{"id":9204,"date":"2024-06-15T16:00:20","date_gmt":"2024-06-15T08:00:20","guid":{"rendered":"https:\/\/uetpcb.com\/?p=9204"},"modified":"2024-06-26T16:37:06","modified_gmt":"2024-06-26T08:37:06","slug":"differences-between-vcc-vee-vdd-and-vss","status":"publish","type":"post","link":"https:\/\/uetpcb.com\/fr\/differences-between-vcc-vee-vdd-and-vss\/","title":{"rendered":"Diff\u00e9rences entre VCC, VEE, VDD et VSS"},"content":{"rendered":"<p><em>Consultez cet article pour conna\u00eetre les diff\u00e9rences essentielles entre VCC, VEE, VDD et VSS. D\u00e9couvrez l'origine de ces termes et leurs applications dans l'\u00e9lectronique pratique. <\/em><\/p>\n<h2><span style=\"color: #008000;\">Introduction<\/span><\/h2>\n<p>Il est tr\u00e8s probable que vous ayez rencontr\u00e9 l'un des termes VCC, VEE, VDD ou VSS dans votre vie quotidienne avec l'\u00e9lectronique.<\/p>\n<p>Ces symboles ont pu repr\u00e9senter les sources d'alimentation de vos circuits \u00e9lectroniques ou IC.<\/p>\n<p>Cependant, vous \u00eates-vous interrog\u00e9 sur la signification de chaque personnage sp\u00e9cifique dans ces symboles ?<\/p>\n<p>Vous apprendrez tout cela ici. Vous apprendrez \u00e9galement quelques applications pratiques de ces termes dans vos sch\u00e9mas.<\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"color: #008000;\">Qu'est-ce que le CCV sous sa forme compl\u00e8te en \u00e9lectronique ?<\/span><\/h2>\n<p>Les concepteurs utilisent g\u00e9n\u00e9ralement VCC dans les circuits classiques avec un transistor \u00e0 jonction bipolaire (BJT).<\/p>\n<p>Un BJT est un dispositif utilis\u00e9 pour amplifier ou contr\u00f4ler un signal \u00e9lectrique. Il s'agit principalement d'un dispositif contr\u00f4l\u00e9 par le courant.<\/p>\n<p>Comme vous le verrez ci-dessous, un BJT est un composant \u00e0 trois bornes dont les broches sont le collecteur (C), l'\u00e9metteur (E) et la base (B).<\/p>\n<p>La particularit\u00e9 des BJT est qu'ils doivent \u00eatre polaris\u00e9s pour fonctionner correctement. En g\u00e9n\u00e9ral, la configuration typique d'un BJT est la configuration \u00e0 \u00e9metteur commun.<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-9208\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VCC_in_full_form_in_Electronics-204x300.webp\" alt=\"Qu&#039;est-ce que le CCV dans la forme compl\u00e8te en \u00e9lectronique ?\" width=\"635\" height=\"934\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VCC_in_full_form_in_Electronics-204x300.webp 204w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VCC_in_full_form_in_Electronics-8x12.webp 8w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VCC_in_full_form_in_Electronics.webp 314w\" sizes=\"(max-width: 635px) 100vw, 635px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>En regardant de pr\u00e8s le circuit, on peut voir que sa source d'alimentation est VCC. On pense que, traditionnellement, le terme VCC vient du fait que cette source fournit la tension du collecteur ou VC.<\/p>\n<p>La double notation CC distingue VCC (l'alimentation du collecteur du transistor) de VC (la tension au niveau de la broche du collecteur).<\/p>\n<p>&nbsp;<\/p>\n<p>Cependant, vous verrez \u00e9galement le symbole VCC li\u00e9 aux broches d'alimentation de certains circuits int\u00e9gr\u00e9s, en particulier les circuits classiques.<\/p>\n<p>Ces puces font appel \u00e0 une technologie de fabrication ancienne (mais \u00e9prouv\u00e9e) utilisant des BJT.<\/p>\n<p>Vous trouverez ci-dessous un exemple d'amplificateur op\u00e9rationnel UA 741 de National Semiconductor.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-9205\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VCC_in_full_form_in_Electronics-300x111.webp\" alt=\"VCC_in_full_form_in_Electronics\" width=\"684\" height=\"253\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VCC_in_full_form_in_Electronics-300x111.webp 300w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VCC_in_full_form_in_Electronics-768x283.webp 768w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VCC_in_full_form_in_Electronics-18x7.webp 18w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VCC_in_full_form_in_Electronics.webp 821w\" sizes=\"(max-width: 684px) 100vw, 684px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>La construction interne de ce circuit int\u00e9gr\u00e9 est principalement compos\u00e9e de BJT. La broche VCC est principalement connect\u00e9e pour alimenter les broches collectrices des transistors dans le circuit.