{"id":215,"date":"2017-01-08T17:25:12","date_gmt":"2017-01-08T15:25:12","guid":{"rendered":"http:\/\/lz2jr.com\/blog\/?p=215"},"modified":"2019-02-22T14:00:05","modified_gmt":"2019-02-22T12:00:05","slug":"mosfet-linear-power-amplifier-50-watts","status":"publish","type":"post","link":"https:\/\/lz2jr.com\/blog\/index.php\/mosfet-linear-power-amplifier-50-watts\/","title":{"rendered":"MOSFET LINEAR POWER AMPLIFIER 50 WATTS"},"content":{"rendered":"<p>Final 50W amplifier is designed using 4pcs. QFET N-MOS <a href=\"https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/FQP13N10.pdf\"><strong>FAIRCHILD FQP13N10<\/strong><\/a> transistor. The module consist of three stages: predriver with NXP PD85004, driver in push-pull configuration (2xPD85004) and final unit utilizing 4pcs. (2 by 2 push-pull in parallel) FQP13N10 transistors in easy to mount TO-220 case.<\/p>\n<p>Main reason we chose such a general purpose switching MOSFET&#8217;s is that they are cheap and is in current production so can be delivered anytime from a trusty supplier.<\/p>\n<p>Input matching and especially Ciss (~400pF) compensation is performed by input transformer TR2, inductors L3, L7, L8, L9, swamp resistors R7, R16, R26, R39. This group of components increases input drive signal for frequencies over 10MHz and swamps input energy for low frequencies where the overall gain is more than sufficient.<\/p>\n<p><a class=\"highslide img_1\" href=\"https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W-15100109.png\" onclick=\"return hs.expand(this)\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-398\" src=\"https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W-15100109-300x212.png\" alt=\"\" width=\"300\" height=\"212\" srcset=\"https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W-15100109-300x212.png 300w, https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W-15100109-768x543.png 768w, https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W-15100109-1024x724.png 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Bias voltage for all transistors is provided by voltage regulator 78L05 (U1) and MPSA13 (T11) which is in good contact with final transistor heatsink in order to perform needed temperature compensation.<br \/>\nIn order to minimize voltage drop power supply input and current sensor are also on this board &#8211; C58,C59, D1, ZXCT1081E5<\/p>\n<p>PCB component side:<br \/>\n<a class=\"highslide img_2\" href=\"https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W.png\" onclick=\"return hs.expand(this)\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-399\" src=\"https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W-300x123.png\" alt=\"\" width=\"300\" height=\"123\" srcset=\"https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W-300x123.png 300w, https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W-768x314.png 768w, https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W-1024x419.png 1024w, https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W.png 1833w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>PCB component side (references)<\/p>\n<p><a class=\"highslide img_3\" href=\"https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W2.png\" onclick=\"return hs.expand(this)\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-400\" src=\"https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W2-300x125.png\" alt=\"\" width=\"300\" height=\"125\" srcset=\"https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W2-300x125.png 300w, https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W2-768x321.png 768w, https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W2-1024x428.png 1024w, https:\/\/lz2jr.com\/blog\/wp-content\/uploads\/2017\/01\/PA55W2.png 1848w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Final 50W amplifier is designed using 4pcs. QFET N-MOS FAIRCHILD FQP13N10 transistor. The module consist of three stages: predriver with NXP PD85004, driver in push-pull configuration (2xPD85004) and final unit utilizing 4pcs. (2 by 2 push-pull in parallel) FQP13N10 transistors<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[13,18],"tags":[],"class_list":["post-215","post","type-post","status-publish","format-standard","hentry","category-hf-home-made-transceiver","category-linear-amplifier-50w"],"_links":{"self":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/215","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=215"}],"version-history":[{"count":10,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/215\/revisions"}],"predecessor-version":[{"id":404,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/posts\/215\/revisions\/404"}],"wp:attachment":[{"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=215"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=215"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lz2jr.com\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}