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	<title>Mastering Electronics Design&#187; Differential Amplifier</title>
	<atom:link href="http://masteringelectronicsdesign.com/category/differential-amplifier/feed/" rel="self" type="application/rss+xml" />
	<link>http://masteringelectronicsdesign.com</link>
	<description>Electronics Design and Modeling with Emphasis on Analog Design</description>
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		<title>A Summing and Differential Amplifier with One Op Amp</title>
		<link>http://masteringelectronicsdesign.com/a-summing-and-differential-amplifier-with-one-op-amp/</link>
		<comments>http://masteringelectronicsdesign.com/a-summing-and-differential-amplifier-with-one-op-amp/#comments</comments>
		<pubDate>Sun, 18 Apr 2010 01:27:36 +0000</pubDate>
		<dc:creator>Adrian S. Nastase</dc:creator>
				<category><![CDATA[Analog Design]]></category>
		<category><![CDATA[Differential Amplifier]]></category>
		<category><![CDATA[Summing amplifier]]></category>
		<category><![CDATA[Superposition Theorem]]></category>
		<category><![CDATA[amplifier]]></category>
		<category><![CDATA[inverting]]></category>

		<guid isPermaLink="false">http://masteringelectronicsdesign.com/?p=1366</guid>
		<description><![CDATA[In a comment, one of my readers asked me what is the transfer function of the non-inverting summing amplifier in Figure 1, when R3 is connected to a reference voltage instead of ground.  Well, this is a summing amplifier with a differential configuration. 


Related posts:<ol><li><a href='http://masteringelectronicsdesign.com/converting-a-differential-amplifier-into-a-summing-amplifier/' rel='bookmark' title='Permanent Link: Converting a Differential Amplifier into a Summing Amplifier'>Converting a Differential Amplifier into a Summing Amplifier</a></li><li><a href='http://masteringelectronicsdesign.com/the-differential-amplifier-transfer-function/' rel='bookmark' title='Permanent Link: How to Derive the Differential Amplifier Transfer Function'>How to Derive the Differential Amplifier Transfer Function</a></li><li><a href='http://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/' rel='bookmark' title='Permanent Link: How to Derive the Summing Amplifier Transfer Function'>How to Derive the Summing Amplifier Transfer Function</a></li></ol>]]></description>
		<wfw:commentRss>http://masteringelectronicsdesign.com/a-summing-and-differential-amplifier-with-one-op-amp/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<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>
		<wfw:commentRss>http://masteringelectronicsdesign.com/differential-amplifier-output-common-mode-voltage-calculator/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>How to Design a Circuit from its Transfer Function Graph</title>
		<link>http://masteringelectronicsdesign.com/how-to-design-a-circuit-from-its-transfer-function-graph/</link>
		<comments>http://masteringelectronicsdesign.com/how-to-design-a-circuit-from-its-transfer-function-graph/#comments</comments>
		<pubDate>Sun, 21 Feb 2010 02:53:23 +0000</pubDate>
		<dc:creator>Adrian S. Nastase</dc:creator>
				<category><![CDATA[Analog Design]]></category>
		<category><![CDATA[Differential Amplifier]]></category>
		<category><![CDATA[Electronic Circuits Examples]]></category>
		<category><![CDATA[amplifier]]></category>
		<category><![CDATA[differential amplifier formula]]></category>
		<category><![CDATA[op amp]]></category>
		<category><![CDATA[operational amplifier]]></category>
		<category><![CDATA[transfer function]]></category>

		<guid isPermaLink="false">http://masteringelectronicsdesign.com/?p=1297</guid>
		<description><![CDATA[Sometimes all we know about a circuit is its transfer function graph.  The transfer function might look like the one in Figure 1.  How can we design a circuit so that its input-output behavior will match the graph?


