{"id":359,"date":"2017-12-20T01:43:05","date_gmt":"2017-12-20T01:43:05","guid":{"rendered":""},"modified":"2017-12-20T09:43:19","modified_gmt":"2017-12-20T01:43:19","slug":"%e5%9c%ba%e6%95%88%e5%ba%94%e7%ae%a1%e6%94%be%e5%a4%a7%e7%94%b5%e8%b7%af%e7%89%b9%e7%82%b9","status":"publish","type":"post","link":"http:\/\/www.szryc.com\/?p=359","title":{"rendered":"\u573a\u6548\u5e94\u7ba1\u653e\u5927\u7535\u8def\u7279\u70b9"},"content":{"rendered":"

\n\t\u3000\u573a\u6548\u5e94\u7ba1\u653e\u5927\u7535\u8def<\/strong><\/h2>\n

\n\t\u3000\u3000\u5bf9\u5e94\u4e09\u6781\u7ba1\u7684\u5171\u5c04\u3001\u5171\u96c6\u53ca\u5171\u57fa\u653e\u5927\u7535\u8def\uff0c\u573a\u6548\u5e94\u7ba1\u653e\u5927\u7535\u8def\u4e5f\u6709\u5171\u6e90\u3001\u5171\u6f0f\u548c\u5171\u6805\u4e09\u79cd\u57fa\u672c\u7ec4\u6001\u3002\u4e0b\u9762\u4ee5JFET\u7ec4\u6210\u7684\u5171\u6e90\u6781\u653e\u5927\u7535\u8def\u4e3a\u4f8b\uff0c\u4ecb\u7ecd\u573a\u6548\u5e94\u7ba1\u653e\u5927\u7535\u8def\u7684\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n

\n\t\u3000\u30001.\u81ea\u504f\u538b\u7535\u8def<\/strong><\/h3>\n

\n\t\u3000\u3000\u81ea\u504f\u538b\u7535\u8def\u5982\u56fe3-10\u6240\u793a\u3002\u5728\u56fe\u4e2d\uff0c\u573a\u6548\u5e94\u7ba1\u6805\u6781\u901a\u8fc7\u6805\u6781\u7535\u963bRG\u63a5\u5730\uff0c\u6e90\u6781\u901a\u8fc7\u6e90\u6781\u7535\u963bRS\u63a5\u5730\u3002\u8fd9\u79cd\u504f\u7f6e\u65b9\u5f0f\u5229\u7528JFET\uff08\u6216\u8017\u5c3d\u578bMOS\u7ba1\uff09\u5728\u6805\u6e90\u7535\u538buGS=0\u65f6\uff0c\u6f0f\u6781\u7535\u6d41iD≠0\u7684\u7279\u70b9\uff0c\u4ee5\u6f0f\u6781\u7535\u6d41\u5728\u6e90\u6781\u7535\u963bRS\u4e0a\u7684\u76f4\u6d41\u538b\u964d\uff0c\u7ed9\u6805\u6e90\u4e4b\u95f4\u63d0\u4f9b\u53cd\u5411\u504f\u7f6e\u7535\u538b\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u9759\u6001\u65f6\uff0c\u6e90\u6781\u7535\u4f4duS=iDRS\uff0c\u7531\u4e8e\u6805\u6781\u7535\u6d41\u4e3a0\uff0cRG\u4e0a\u6ca1\u6709\u538b\u964d\uff0c\u6805\u6781\u7535\u4f4duG=0\uff0c\u6240\u4ee5\u6805\u6e90\u4e4b\u95f4\u7684\u504f\u7f6e\u7535\u538b\u4e3a<\/p>\n

\n\t\u3000\u3000uGS=uG-uS=-iDRS<\/p>\n

\n\t\u3000\u3000\u8981\u8bf4\u660e\u7684\u662f\uff0c\u81ea\u504f\u538b\u65b9\u5f0f\u4e0d\u80fd\u7528\u4e8e\u7531\u589e\u5f3a\u578bMOS\u7ba1\u7ec4\u6210\u7684\u653e\u5927\u7535\u8def\u3002\u56e0\u4e3a\u589e\u5f3a\u578bMOS\u7ba1<\/p>\n

\n\t\u3000\u3000\u53ea\u6709\u5f53uGS\u8fbe\u5230UT\u65f6\u624d\u6709iD\u4ea7\u751f\u3002<\/p>\n

