{"id":12626,"date":"2024-03-21T09:55:31","date_gmt":"2024-03-21T09:55:31","guid":{"rendered":"https:\/\/chipedge.com\/?p=12626"},"modified":"2025-07-23T10:01:42","modified_gmt":"2025-07-23T10:01:42","slug":"what-is-the-antenna-effect-in-vlsi","status":"publish","type":"post","link":"https:\/\/chipedge.com\/resources\/what-is-the-antenna-effect-in-vlsi\/","title":{"rendered":"What Is The Antenna Effect in VLSI?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">The most sensitive component of a Metal Oxide Semiconductor (MOS) transistor is the gate oxide. During the construction of an Application Specific Integrated Circuit (ASIC), special care must be taken to safeguard it from damage both throughout the fabrication process and during the functioning of the ASIC. Some unwanted impacts can arise throughout an actual manufacturing process. The antenna effect in the <\/span><a href=\"https:\/\/chipedge.com\/best-vlsi-training-institute-in-bangalore\/\"><span style=\"font-weight: 400;\">VLSI design course<\/span><\/a><span style=\"font-weight: 400;\">, also known as plasma-induced gate-oxide damage or plasma-induced damage, occurs when unwanted charges accumulate on exposed conductors during certain fabrication processes, like plasma etching. These changes can then discharge through the thin gate of the oxide layer of transistors, potentially damaging them and impacting circuit performance or reliability.<\/span><\/p>\n<h1><span style=\"font-weight: 400;\">Factors that Contribute to Antenna Effect<\/span><\/h1>\n<p><span style=\"font-weight: 400;\">It is a phenomenon that can result in yield and reliability issues when MOS integrated circuits are manufactured.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">What is The Reason Behind The Antenna Effect in VLSI?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">If a conducting material or wire is linked to the device&#8217;s gate, the wire acts as an antenna, inducing a considerable amount of charge, and diodes produced by drain and source diffusion layers can conduct a significant amount of current. Finally, the antenna effect causes gate failure or I-V characteristics to deteriorate.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Changing threshold voltage, lower device life expectancy, and increased gate leakage are some of the issues that might arise due to the antenna effect.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Antenna guidelines have been established to prevent the concerns mentioned above<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">One solution is to split the wire into two sections and link the wire and a gate to the buffer layer.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Another option is to attach the diode to the wire and establish a discharge path during the etching process.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The word \u2018Antenna Effect\u2019 might seem misleading at first for electromagnetic radiation or transmitter-receiver systems, however, this is not the case. As a result, it has another common name: &#8220;Plasma-Induced Gate Oxide Damage,&#8221; which accurately describes the impact. This is a result induced by Gate Oxide Damage generated by the plasma etching process during the production of VLSI devices.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">When and How Does It Occur?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Although the antenna effect in the <\/span><a href=\"https:\/\/chipedge.com\/steps-in-vlsi-physical-design-flow\/\"><span style=\"font-weight: 400;\">VLSI physical design<\/span><\/a><span style=\"font-weight: 400;\"> occurs during the chip fabrication process, particularly during plasma etching, the avoidance mechanism should be established from the physical design stage. During the physical signoff step, the fabrication laboratory produces the antenna rule file, which must be examined and cleaned according to the antenna rule.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The fabrication flow begins with the fabrication of the FEOL (Front End Of Line), which includes the manufacture of all MOS transistors. BEOL (Back End Of Line) manufacturing begins after the FEOL fabrication is completed, which comprises the manufacture of metal interconnects. During BEOL manufacture, the antenna effect enters the picture.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Plasma etching is used to produce metal interconnects in the IC manufacturing process. Plasma etching is a selective etching method that is dry and anisotropic. During the etching process of metals, plasma comprises high-energy ions and radicals, which are gathered by metal interconnects.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">What is The Consequence of the Antenna Effect and Its Solutions?<\/span><\/h2>\n<h3><b>Antenna Violation<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Antenna Violation<\/span><span style=\"font-weight: 400;\"> occurs when the antenna ratio exceeds a value specified in a Process Design Kit (PDK). The antenna ratio is the ratio of the gate area to the gate oxide area. The amount of charge collection is determined by the area\/size of the conductor (gate area).<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Antenna Violation Solutions<\/span><\/h3>\n<h4><span style=\"font-weight: 400;\">Metal Jumpers<\/span><\/h4>\n<p><span style=\"font-weight: 400;\">Break signal lines and use jumpers to route them to the top metal layers. The lengthy wire connecting the gate and route to the higher metal layer is broken when a jumper is inserted. As a result, it grows shorter and less capable of charging. If an antenna violation occurs on a metal layer, use upper metal layers as a metal jumper because all of the lower levels have previously been produced.<\/span><\/p>\n<h4><b>Diode Insertion<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/h4>\n<p><span style=\"font-weight: 400;\">Connecting reverse-biased diodes near the gate input when a net is violated gives a discharge channel to the substrate, saving the transistor&#8217;s gate. The addition of a diode increases the area as well as the capacitance, resulting in a delay increase.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In Conclusion, the circumstances that lead to the development of the antenna effect in VLSI, are defined empirically for each procedure and are dependent on the technology employed to create the chip. Once they&#8217;ve been determined, they can be used to create a set of antenna rules that can be programmed, similar to traditional DRC rules.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Learn more about antenna effect in detail by registering for online VLSI courses on Chipedge which is the best VLSI training institute in India for online VLSI training. There are several online VLSI courses on this website for starting a successful career in the VLSI industry. This VLSI training institute offers various VLSI courses like <\/span><a href=\"https:\/\/chipedge.com\/physical-design-online-course\/\"><span style=\"font-weight: 400;\">physical design course<\/span><\/a><span style=\"font-weight: 400;\">, Design Verification in VLSI, ASIC verification courses, DFT course , chip design course, and many more. Register yourself in ChipEdge the best <\/span><a href=\"https:\/\/chipedge.com\/best-vlsi-training-institute-in-bangalore\/\"><span style=\"font-weight: 400;\">VLSI training institute in Bangalore<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The most sensitive component of a Metal Oxide Semiconductor (MOS) transistor is the gate oxide. During the construction of an [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":25565,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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