Related posts:<ol><li><a href='http://masteringelectronicsdesign.com/the-differential-amplifier-transfer-function/' rel='bookmark' title='Permanent Link: How to Derive the Differential Amplifier Transfer Function'>How to Derive the Differential Amplifier Transfer Function</a></li><li><a href='http://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/' rel='bookmark' title='Permanent Link: How to Derive the Summing Amplifier Transfer Function'>How to Derive the Summing Amplifier Transfer Function</a></li><li><a href='http://masteringelectronicsdesign.com/how-to-derive-the-instrumentation-amplifier-transfer-function/' rel='bookmark' title='Permanent Link: How to Derive the Instrumentation Amplifier Transfer Function'>How to Derive the Instrumentation Amplifier Transfer Function</a></li></ol>]]></description>
		<wfw:commentRss>http://masteringelectronicsdesign.com/how-to-design-a-circuit-from-its-transfer-function-graph/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Differential Amplifier Calculator</title>
		<link>http://masteringelectronicsdesign.com/differential-amplifier-calculator-2/</link>
		<comments>http://masteringelectronicsdesign.com/differential-amplifier-calculator-2/#comments</comments>
		<pubDate>Sun, 07 Feb 2010 01:58:59 +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[bipolar]]></category>
		<category><![CDATA[converter]]></category>
		<category><![CDATA[differential amplifier formula]]></category>
		<category><![CDATA[op amp]]></category>
		<category><![CDATA[op amp (opamp) formulas]]></category>
		<category><![CDATA[unipolar]]></category>

		<guid isPermaLink="false">http://masteringelectronicsdesign.com/?p=1287</guid>
		<description><![CDATA[If you need to design a differential amplifier, here is a handy calculator.  All you need to define are the input range, the output range and a choice of a voltage reference.  The default values for this calculator are set for a unipolar to bipolar converter.


Related posts:<ol><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/design-a-differential-amplifier-the-easy-way-with-mathcad/' rel='bookmark' title='Permanent Link: Design a Differential Amplifier the Easy Way with Mathcad'>Design a Differential Amplifier the Easy Way with Mathcad</a></li><li><a href='http://masteringelectronicsdesign.com/summing-amplifier-calculator-java/' rel='bookmark' title='Permanent Link: Summing Amplifier Calculator'>Summing Amplifier Calculator</a></li></ol>]]></description>
		<wfw:commentRss>http://masteringelectronicsdesign.com/differential-amplifier-calculator-2/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Design a Differential Amplifier the Easy Way with Mathcad</title>
		<link>http://masteringelectronicsdesign.com/design-a-differential-amplifier-the-easy-way-with-mathcad/</link>
		<comments>http://masteringelectronicsdesign.com/design-a-differential-amplifier-the-easy-way-with-mathcad/#comments</comments>
		<pubDate>Thu, 19 Nov 2009 07:47:30 +0000</pubDate>
		<dc:creator>Adrian S. Nastase</dc:creator>
				<category><![CDATA[Analog Design]]></category>
		<category><![CDATA[Differential Amplifier]]></category>
		<category><![CDATA[Electronic Circuits Examples]]></category>
		<category><![CDATA[amplifier]]></category>
		<category><![CDATA[bipolar]]></category>
		<category><![CDATA[converter]]></category>
		<category><![CDATA[op amp]]></category>
		<category><![CDATA[operational amplifier]]></category>
		<category><![CDATA[unipolar]]></category>

		<guid isPermaLink="false">http://masteringelectronicsdesign.com/?p=964</guid>
		<description><![CDATA[For those of you who have Mathcad, designing a differential amplifier is really easy.

Let’s say you need to design a unipolar to bipolar converter and you decide to use a differential amplifier for this task. You know the input and output voltage range and you need to calculate the resistors based on a voltage reference you have in the system. All you have to do is to create a Mathcad file for a quick response. Then store it some place for future designs.