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-9213\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_VCC_in_full_form_in_Electronics-300x270.webp\" alt=\"Quelle_VCC_en_forme_compl\u00e8te_en_\u00e9lectronique\" width=\"664\" height=\"598\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_VCC_in_full_form_in_Electronics-300x270.webp 300w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_VCC_in_full_form_in_Electronics-13x12.webp 13w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_VCC_in_full_form_in_Electronics.webp 576w\" sizes=\"(max-width: 664px) 100vw, 664px\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"color: #008000;\">Qu'est-ce que la forme compl\u00e8te de VEE en \u00e9lectronique ?<\/span><\/h2>\n<p>Comme VCC, VEE provient d'une autre broche du BJT appel\u00e9e \u00e9metteur. La tension sur la broche de l'\u00e9metteur est VE ou tension de l'\u00e9metteur.<\/p>\n<p>C'est ainsi qu'est n\u00e9 le terme VEE, qui alimente ou met \u00e0 la terre la broche \u00e9mettrice, pour le diff\u00e9rencier de VE.<\/p>\n<p>En g\u00e9n\u00e9ral, les ing\u00e9nieurs charg\u00e9s de la conception des circuits consid\u00e8rent que VEE est \u00e9gal \u00e0 la masse dans une configuration de base \u00e0 \u00e9metteur commun.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-9211\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_in_Electronics-192x300.webp\" alt=\"Qu&#039;est-ce que le VEE en \u00e9lectronique ?\" width=\"562\" height=\"878\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_in_Electronics-192x300.webp 192w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_in_Electronics-8x12.webp 8w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_in_Electronics.webp 282w\" sizes=\"(max-width: 562px) 100vw, 562px\" \/><\/p>\n<p>Cependant, il existe diff\u00e9rents types de configurations pour l'\u00e9metteur commun. L'une de ces configurations est un circuit \u00e0 \u00e9metteur stabilis\u00e9.<\/p>\n<p>Un tel circuit comporte une r\u00e9sistance connect\u00e9e entre la broche \u00e9mettrice et la masse ; ainsi, VEE et GND sont in\u00e9gaux dans ce circuit.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-9207\" style=\"font-size: 14.4px;\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VEE_in_full_form_in_Electronics-164x300.webp\" alt=\"VEE_en_forme_compl\u00e8te_en_\u00e9lectronique\" width=\"557\" height=\"1019\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VEE_in_full_form_in_Electronics-164x300.webp 164w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VEE_in_full_form_in_Electronics-7x12.webp 7w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VEE_in_full_form_in_Electronics.webp 258w\" sizes=\"(max-width: 557px) 100vw, 557px\" \/><\/p>\n<p>De m\u00eame que pour VCC, vous trouverez de nombreuses puces classiques avec le symbole VEE comme source d'alimentation.<\/p>\n<p>Ces puces sont g\u00e9n\u00e9ralement constitu\u00e9es de BJT en interne. En g\u00e9n\u00e9ral, les concepteurs connectent ces broches \u00e0 GND ou \u00e0 un potentiel n\u00e9gatif.<\/p>\n<p>Toutefois, certaines puces diff\u00e9rencient la borne VEE de la borne de masse en sp\u00e9cifiant que la broche VEE n\u00e9cessite une tension d'alimentation n\u00e9gative.<\/p>\n<p>Voici un exemple de puce appel\u00e9e circuit multiplexeur\/d\u00e9multiplexeur analogique CD74HC4051.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-9214\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_VEE_in_full_form_in_Electronics-300x130.webp\" alt=\"Quoi_VEE_en_forme_compl\u00e8te_en_\u00e9lectronique\" width=\"582\" height=\"252\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_VEE_in_full_form_in_Electronics-300x130.webp 300w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_VEE_in_full_form_in_Electronics-18x8.webp 18w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_VEE_in_full_form_in_Electronics.webp 496w\" sizes=\"(max-width: 582px) 100vw, 582px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-9210\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_in_Electronic-300x143.webp\" alt=\"Qu&#039;est-ce que le VEE dans sa forme compl\u00e8te dans l&#039;\u00e9lectronique ?