The Science Forum - Scientific Discussion and Debate
		Live Chat    FAQ    Search    Usergroups
	Register  ::  Log in	Log in to check your private messages
	Science Forum Forum Index » Electronics » transistor  transistor « View previous topic :: View next topic »  Author Message avi108music Posted: Tue Jun 17, 2008 1:51 am    Post subject: transistor Forum Freshman Joined: 18 Jan 2008 Posts: 3 it's considered that the transistor is a 2 port device....i.e having i/p terminal and o/p terminals.......so can u tell why the input impedance in case of common base configuration 24.4ohm...why isn't it any other value?? Back to top Harold14370 Posted: Tue Jun 17, 2008 2:46 pm    Post subject: Re: transistor Forum Professor Joined: 13 Apr 2007 Posts: 1561 Location: Pennsylvania avi108music wrote: it's considered that the transistor is a 2 port device....i.e having i/p terminal and o/p terminals.......so can u tell why the input impedance in case of common base configuration 24.4ohm...why isn't it any other value?? According to this Wikipedia article on common base transistor circuit, the input resistance is 1/transconductance. http://en.wikipedia.org/wiki/Common_base According to this article on transconductance, it varies with the emitter current http://en.wikipedia.org/wiki/Transconductance#Field_effect_transistors In summary, I don't know why it would always be 24.4. Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First     Page 1 of 1 Science Forum Forum Index » Electronics » transistor Jump to: Select a forum Natural Sciences----------------Astronomy & CosmologyBiologyChemistryEarth SciencesMathematicsPhysics People----------------Behavioral & Social SciencesHealth & MedicinePhilosophical DiscussionHistoryReligionPoliticsCriminology and Forensic Science General Technology----------------Computer ScienceElectronicsMilitary Technology Information Technology----------------Business & EconomicsEducationEngineering & Transportation International Issues----------------Environmental IssuesIn the News The Science Forum----------------General DiscussionIntroductionsScience-Fiction and Non-FictionExperimentationPseudoscienceLinksArt and Culture Site Administration----------------Site FeedbackTrash Can  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
	Enter your search terms Submit search form   Web www.thescienceforum.com © 2004-2008 Thescienceforum.com Sponsored by EnluxLED Partner Forums Politics Forum  Radar Detector