522\u751f\u5668\u4e2d\u9664\u983b\u96fb\u8def\u7684\u53c3\u6578\u642d\u914d\uff0c\u8b8a\u52d5P\uff0cQ\uff0cR\u4e4b\u9593\u7684\u6bd4\u7387\uff0c\u4fbf\u53ef\u4ee5\u5f88\u5bb9\u6613\u7684\u7531\u4e00\u500b\u57fa\u6e96\u7684\u53c3\u8003\u983b\u7387\u8a0a\u865f\u6e90\uff0c\u7522\u751f\u51fa\u96fb\u8def\u4e2d\u6240\u9700\u8981\u7684\u5404\u7a2e\u983b\u7387\u6642\u8108\u8a0a\u865f\u3002 <br \/> \nPLL\u5728\u6642\u8108\u96fb\u8def\u4e2d\uff0c\u9664\u4e86\u61c9\u7528\u5728\u6642\u8108\u7522\u751f\u5668\u4e4b\u5916\uff0c\u9084\u53ef\u4ee5\u767c\u63ee\u5176\u76f8\u4f4d\u9396\u5b9a\u7684\u7279\u6027\uff0c\u9032\u800c\u5ef6\u4f38\u767c\u5c55\u51fa\u5404\u7a2e\u6642\u8108\u96fb\u8def\u76f8\u95dc\u7684\u61c9\u7528\u5143\u4ef6\u3002 \n","protected":false},"excerpt":{"rendered":" <p> PLL, \u9396\u76f8\u8ff4\u8def. \u89e3\u91cb\u540d\u8fad\u5982\u4e0b : \u4f86\u6e90 :http:\/\/tw.knowledge.yahoo.com\/question\/?qid=1004121400812 <\/p> \n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[7,1],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.worren.net\/index.php?rest_route=\/wp\/v2\/posts\/51"}],"collection":[{"href":"https:\/\/blog.worren.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.worren.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.worren.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.worren.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=51"}],"version-history":[{"count":0,"href":"https:\/\/blog.worren.net\/index.php?rest_route=\/wp\/v2\/posts\/51\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.worren.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=51"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.worren.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=51"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.worren.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=51"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}