\n\t\"\u573a\u6548\u5e94\u7ba1\u653e\u5927\u7535\u8def\u7279\u70b9\"<\/p>\n

\n\t\u3000\u3000\u5bf9\u4e8e\u56fe3-10\u7535\u8def\u7684\u9759\u6001\u5de5\u4f5c\u70b9\uff0c\u53ef\u4ee5\u5229\u7528\u5f0f\uff083-1\uff09\u548c\u5f0f\uff083-3\uff09\u6c42\u8054\u7acb\u65b9\u7a0b\uff0c\u5373<\/p>\n

\n\t\u3000\u3000ID=IDSS\uff081-UGS\/UP\uff092\uff083-4<\/p>\n

\n\t\u3000\u3000\uff09UGS=-IDRS\uff083-5\uff09<\/p>\n

\n\t\u3000\u3000\u6c42\u5f97ID\u548cUGS\u4e4b\u540e\uff0c\u5219\u6709<\/p>\n

\n\t\u3000\u3000UDS=VDD-ID\uff08RD+RS\uff09\uff083-6\uff09<\/p>\n

\n\t\u3000\u3000\u4f8b3-1\u7535\u8def\u5982\u56fe3-10\u6240\u793a\uff0c\u5df2\u77e5IDSS=0.5mA\uff0cUP=-1V\uff0c\u8bd5\u786e\u5b9a\u7535\u8def\u7684\u9759\u6001\u5de5\u4f5c\u70b9\u3002<\/p>\n

\n\t\u3000\u3000\u89e3\uff1a\u6839\u636e\u4e0a\u9762\u5206\u6790\u5f97\u5230\u7684\u516c\u5f0f\u6709<\/p>\n

\n\t\u3000\u3000ID=0.5\uff081+UGS\uff092<\/p>\n

\n\t\u3000\u3000UGS=-2ID<\/p>\n

\n\t\u3000\u3000\u5c06UGS\u8868\u8fbe\u5f0f\u4ee3\u5165ID\u8868\u8fbe\u5f0f\u4e2d\uff0c\u5f97<\/p>\n

\n\t\u3000\u3000ID=0.5\uff081-2ID\uff092<\/p>\n

\n\t\u3000\u3000\u89e3\u65b9\u7a0b\u5f97<\/p>\n

\n\t\u3000\u3000ID=\uff080.75±0.56\uff09mA<\/p>\n

\n\t\u3000\u3000\u800cIDSS=0.5mA\uff0cID\u4e0d\u5e94\u5927\u4e8eIDSS\uff0c\u6240\u4ee5<\/p>\n

\n\t\u3000\u3000IDQ=0.19mA<\/p>\n

\n\t\u3000\u3000UGSQ=0.38V<\/p>\n

\n\t\u3000\u3000UDSQ=11.9<\/p>\n

\n\t\u3000\u30002.\u5206\u538b\u5f0f\u81ea\u504f\u538b\u7535\u8def<\/strong><\/h3>\n

\n\t\u3000\u3000\u867d\u7136\u81ea\u504f\u538b\u7535\u8def\u6bd4\u8f83\u7b80\u5355\uff0c\u4f46\u662f\u5f53\u9759\u6001\u5de5\u4f5c\u70b9\u786e\u5b9a\u540e\uff0cuGS\u548ciD\u5c31\u786e\u5b9a\u4e86\uff0c\u56e0\u800cRS\u9009\u62e9\u7684\u8303\u56f4\u5f88\u5c0f\u3002\u5206\u538b\u5f0f\u81ea\u504f\u538b\u7535\u8def\u662f\u5728\u56fe3-10\u7535\u8def\u7684\u57fa\u7840\u4e0a\u52a0\u63a5\u5206\u538b\u7535\u963b\u540e\u7ec4\u6210\u7684\uff0c\u5982\u56fe3-11\u6240\u793a\u3002\u6f0f\u6781\u7535\u6e90VDD\u7ecf\u5206\u538b\u7535\u963bRG1\u548cRG2\u5206\u538b\u540e\uff0c\u901a\u8fc7RG3\u4f9b\u7ed9\u6805\u6781\u7535\u538b\uff0cuG=RG2VDD\/\uff08RG1+RG2\uff09;\u540c\u65f6\u6f0f\u6781\u7535\u6d41\u5728\u6e90\u6781\u7535\u963bRS\u4e0a\u4e5f\u4ea7\u751f\u538b\u964d\uff0cuS=iDRS\u3002\u56e0\u6b64\uff0c\u9759\u6001\u65f6\u52a0\u5728JFET\u4e0a\u7684\u6805\u6e90\u7535\u538b\u4e3a<\/p>\n

