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Electronic circuits and components * Course Index * Introduction * About the Author * About this Course * Feedback * Course Navigation * How to use this Course * TINA * Locktronics Fundamentals * Introduction: Fundamentals * Units and Multiples * Electricity * Electronic Principles * Electrical Circuits * Alternating Current * Assessment: Fundamentals Passive Components * Introduction: Passive Components * Resistors * Capacitors * Inductors * Transformers * Batteries, Fuses, Lamps and Switches * Assessment: Passive Components Semiconductors * Introduction: Semiconductors * Diodes * Transistors * Logic Gates * Assessment: Semiconductors Passive Circuits * Introduction: Passive Circuits * Series and Parallel Connections * Kirchoff's Laws * Potential and Current Dividers * Passive Time Variant Circuits * Assessment: Passive Circuits Active Circuits * Introduction: Active Circuits * Power Supply Circuits * Operational Amplifier Circuits ## Symbols and Signal Connections ## Power Supply Connections ## Dual Supply Configurations ## Voltage Gain ## Worksheet: Voltage Gain ## Input Resistance ## Output Resistance ## Input Offset Voltage ## Inverting Amplifier ## Worksheet: Inverting Amplifier ## Non-inverting Amplifier ## Worksheet: Non-inverting Amplifier ## Differential Amplifier ## Worksheet: Differential Amplifier ## Direct Coupled Amplifier ## Worksheet: Direct Coupled Amplifier * Transistor Amplifier Circuits * 555 Timer Circuits * Assessment: Active Circuits Parts Gallery * Introduction: Parts Gallery * Passive Component Images * Semiconductor Images * Other Images * Quizzes |
(:Summary:Contains the 'action' links (like Browse, Edit, History, etc.), placed at the top of the page, see site page actions:) (:comment This page can be somewhat complex to figure out the first time you see it. Its contents are documented at PmWiki.SitePageActions if you need help. :) * Print (:comment (:if group Site,SiteAdmin,Cookbook,Profiles,PmWiki*:) (:comment delete if and ifend to enable backlinks:) * %item rel=nofollow class=backlinks accesskey='$[ak_backlinks]'% [[{*$Name}?action=search&q=link={*$FullName} | $[Backlinks] ]] (:ifend:) :) * Login Input Resistance<^< Worksheet: Voltage Gain | Course Index | Output Resistance >^>(:nl:)  The input resistance of an operational amplifier is defined as the ratio of input voltage to input current expressed in ohms. It is often expedient to assume that the input of an operational amplifier is purely resistive though this is not the case at high frequencies where shunt capacitive reactance may become significant. The input resistance of operational amplifiers is very much dependent on the semiconductor technology employed. In practice values range from about 2 MΩ for common bipolar types to over 10'^12^'Ω for FET and CMOS devices. Input resistance is the ratio of input voltage to input current: R'_IN_' = V'_IN_'/I'_IN_' where R'_IN_' is the input resistance (in Ω), V'_IN_' is the input voltage (in V) and I'_IN_' is the input current (in A). (:nl:)(:table style="clear:both":)
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