Related posts:<ol><li><a href='http://masteringelectronicsdesign.com/design-bipolar-unipolar-converter-with-3-input-summ-amplifier/' rel='bookmark' title='Permanent Link: Design a Bipolar to Unipolar Converter with a 3-input Summing Amplifier'>Design a Bipolar to Unipolar Converter with a 3-input Summing Amplifier</a></li><li><a href='http://masteringelectronicsdesign.com/design-a-unipolar-to-bipolar-converter-for-a-unipolar-voltage-output-dac/' rel='bookmark' title='Permanent Link: Design a Unipolar to Bipolar Converter for a Unipolar Voltage Output DAC'>Design a Unipolar to Bipolar Converter for a Unipolar Voltage Output DAC</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>
		<wfw:commentRss>http://masteringelectronicsdesign.com/design-a-differential-amplifier-the-easy-way-with-mathcad/feed/</wfw:commentRss>
		<slash:comments>6</slash:comments>
		</item>
		<item>
		<title>Design a Unipolar to Bipolar Converter for a Unipolar Voltage Output DAC</title>
		<link>http://masteringelectronicsdesign.com/design-a-unipolar-to-bipolar-converter-for-a-unipolar-voltage-output-dac/</link>
		<comments>http://masteringelectronicsdesign.com/design-a-unipolar-to-bipolar-converter-for-a-unipolar-voltage-output-dac/#comments</comments>
		<pubDate>Mon, 02 Nov 2009 05:03:40 +0000</pubDate>
		<dc:creator>Adrian S. Nastase</dc:creator>
				<category><![CDATA[Analog Design]]></category>
		<category><![CDATA[Differential Amplifier]]></category>
		<category><![CDATA[Electronic Circuits Examples]]></category>
		<category><![CDATA[Mixed-Signal Design]]></category>
		<category><![CDATA[amplifier]]></category>
		<category><![CDATA[bipolar]]></category>
		<category><![CDATA[converter]]></category>
		<category><![CDATA[DAC]]></category>
		<category><![CDATA[digital to analog converters]]></category>
		<category><![CDATA[op amp]]></category>
		<category><![CDATA[operational amplifier]]></category>
		<category><![CDATA[unipolar]]></category>

		<guid isPermaLink="false">http://masteringelectronicsdesign.com/?p=944</guid>
		<description><![CDATA[Unipolar to bipolar converters are useful when we have to have a unipolar component to do a certain job in a mixed signal design environment.  For example, Digital to Analog Converters (DACs) may have the output voltage range 0 to 2.5 V, or 0 to 5 V, while the design asks for a range of –5 V to +5 V.  To comply with this requirement, we have to design a unipolar to bipolar converter which will be inserted between the DAC output and the following bipolar stage.


Related posts:<ol><li><a href='http://masteringelectronicsdesign.com/design-bipolar-unipolar-converter-with-3-input-summ-amplifier/' rel='bookmark' title='Permanent Link: Design a Bipolar to Unipolar Converter with a 3-input Summing Amplifier'>Design a Bipolar to Unipolar Converter with a 3-input Summing Amplifier</a></li><li><a href='http://masteringelectronicsdesign.com/design-a-bipolar-to-unipolar-converter/' rel='bookmark' title='Permanent Link: Design a Bipolar to Unipolar Converter to Drive an ADC'>Design a Bipolar to Unipolar Converter to Drive an ADC</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></ol>]]></description>
		<wfw:commentRss>http://masteringelectronicsdesign.com/design-a-unipolar-to-bipolar-converter-for-a-unipolar-voltage-output-dac/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>How to Derive the Instrumentation Amplifier Transfer Function</title>
		<link>http://masteringelectronicsdesign.com/how-to-derive-the-instrumentation-amplifier-transfer-function/</link>
		<comments>http://masteringelectronicsdesign.com/how-to-derive-the-instrumentation-amplifier-transfer-function/#comments</comments>
		<pubDate>Sun, 30 Aug 2009 23:31:22 +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[differential amplifier]]></category>
		<category><![CDATA[instrumentation amplifier]]></category>
		<category><![CDATA[op amp (opamp) formulas]]></category>
		<category><![CDATA[operational amplifier]]></category>
		<category><![CDATA[proof]]></category>
		<category><![CDATA[transfer function]]></category>

		<guid isPermaLink="false">http://masteringelectronicsdesign.com/?p=621</guid>
		<description><![CDATA[The Instrumentation Amplifier (IA) resembles the differential amplifier, with the main difference that the inputs are buffered by two Op Amps.  Besides that, it is designed for low DC offset, low offset drift with temperature, low input bias currents and high common-mode rejection ratio.  These qualities make the IA very useful in analog circuit design, in precision applications and in sensor signal processing.