\n\t <\/p>\n

\n\t\u3000\u3000uGS=uG-u<\/p>\n

\n\t\u3000\u3000=VDDRG2\/\uff08RG1+RG2\uff09-iDRS\uff083-7\uff09<\/p>\n

\n\t\u3000\u3000\u540c\u6837\u53ef\u6839\u636e\u5f0f\uff083-1\uff09\u548c\uff083-7\uff09\u6c42\u8054\u7acb\u65b9\u7a0b\uff0c\u5373<\/p>\n

\n\t\u3000\u3000ID=IDSS\uff081-UGS\/UP\uff092<\/p>\n

\n\t\u3000\u3000UGS=VDDRG2\/\uff08RG1+RG2\uff09-IDRS<\/p>\n

\n\t\u3000\u3000\u4ece\u800c\u6c42\u51faID\u548cUGS\uff0c\u5e76\u6c42\u51fa<\/p>\n

\n\t\u3000\u3000UDS=VDD-ID\uff08RD+RS\uff09<\/p>\n

\n\t\u3000\u3000\u5f97\u51fa\u7535\u8def\u7684\u9759\u6001\u5de5\u4f5c\u70b9\u3002<\/p>\n

\n\t\u3000\u30003\u3001\u573a\u6548\u5e94\u7ba1\u653e\u5927\u7535\u8def\u7684\u52a8\u6001\u5206\u6790<\/strong><\/h3>\n

\n\t\u3000\u3000\u56fe3-10\u81ea\u504f\u538b\u7535\u8def\u53ef\u4ee5\u7528\u56fe3-12\u7684\u4ea4\u6d41\u7b49\u6548\u7535\u8def\u6765\u8868\u793a\uff0c\u56fe\u4e2dRL\u4e3a\u653e\u5927\u7535\u8def\u5916\u52a0\u7684\u8d1f\u8f7d\u7535\u963b\u3002\u4ece\u56fe\u4e2d\u4e0d\u96be\u6c42\u51fa\u7535\u538b\u653e\u5927\u500d\u6570Au\u3001Ri\u548cRo\u4e09\u4e2a\u6027\u80fd\u53c2\u6570\u3002

\n\t\"\u573a\u6548\u5e94\u7ba1\u653e\u5927\u7535\u8def\u7279\u70b9\"<\/p>\n

\n\t\u3000\u30001.\u7535\u538b\u653e\u5927\u500d\u6570Au<\/p>\n

\n\t\u3000\u3000\u7531\u56fe3-12\u53ef\u5f97\u51fa<\/p>\n

\n\t\u3000\u3000Au=uo\/ui=\uff08-idR′L\uff09\/ugs=-\uff08gmugsR′L\uff09\/ugs<\/p>\n

\n\t\u3000\u3000\u5373<\/p>\n

\n\t\u3000\u3000Au=-gmR′L\uff083-8\uff09<\/p>\n

\n\t\u3000\u3000\u5176\u4e2d\uff0cR′L=RD\u2225RL\u3002<\/p>\n

\n\t\u3000\u3000\u5f0f\uff083-8\uff09\u8868\u660e\uff0cJFET\u5171\u6e90\u653e\u5927\u7535\u8def\u7684\u7535\u538b\u653e\u5927\u500d\u6570Au\u4e0e\u8de8\u5bfcgm\u6210\u6b63\u6bd4\uff0c\u4e14\u8f93\u51fa\u7535\u538b\u4e0e\u8f93\u5165\u7535\u538b\u53cd\u76f8\u3002<\/p>\n

\n\t\u3000\u30002.\u8f93\u5165\u7535\u963bRi\u548c\u8f93\u51fa\u7535\u963bRo<\/p>\n

