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	<title>Mastering Electronics Design&#187; input resistance</title>
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	<description>Electronics Design and Modeling with Emphasis on Analog Design</description>
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		<title>The Common-Collector Amplifier Input and Output Resistance &#8211; The Proof</title>
		<link>http://MasteringElectronicsDesign.com/the-common-collector-amplifier-input-and-output-resistance/</link>
		<comments>http://MasteringElectronicsDesign.com/the-common-collector-amplifier-input-and-output-resistance/#comments</comments>
		<pubDate>Mon, 12 Oct 2009 07:15:02 +0000</pubDate>
		<dc:creator>Adrian S. Nastase</dc:creator>
				<category><![CDATA[Analog Design]]></category>
		<category><![CDATA[Thevenin's Theorem]]></category>
		<category><![CDATA[Transistor Circuits]]></category>
		<category><![CDATA[amplifier]]></category>
		<category><![CDATA[BJT]]></category>
		<category><![CDATA[common-collector]]></category>
		<category><![CDATA[dependent sources]]></category>
		<category><![CDATA[input resistance]]></category>
		<category><![CDATA[output resistance]]></category>
		<category><![CDATA[proof]]></category>
		<category><![CDATA[transistor]]></category>
		<category><![CDATA[voltage follower]]></category>

		<guid isPermaLink="false">http://masteringelectronicsdesign.com/?p=814</guid>
		<description><![CDATA[In this article I will show a method to deduce the input and output resistance of the common collector amplifier.  The common-collector amplifier is a well known circuit (see Figure 1).  It is mostly used as a buffer due to its high input resistance, small output resistance and unity gain buffer.  The equations derived in this article are symbolic, as is the derivation of any other formula in this website.  Still, even if the resistances’ values are not numeric, the equations are intuitive enough to show the high input low output resistance property of the amplifier.


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