{"id":206096,"date":"2025-03-26T14:26:21","date_gmt":"2025-03-26T14:26:21","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=206096"},"modified":"2025-03-26T14:26:21","modified_gmt":"2025-03-26T14:26:21","slug":"when-an-n-channel-d-mosfet-has-id","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/26\/when-an-n-channel-d-mosfet-has-id\/","title":{"rendered":"When an n-channel D-MOSFET has ID"},"content":{"rendered":"\n

When an n-channel D-MOSFET has ID . IDSS, it<\/p>\n\n\n\n

a. will be destroyed.<\/p>\n\n\n\n

b. is operating in the depletion mode.<\/p>\n\n\n\n

c. is forward-biased.<\/p>\n\n\n\n

d. is operating in the enhancement mode.<\/p>\n\n\n\n

The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n

The correct answer is:<\/p>\n\n\n\n

d. is operating in the enhancement mode.<\/strong><\/p>\n\n\n\n

Explanation:<\/h3>\n\n\n\n

An n-channel D-MOSFET (Depletion-type Metal-Oxide-Semiconductor Field-Effect Transistor) operates in two modes: depletion mode<\/strong> and enhancement mode<\/strong>. To understand the answer, let’s break down the conditions and modes:<\/p>\n\n\n\n

1. Depletion Mode (IDSS Condition):<\/strong><\/h4>\n\n\n\n
    \n
  • In depletion mode, the transistor can conduct current even when there is no gate-source voltage (V_GS = 0). The MOSFET is normally on, and the channel is pre-formed by the doping process.<\/li>\n\n\n\n
  • The current IDSS<\/strong> represents the maximum drain current in depletion mode when the gate-to-source voltage is zero (V_GS = 0). This is because the transistor, by default, has a conducting channel, and even without any gate bias, it can carry current.<\/li>\n\n\n\n
  • If the MOSFET’s drain current reaches IDSS<\/strong>, it is simply indicating that the transistor is operating at its maximum conduction level in depletion mode.<\/li>\n<\/ul>\n\n\n\n

    2. Enhancement Mode (ID > IDSS Condition):<\/strong><\/h4>\n\n\n\n
      \n
    • In enhancement mode, the channel is not pre-formed, and a voltage (V_GS) must be applied to enhance the conduction channel for current to flow.<\/li>\n\n\n\n
    • When the drain current (I_D) exceeds IDSS (i.e., ID > IDSS), the MOSFET is not in depletion mode anymore. Instead, it’s working in enhancement mode<\/strong>, where the gate voltage is positive enough to create a conducting channel (for an n-channel MOSFET).<\/li>\n<\/ul>\n\n\n\n

      Thus, when ID > IDSS<\/strong>, the MOSFET is in enhancement mode<\/strong> and behaves like a normally off device that gets turned on by the application of a positive gate-source voltage.<\/p>\n\n\n\n

      Additional Points:<\/h3>\n\n\n\n
        \n
      • Option a (will be destroyed)<\/strong> is incorrect because reaching IDSS<\/strong> in a depletion-mode MOSFET does not destroy it. This value represents the maximum current for normal operation.<\/li>\n\n\n\n
      • Option b (is operating in depletion mode)<\/strong> is incorrect when ID is greater than IDSS; it indicates that the MOSFET is in enhancement mode, not depletion.<\/li>\n\n\n\n
      • Option c (is forward-biased)<\/strong> is not necessarily true in this context. The MOSFET operates based on the gate-to-source voltage rather than just being forward-biased.<\/li>\n<\/ul>\n\n\n\n

        Image:<\/h3>\n\n\n\n

        Here’s an illustration showing the difference between depletion mode and enhancement mode in an n-channel MOSFET:<\/p>\n\n\n\n

        \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

        When an n-channel D-MOSFET has ID . IDSS, it a. will be destroyed. b. is operating in the depletion mode. c. is forward-biased. d. is operating in the enhancement mode. The correct answer and explanation is : The correct answer is: d. is operating in the enhancement mode. Explanation: An n-channel D-MOSFET (Depletion-type Metal-Oxide-Semiconductor Field-Effect […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"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":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-206096","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206096","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=206096"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206096\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=206096"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=206096"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=206096"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}