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	<title>Mastering Electronics Design&#187; inverting summing amplifier</title>
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		<title>How to Derive the Transfer Function of the  Inverting Summing Amplifier</title>
		<link>http://MasteringElectronicsDesign.com/how-to-derive-the-transfer-function-of-the-inverting-summing-amplifier/</link>
		<comments>http://MasteringElectronicsDesign.com/how-to-derive-the-transfer-function-of-the-inverting-summing-amplifier/#comments</comments>
		<pubDate>Mon, 17 Aug 2009 04:53:56 +0000</pubDate>
		<dc:creator>Adrian S. Nastase</dc:creator>
				<category><![CDATA[Analog Design]]></category>
		<category><![CDATA[Operational Amplifier Formulas]]></category>
		<category><![CDATA[Summing Amplifier]]></category>
		<category><![CDATA[Superposition Theorem]]></category>
		<category><![CDATA[inverting summing amplifier]]></category>
		<category><![CDATA[operational amplifier]]></category>
		<category><![CDATA[proof]]></category>

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		<description><![CDATA[The inverting summing amplifier does exactly what its name says: adds the input signals and inverts the result.  This amplifier presents a major advantage versus the non-inverting summing amplifier.  The input signals are added with their own gain.  The disadvantage is the inversion of the sum, which might not be desirable in some cases.  How can we derive this function?  What is the transfer function of the inverting summing amplifier with 3, 4, or n inputs?  This article answers all these questions.


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