Related posts:<ol><li><a href='http://masteringelectronicsdesign.com/the-differential-amplifier-transfer-function/' rel='bookmark' title='Permanent Link: How to Derive the Differential Amplifier Transfer Function'>How to Derive the Differential Amplifier Transfer Function</a></li><li><a href='http://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/' rel='bookmark' title='Permanent Link: How to Derive the Summing Amplifier Transfer Function'>How to Derive the Summing Amplifier Transfer Function</a></li><li><a href='http://masteringelectronicsdesign.com/how-to-derive-the-transfer-function-of-the-inverting-summing-amplifier/' rel='bookmark' title='Permanent Link: How to Derive the Transfer Function of the  Inverting Summing Amplifier'>How to Derive the Transfer Function of the  Inverting Summing Amplifier</a></li></ol>]]></description>
		<wfw:commentRss>http://masteringelectronicsdesign.com/how-to-derive-the-instrumentation-amplifier-transfer-function/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Differential Output Circuit</title>
		<link>http://masteringelectronicsdesign.com/differential-output-circuit/</link>
		<comments>http://masteringelectronicsdesign.com/differential-output-circuit/#comments</comments>
		<pubDate>Sun, 30 Aug 2009 06:54:18 +0000</pubDate>
		<dc:creator>Adrian S. Nastase</dc:creator>
				<category><![CDATA[Analog Design]]></category>
		<category><![CDATA[Differential Amplifier]]></category>
		<category><![CDATA[Electronic Circuits Examples]]></category>
		<category><![CDATA[Summing amplifier]]></category>
		<category><![CDATA[amplifier]]></category>
		<category><![CDATA[operational amplifier]]></category>
		<category><![CDATA[summing amplifier examples]]></category>

		<guid isPermaLink="false">http://masteringelectronicsdesign.com/?p=607</guid>
		<description><![CDATA[What is this circuit good for? It creates a single-ended-input-differential-output amplifier, in which VCM is the common mode and the main signal, in this case the average (VA+VB)/2 rides on top of VCM.  It is very useful for fully differential circuits in low noise applications, because differential amplifiers help reduce the common mode noise.  VCM in this case, sets the common mode to a useful level as required by the design.


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/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><li><a href='http://masteringelectronicsdesign.com/design-a-differential-amplifier-the-easy-way-with-mathcad/' rel='bookmark' title='Permanent Link: Design a Differential Amplifier the Easy Way with Mathcad'>Design a Differential Amplifier the Easy Way with Mathcad</a></li></ol>]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Converting a Differential Amplifier into a Summing Amplifier</title>
		<link>http://masteringelectronicsdesign.com/converting-a-differential-amplifier-into-a-summing-amplifier/</link>
		<comments>http://masteringelectronicsdesign.com/converting-a-differential-amplifier-into-a-summing-amplifier/#comments</comments>
		<pubDate>Thu, 25 Jun 2009 06:33:44 +0000</pubDate>
		<dc:creator>Adrian S. Nastase</dc:creator>
				<category><![CDATA[Analog Design]]></category>
		<category><![CDATA[Differential Amplifier]]></category>
		<category><![CDATA[Summing amplifier]]></category>
		<category><![CDATA[Superposition Theorem]]></category>
		<category><![CDATA[differential amplifier]]></category>
		<category><![CDATA[op amp]]></category>
		<category><![CDATA[operational amplifier]]></category>

		<guid isPermaLink="false">http://masteringelectronicsdesign.com/?p=369</guid>
		<description><![CDATA[Is there any link between a differential amplifier and a summing amplifier? Yes, it is.  They can be easily converted one into the other one.  While this article shows the conversion, the main purpose is to demonstrate how the same circuit can be viewed as a differential amplifier or as a summing amplifier, depending on the voltage levels in its inputs.


Related posts:<ol><li><a href='http://masteringelectronicsdesign.com/how-to-derive-the-transfer-function-of-the-inverting-summing-amplifier/' rel='bookmark' title='Permanent Link: How to Derive the Transfer Function of the  Inverting Summing Amplifier'>How to Derive the Transfer Function of the  Inverting Summing Amplifier</a></li><li><a href='http://masteringelectronicsdesign.com/how-to-derive-the-summing-amplifier-transfer-function/' rel='bookmark' title='Permanent Link: How to Derive the Summing Amplifier Transfer Function'>How to Derive the Summing Amplifier Transfer Function</a></li><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></ol>]]></description>
		<wfw:commentRss>http://masteringelectronicsdesign.com/converting-a-differential-amplifier-into-a-summing-amplifier/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<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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