{"id":1088,"date":"2025-01-16T14:38:53","date_gmt":"2025-01-16T06:38:53","guid":{"rendered":"https:\/\/dt9025a.top\/?p=1088"},"modified":"2025-01-16T14:38:53","modified_gmt":"2025-01-16T06:38:53","slug":"psr-%e4%b8%8e-psrr","status":"publish","type":"post","link":"https:\/\/dt9025a.top\/?p=1088","title":{"rendered":"PSR \u4e0e PSRR"},"content":{"rendered":"\n<p>PSRR\uff08Power Supply Rejection Ratio\uff09\u662f\u4e00\u4e2a\u8868\u5f81\u7535\u8def\u5bf9\u8f93\u5165\u4fe1\u53f7\u4e2d\u5305\u542b\u7684\u6270\u52a8\uff08\u7eb9\u6ce2\uff09\u7684\u6291\u5236\u80fd\u529b\u7684\u6307\u6807\u3002\u901a\u5e38\uff0cPSRR \u662f\u4e00\u4e2a\u6b63\u6570\u7684 dB \u503c\uff0c\u8868\u793a\u901a\u8fc7\u8be5\u7535\u8def\u7684\u6270\u52a8\uff08\u7eb9\u6ce2\uff09\u51cf\u5c0f\u4e86 PSRR dB\u3002<\/p>\n\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\">\u8fd0\u653e\u4e2d\u7684 PSRR<\/h2>\n\n\n\n<p>\u4f9d\u636e Razavi \u5bf9\u8fd0\u653e\u4e2d PSRR \u7684\u5b9a\u4e49\uff08\u4ece\u8f93\u5165\u5230\u8f93\u51fa\u7684\u589e\u76ca\u9664\u4ee5\u4ece\u7535\u6e90\u5230\u8f93\u51fa\u7684\u589e\u76ca\uff09\uff0c\u8fd0\u653e\u4e2d PSRR \u7684\u8868\u793a\u4e3a\uff1a<\/p>\n\n\n\n$$\nPSRR=20lg\\frac{A_V}{A_{DD}}\n$$\n\n\n\n<p>\u5176\u4e2d\uff0c<\/p>\n\n\n\n\\begin{align}\nA_V &#038; = \\frac{V_o}{V_i}|_{v_{dd} = 0} (\u7535\u6e90\u4e0a\u65e0\u4ea4\u6d41\u5c0f\u4fe1\u53f7\uff0c\u5373\u4e3a\u6b63\u5e38\u7684\u589e\u76ca) \\\\\nA_{DD} &#038;= \\frac{V_o}{V_i}|_{v_{i} = 0} (\u8f93\u5165\u65e0\u4ea4\u6d41\u5c0f\u4fe1\u53f7\uff0c\u5373\u4e3a\u7535\u6e90\u4e0a\u7684\u5c0f\u4fe1\u53f7\u5230\u8f93\u51fa\u7684\u589e\u76ca)\n\\end{align}\n\n\n\n<h2 class=\"wp-block-heading\">LDO \u4e2d\u7684 PSR \/ PSRR<\/h2>\n\n\n\n<p>\u4f9d\u636e <a href=\"https:\/\/www.ti.com\/lit\/an\/slaa414a\/slaa414a.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">TI &#8211; LDO PSRR Measurement Simplified<\/a> \u4e2d\u7684\u5b9a\u4e49\uff0cLDO \u4e2d PSRR \u7684\u8868\u793a\u4e3a\uff1a<\/p>\n\n\n\n$$\nPSRR=20lg\\frac{V_{ripple,in}}{V_{ripple,out}} \n$$\n\n\n\n<p>\u540c\u65f6\uff0c\u4e5f\u6709\u5c06 PSR\uff08Power Supply Rejection\uff09\u8868\u793a\u4e3a\u4e0b\u5f0f\u7684\u5b58\u5728\uff1a<\/p>\n\n\n\n$$\nPSR=20lg\\frac{V_{ripple,out}}{V_{ripple,in}}=-PSRR \n$$\n","protected":false},"excerpt":{"rendered":"<p>PSRR\uff08Power Supply Rejection Ratio\uff09\u662f\u4e00\u4e2a\u8868\u5f81\u7535\u8def\u5bf9\u8f93\u5165\u4fe1\u53f7\u4e2d\u5305\u542b\u7684\u6270\u52a8\uff08\u7eb9\u6ce2&#8230; <\/p>\n<div class=\"read-more navbutton\"><a href=\"https:\/\/dt9025a.top\/?p=1088\">\u9605\u8bfb\u66f4\u591a<i class=\"fa fa-angle-double-right\"><\/i><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-1088","post","type-post","status-publish","format-standard","hentry","category-ic-design"],"_links":{"self":[{"href":"https:\/\/dt9025a.top\/index.php?rest_route=\/wp\/v2\/posts\/1088","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dt9025a.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dt9025a.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dt9025a.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dt9025a.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1088"}],"version-history":[{"count":0,"href":"https:\/\/dt9025a.top\/index.php?rest_route=\/wp\/v2\/posts\/1088\/revisions"}],"wp:attachment":[{"href":"https:\/\/dt9025a.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1088"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dt9025a.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1088"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dt9025a.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}