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	<title>Mastering Electronics Design&#187; common-mode</title>
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	<link>http://masteringelectronicsdesign.com</link>
	<description>Electronics Design and Modeling with Emphasis on Analog Design</description>
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		<title>Differential Amplifier Output Common-Mode Voltage Calculator</title>
		<link>http://masteringelectronicsdesign.com/differential-amplifier-output-common-mode-voltage-calculator/</link>
		<comments>http://masteringelectronicsdesign.com/differential-amplifier-output-common-mode-voltage-calculator/#comments</comments>
		<pubDate>Sun, 28 Feb 2010 23:47:20 +0000</pubDate>
		<dc:creator>Adrian S. Nastase</dc:creator>
				<category><![CDATA[Analog Design]]></category>
		<category><![CDATA[Calculators]]></category>
		<category><![CDATA[Differential Amplifier]]></category>
		<category><![CDATA[amplifier]]></category>
		<category><![CDATA[calculator]]></category>
		<category><![CDATA[common-mode]]></category>
		<category><![CDATA[op amp]]></category>
		<category><![CDATA[operational amplifier]]></category>

		<guid isPermaLink="false">http://masteringelectronicsdesign.com/?p=1314</guid>
		<description><![CDATA[A differential amplifier frequent use is the amplification of the voltage difference between its input signals, while rejecting the common-mode level.  However, the output common-mode level cannot be zero.  The operational amplifier technological limitations, as well as the outside resistor tolerances let the common-mode voltage to make it to the amplifier output as an output error.  As a consequence, the amplifier output voltage is the input signal difference times gain, plus the output common-mode voltage.

Based on the resistor tolerances, this calculator will show the output common-mode voltage, Vocm, and the total voltage, Vout, at the differential amplifier output.  Vocm will alter the ideal output voltage, which can be calculated when the resistors are perfectly matched.


Related posts:<ol><li><a href='http://masteringelectronicsdesign.com/the-differential-amplifier-common-mode-error-part-1/' rel='bookmark' title='Permanent Link: The Differential Amplifier Common-Mode Error – Part 1'>The Differential Amplifier Common-Mode Error – Part 1</a></li><li><a href='http://masteringelectronicsdesign.com/the-differential-amplifier-common-mode-error-part-2/' rel='bookmark' title='Permanent Link: The Differential Amplifier Common-Mode Error – Part 2'>The Differential Amplifier Common-Mode Error – Part 2</a></li><li><a href='http://masteringelectronicsdesign.com/differential-amplifier-calculator-2/' rel='bookmark' title='Permanent Link: Differential Amplifier Calculator'>Differential Amplifier Calculator</a></li></ol>]]></description>
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		<title>The Differential Amplifier Common-Mode Error – Part 2</title>
		<link>http://masteringelectronicsdesign.com/the-differential-amplifier-common-mode-error-part-2/</link>
		<comments>http://masteringelectronicsdesign.com/the-differential-amplifier-common-mode-error-part-2/#comments</comments>
		<pubDate>Mon, 08 Jun 2009 01:24:55 +0000</pubDate>
		<dc:creator>Adrian S. Nastase</dc:creator>
				<category><![CDATA[Analog Design]]></category>
		<category><![CDATA[Differential Amplifier]]></category>
		<category><![CDATA[Power Supply]]></category>
		<category><![CDATA[amplifier]]></category>
		<category><![CDATA[common-mode]]></category>
		<category><![CDATA[operational amplifier]]></category>

		<guid isPermaLink="false">http://masteringelectronicsdesign.com/?p=300</guid>
		<description><![CDATA[When designing a differential amplifier, part of the art is to manage the errors affecting the precision of the circuit.  In The Differential Amplifier Common-Mode Error - Part 1 of this presentation I discussed the common-mode error of a differential amplifier.  I also showed that, given the circuit in Figure 1, the common-mode voltage can be viewed as V2, when we consider V1-V2 as a signal that rides on top of V2.  The same goes for V1, which can be considered the common-mode voltage of the differential amplifier when -(V1-V2) is the signal that rides on top of V1.


Related posts:<ol><li><a href='http://masteringelectronicsdesign.com/the-differential-amplifier-common-mode-error-part-1/' rel='bookmark' title='Permanent Link: The Differential Amplifier Common-Mode Error – Part 1'>The Differential Amplifier Common-Mode Error – Part 1</a></li><li><a href='http://masteringelectronicsdesign.com/differential-amplifier-output-common-mode-voltage-calculator/' rel='bookmark' title='Permanent Link: Differential Amplifier Output Common-Mode Voltage Calculator'>Differential Amplifier Output Common-Mode Voltage Calculator</a></li><li><a href='http://masteringelectronicsdesign.com/solving-the-differential-amplifier-part-3/' rel='bookmark' title='Permanent Link: Solving the Differential Amplifier &#8211; Part 3'>Solving the Differential Amplifier &#8211; Part 3</a></li></ol>]]></description>
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		<slash:comments>5</slash:comments>
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		<title>The Differential Amplifier Common-Mode Error – Part 1</title>
		<link>http://masteringelectronicsdesign.com/the-differential-amplifier-common-mode-error-part-1/</link>
		<comments>http://masteringelectronicsdesign.com/the-differential-amplifier-common-mode-error-part-1/#comments</comments>
		<pubDate>Thu, 21 May 2009 03:13:56 +0000</pubDate>
		<dc:creator>Adrian S. Nastase</dc:creator>
				<category><![CDATA[Analog Design]]></category>
		<category><![CDATA[Differential Amplifier]]></category>
		<category><![CDATA[Superposition Theorem]]></category>
		<category><![CDATA[amplifier]]></category>
		<category><![CDATA[common mode rejection]]></category>
		<category><![CDATA[common mode rejection ratio]]></category>
		<category><![CDATA[common-mode]]></category>
		<category><![CDATA[operational amplifier]]></category>

		<guid isPermaLink="false">http://masteringelectronicsdesign.com/?p=219</guid>
		<description><![CDATA[The common-mode voltage can bring errors in the differential amplifier applications.  What is the common-mode voltage?  The common-mode voltage is the voltage level common to both inverting and non-inverting inputs of the differential amplifier.  In many applications, the differential amplifier is used to amplify the difference between two voltages, for later processing, or to isolate a signal from common-mode noise, or to amplify a signal that rides on top of some large voltage level.  If the common-mode voltage is not rejected, it appears as an error at the amplifier output.


Related posts:<ol><li><a href='http://masteringelectronicsdesign.com/the-differential-amplifier-common-mode-error-part-2/' rel='bookmark' title='Permanent Link: The Differential Amplifier Common-Mode Error – Part 2'>The Differential Amplifier Common-Mode Error – Part 2</a></li><li><a href='http://masteringelectronicsdesign.com/differential-amplifier-output-common-mode-voltage-calculator/' rel='bookmark' title='Permanent Link: Differential Amplifier Output Common-Mode Voltage Calculator'>Differential Amplifier Output Common-Mode Voltage Calculator</a></li><li><a href='http://masteringelectronicsdesign.com/solving-the-differential-amplifier-part-1/' rel='bookmark' title='Permanent Link: Solving the Differential Amplifier &#8211; Part 1'>Solving the Differential Amplifier &#8211; Part 1</a></li></ol>]]></description>
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		<slash:comments>4</slash:comments>
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