\n\t <\/p>\n

\n\t\u3000\u3000\u7531\u56fe3-12\u53ef\u5f97<\/p>\n

\n\t\u3000\u3000Ri≈RG\uff083-9\uff09<\/p>\n

\n\t\u3000\u3000Ro≈RD\uff083-10\uff09<\/p>\n

\n\t\u3000\u3000\u53ef\u89c1\uff0c\u5171\u6e90\u653e\u5927\u7535\u8def\u7684\u8f93\u5165\u7535\u963bRi\u4e3b\u8981\u7531\u504f\u7f6e\u7535\u963bRG\u51b3\u5b9a\uff0c\u800c\u8f93\u51fa\u7535\u963bRo\u5219\u7531\u6f0f\u6781\u7535\u963bRD\u51b3\u5b9a\u3002<\/p>\n

\n\t\u3000\u3000\u573a\u6548\u5e94\u7ba1\u653e\u5927\u7535\u8def\u7684\u4f18\u7f3a\u70b9<\/strong><\/h2>\n

\n\t           \u4f18\u70b9<\/p>\n

\n\t\u3000\u3000\uff081\uff09\u8f93\u5165\u7535\u963b\u5927\u3002\u7528\u666e\u901a\u4e09\u6781\u7ba1\u505a\u6210\u653e\u5927\u7535\u8def\uff0c\u5171\u5c04\u7535\u8def\u7684\u8f93\u5165\u7535\u963b\u7ea6\u51e0KΩ\uff0c\uff08\u6211\u4eec\u4e00\u822c\u79f0\u4e4b\u4e3a10^3\u7ea7\uff09\uff0c\u5171\u96c6\u7535\u6781\u7535\u8def\u7684\u8f93\u5165\u7535\u963b\u4e5f\u53ea\u80fd\u505a\u5230\u51e0\u5341K\u6b27\u5230\u4e00\u767e\u591aK\u6b27\uff0810^5\u7ea7\uff09\uff0c\u800c\u4f7f\u7528\u7ed3\u578b\u573a\u6548\u5e94\u7ba1\uff08JFET\uff09\u5c31\u53ef\u505a\u5230\u8f93\u5165\u7535\u963b10^6\u7ea7\uff0c\u4f7f\u7528MOS\u7ba1\u80fd\u505a\u523010^8\u7ea7\u4ee5\u4e0a\u3002<\/p>\n

\n\t\u3000\u3000\uff082\uff09\u6e29\u5ea6\u7a33\u5b9a\u6027\u597d\uff0c\u7531\u4e8e\u573a\u6548\u5e94\u7ba1\u91cc\u6ca1\u6709\u6f02\u79fb\u7535\u6d41\uff0c\u57fa\u672c\u4e0d\u53d7\u6e29\u5ea6\u53d8\u5316\u7684\u5f71\u54cd\u3002<\/p>\n

\n\t\u3000\u3000\u7f3a\u70b9\uff1a<\/p>\n

\n\t\u3000\u3000\uff081\uff09\u653e\u5927\u500d\u6570\u5c0f\uff0c\u4e00\u7ea7\u653e\u5927\u53ea\u80fd\u505a\u5230\u51e0\u500d\uff08\u53ef\u80fd\u4e0d\u523010\u500d\uff09\uff0c\uff082\uff09\u8f93\u5165\u7aef\u7531\u4e8e\u9759\u7535\u611f\u5e94\u5bb9\u6613\u4ea7\u751f\u51fb\u7a7f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u573a\u6548\u5e94\u7ba1\u653e\u5927\u7535\u8def \u5bf9\u5e94\u4e09\u6781\u7ba1\u7684\u5171\u5c04\u3001\u5171\u96c6\u53ca\u5171\u57fa\u653e\u5927\u7535\u8def\uff0c\u573a\u6548\u5e94\u7ba1\u653e\u5927\u7535\u8def\u4e5f\u6709\u5171\u6e90\u3001\u5171\u6f0f\u548c\u5171\u6805\u4e09\u79cd\u57fa\u672c\u7ec4\u6001\u3002\u4e0b\u9762\u4ee5JFET\u7ec4\u6210\u7684\u5171\u6e90\u6781\u653e\u5927\u7535\u8def\u4e3a\u4f8b\uff0c\u4ecb\u7ecd\u573a\u6548\u5e94\u7ba1\u653e\u5927\u7535\u8def\u7684<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"_links":{"self":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/posts\/359"}],"collection":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=359"}],"version-history":[{"count":0,"href":"http:\/\/www.szryc.com\/index.php?rest_route=\/wp\/v2\/posts\/359\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=359"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=359"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.szryc.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=359"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}