\" width=\"1051\" height=\"501\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_in_Electronic-300x143.webp 300w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_in_Electronic-1030x492.webp 1030w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_in_Electronic-768x367.webp 768w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_in_Electronic-18x9.webp 18w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_in_Electronic.webp 1329w\" sizes=\"(max-width: 1051px) 100vw, 1051px\" \/><\/p>\n<p>Si vous n'avez qu'une seule source de tension d'alimentation et que vous n'avez pas besoin d'un potentiel n\u00e9gatif, vous devriez pouvoir connecter VEE et GND.<\/p>\n<h2><span style=\"color: #008000;\">Qu'est-ce que le VDD sous sa forme compl\u00e8te en \u00e9lectronique ?<\/span><\/h2>\n<p>Si VCC est n\u00e9 des circuits BJT, le terme VDD provient des circuits FET (ou Field Effect Transistor).<\/p>\n<p>Comme les BJT, les concepteurs utilisent principalement les FET pour amplifier ou contr\u00f4ler un signal \u00e9lectrique. Les FET sont des composants \u00e0 trois bornes : D pour Drain, G pour Porte et S pour Source.<\/p>\n<p>Contrairement aux BJT, les FET sont principalement des dispositifs contr\u00f4l\u00e9s par la tension. Les FETS ont \u00e9galement des imp\u00e9dances d'entr\u00e9e plus \u00e9lev\u00e9es que leurs homologues BJT.<\/p>\n<p>&nbsp;<\/p>\n<p>Vous trouverez ci-dessous un circuit simple de FET (plus pr\u00e9cis\u00e9ment de type MOSFET). En regardant de pr\u00e8s, on peut voir que sa source d'alimentation est VDD, qui alimente la broche de drain.<\/p>\n<p>On pense que, traditionnellement, le terme VDD vient du fait que cette source fournit la tension de drain ou VD.<\/p>\n<p>La notation double DD distingue VDD (la source d'alimentation du drain du transistor) de VD (la tension \u00e0 la broche du drain).<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-9209\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_Electronics-240x300.webp\" alt=\"Qu&#039;est-ce que l&#039;\u00e9lectronique ?\" width=\"670\" height=\"838\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_Electronics-240x300.webp 240w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_Electronics-10x12.webp 10w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VEE_in_full_form_Electronics.webp 260w\" sizes=\"(max-width: 670px) 100vw, 670px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>En outre, vous verrez le symbole VDD reli\u00e9 aux broches d'alimentation de certains circuits int\u00e9gr\u00e9s, en particulier les plus r\u00e9cents.<\/p>\n<p>Ces puces font appel \u00e0 une technologie de fabrication plus efficace utilisant des transistors \u00e0 effet de champ (FET). Les circuits int\u00e9gr\u00e9s fabriqu\u00e9s avec des FET sont plus stables en temp\u00e9rature, ont une plus grande densit\u00e9 de transistors et sont plus faciles \u00e0 fabriquer.<\/p>\n<p>Vous trouverez ci-dessous un exemple de puce, un microcontr\u00f4leur appel\u00e9 PIC16F877A de Microchip Technology, qui utilise des techniques de fabrication FET.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-9206\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VEE_in_full_form_in_Electronic-300x253.webp\" alt=\"\" width=\"668\" height=\"563\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VEE_in_full_form_in_Electronic-300x253.webp 300w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VEE_in_full_form_in_Electronic-14x12.webp 14w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/VEE_in_full_form_in_Electronic.webp 621w\" sizes=\"(max-width: 668px) 100vw, 668px\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"color: #008000;\">Qu'est-ce que le VSS sous sa forme compl\u00e8te en \u00e9lectronique ?<\/span><\/h2>\n<p>Comme VDD, VSS provient d'une autre broche du dispositif FET appel\u00e9e source. La tension sur cette broche source est appel\u00e9e VS, ou tension de source.<\/p>\n<p>VSS alimente ou met \u00e0 la terre cette broche source. Le double SS sur le terme VSS diff\u00e9rencie l'alimentation VSS de VS ou de la tension source.<\/p>\n<p>Notez que VSS peut \u00eatre \u00e9gal \u00e0 la masse dans une configuration FET \u00e0 canal N de base.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-9216\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/Whatis_VSS_in_full_form_in_Electronics-251x300.webp\" alt=\"Qu&#039;est-ce que le VSS_en_forme_compl\u00e8te_en_\u00e9lectronique ?\" width=\"570\" height=\"681\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/Whatis_VSS_in_full_form_in_Electronics-251x300.webp 251w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/Whatis_VSS_in_full_form_in_Electronics-10x12.webp 10w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/Whatis_VSS_in_full_form_in_Electronics.webp 266w\" sizes=\"(max-width: 570px) 100vw, 570px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>De m\u00eame que pour VDD, de nombreuses puces modernes utilisent le symbole VSS comme source d'alimentation. Les concepteurs de circuits connectent g\u00e9n\u00e9ralement ces broches \u00e0 GND ou \u00e0 un potentiel n\u00e9gatif.<\/p>\n<p>Comme nous l'avons vu plus haut \u00e0 propos du terme VDD, ces puces sont g\u00e9n\u00e9ralement construites en interne \u00e0 partir de la technologie FET moderne.<\/p>\n<p>&nbsp;<\/p>\n<p>L'exemple de microcontr\u00f4leur PIC16F877A a pour broche de masse VSS, comme indiqu\u00e9 ci-dessous.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-9215\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/Whatis_VSS_in_full_form_in_Electronic-300x256.webp\" alt=\"Whatis_VSS_in_full_form_in_Electronic\" width=\"575\" height=\"491\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/Whatis_VSS_in_full_form_in_Electronic-300x256.webp 300w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/Whatis_VSS_in_full_form_in_Electronic-14x12.webp 14w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/Whatis_VSS_in_full_form_in_Electronic.webp 621w\" sizes=\"(max-width: 575px) 100vw, 575px\" \/><\/p>\n<p>L'utilisation de cette puce dans un circuit vous montrera les connexions entre VDD et VSS. Ci-dessous, le circuit applique +5V \u00e0 VDD, qui alimente les broches VDD du MCU.<\/p>\n<p>Le circuit fournit aux broches VSS du MCU une masse ou un potentiel z\u00e9ro. Cet exemple de circuit fait clignoter une LED \u00e0 l'aide d'un microcontr\u00f4leur.<\/p>\n<p>Un micrologiciel est \u00e9galement grav\u00e9 dans le MCU pour accomplir cette t\u00e2che. Notez que le potentiel de masse du circuit est li\u00e9 \u00e0 VSS.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-9212\" src=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VSS_in_full_form_in_Electronics-300x238.webp\" alt=\"Qu&#039;est-ce que le VSS dans la forme compl\u00e8te en \u00e9lectronique ?\" width=\"615\" height=\"488\" srcset=\"https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VSS_in_full_form_in_Electronics-300x238.webp 300w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VSS_in_full_form_in_Electronics-1030x816.webp 1030w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VSS_in_full_form_in_Electronics-768x609.webp 768w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VSS_in_full_form_in_Electronics-15x12.webp 15w, https:\/\/uetpcb.com\/wp-content\/uploads\/2024\/06\/What_is_VSS_in_full_form_in_Electronics.webp 1224w\" sizes=\"(max-width: 615px) 100vw, 615px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"color: #008000;\">Conclusion<\/span><\/h2>\n<p>Vous avez appris les termes VCC, VDD, VEE et VSS. Il s'agit principalement de broches d'alimentation qui alimentent un circuit \u00e9lectronique ou une puce.<\/p>\n<p>VCC est d\u00e9riv\u00e9 de la tension de collecteur d'un BJT, VDD de la tension de drain d'un FET, VEE de la tension d'\u00e9metteur d'un BJT et VSS de la tension de source d'un FET.<\/p>\n<p>N'oubliez pas non plus que, bien que les broches VEE et VSS soient g\u00e9n\u00e9ralement reli\u00e9es \u00e0 la terre, elles peuvent \u00e9galement avoir un potentiel n\u00e9gatif en fonction de l'application de vos circuits.<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Consultez cet article pour d\u00e9couvrir les diff\u00e9rences essentielles entre VCC, VEE, VDD et VSS. D\u00e9couvrez l'origine de ces termes et leurs applications concr\u00e8tes en \u00e9lectronique. Introduction Vous avez tr\u00e8s certainement d\u00e9j\u00e0 rencontr\u00e9 l\u2019un des termes VCC, VEE, VDD ou VSS dans votre pratique quotidienne de l\u2019\u00e9lectronique. Ces symboles ont peut-\u00eatre d\u00e9sign\u00e9 les sources d\u2019alimentation de votre\u2026<\/p>","protected":false},"author":6,"featured_media":9212,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-9204","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Differences Between VCC, VEE, VDD, and VSS<\/title>\n<meta name=\"description\" content=\"Check this article for the critical differences between VCC, VEE, VDD, and VSS. 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