Basic Op Amp circuits - Revision history

Cdxskier at 17:59, 18 January 2010

2010-01-18T17:59:34Z

← Older revision		Revision as of 10:59, 18 January 2010
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	*Victor Shepherd		*Victor Shepherd
	*[[Vier, Michael \| Michael Vier]]		*[[Vier, Michael \| Michael Vier]]

			==Readers==
			*[[Lau, Chris\|Christopher Garrison Lau I]]

Michaelvier at 18:30, 14 January 2010

2010-01-14T18:30:13Z

← Older revision		Revision as of 11:30, 14 January 2010
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	==Reviewers==		==Reviewers==
	*Victor Shepherd		*Victor Shepherd
			*[[Vier, Michael \| Michael Vier]]

Victor.shepherd: /* Reviewer */

2010-01-14T08:48:20Z

Reviewer

← Older revision		Revision as of 01:48, 14 January 2010
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	==~~Reviewer~~==		==Reviewers==
	*Victor Shepherd		*Victor Shepherd

Victor.shepherd: /* Reviewer */

2010-01-14T08:48:07Z

Reviewer

← Older revision		Revision as of 01:48, 14 January 2010
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	*[[Integrator_Amplifier \| Integrator]]		*[[Integrator_Amplifier \| Integrator]]
	*Differentiator		*Differentiator


	==Reviewer==		==Reviewer==
	*Victor Shepherd		*Victor Shepherd

Victor.shepherd: /* Reviewer */

2010-01-14T08:47:51Z

Reviewer

← Older revision		Revision as of 01:47, 14 January 2010
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	==Reviewer==		==Reviewer==
	*Victor		*Victor Shepherd

Victor.shepherd: /* Possible circuits to add in the future */

2010-01-14T08:47:34Z

Possible circuits to add in the future

← Older revision		Revision as of 01:47, 14 January 2010
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	*[[Integrator_Amplifier \| Integrator]]		*[[Integrator_Amplifier \| Integrator]]
	*Differentiator		*Differentiator

			==Reviewer==
			*Victor

Fonggr at 20:42, 12 January 2010

2010-01-12T20:42:09Z

← Older revision		Revision as of 13:42, 12 January 2010
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	*<math>R_{bias}=\frac{R_1R_2}{R_1+R_2}</math>		*<math>R_{bias}=\frac{R_1R_2}{R_1+R_2}</math>
	*To get rid of unwanted DC components, a capacitor can be added inbetween <math>R_1\,</math> and <math>V_{in}\,</math>. In this case <math>R_{bias}=R_2\,</math>		*To get rid of unwanted DC components, a capacitor can be added inbetween <math>R_1\,</math> and <math>V_{in}\,</math>. In this case <math>R_{bias}=R_2\,</math>
	~~<br>~~
	<br>		<br>
	<br>		<br>
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	*<math>R_{bias}\,</math> goes between the positive terminal and <math>V_{in}\,</math>		*<math>R_{bias}\,</math> goes between the positive terminal and <math>V_{in}\,</math>
	*To get rid of unwanted DC components, a capacitor can be added inbetween the positive terminal and <math>V_{in}\,</math>. The bias resistor has the same value, and is placed inbetween the positive input terminal and ground.		*To get rid of unwanted DC components, a capacitor can be added inbetween the positive terminal and <math>V_{in}\,</math>. The bias resistor has the same value, and is placed inbetween the positive input terminal and ground.
			<br>

			==Differential Amplifier==
			[[Image:Differential_Amplifier_2.PNG‎\|thumb\|300px\|Differential Amplifier ]]
			*<math>V_o=V_2\frac{(R_1+R_f)R_g}{(R_2+R_g)R_1}-V_1\frac{R_f}{R_1}</math>
			*If you let <math>R_1=R_2\,</math> and <math>R_g=R_f\,</math> then the equation simplifies to <math>V_o=\frac{R_f}{R_1}(V_2-V_1)</math>

	<br>		<br>
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	<br>		<br>
	<br>		<br>
			<br>
	~~==Differential Amplifier==~~
	~~[[Image:Differential_Amplifier_2.PNG‎\|thumb\|300px\|Differential Amplifier ]]~~
	*<~~math>V_o=V_2\frac{(R_1+R_f)R_g}{(R_2+R_g)R_1}-V_1\frac{R_f}{R_1}</math>~~
	*If you let <math>R_1=R_2\,</math> and <math>R_g=R_f\,</math> then the equation simplifies to <math>V_o=\frac{R_f}{R_1}(V_2-V_1)</math>

	==Possible circuits to add in the future==		==Possible circuits to add in the future==

Fonggr: /* Possible circuits to add in the future */

2010-01-12T20:40:15Z

Possible circuits to add in the future

← Older revision		Revision as of 13:40, 12 January 2010
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	*Current-to-voltage converter		*Current-to-voltage converter
	*Current amplifier		*Current amplifier
	*Integrator		*[[Integrator_Amplifier \| Integrator]]
	*Differentiator		*Differentiator

Fonggr at 20:39, 12 January 2010

2010-01-12T20:39:44Z

← Older revision		Revision as of 13:39, 12 January 2010
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	*<math>V_o=V_2\frac{(R_1+R_f)R_g}{(R_2+R_g)R_1}-V_1\frac{R_f}{R_1}</math>		*<math>V_o=V_2\frac{(R_1+R_f)R_g}{(R_2+R_g)R_1}-V_1\frac{R_f}{R_1}</math>
	*If you let <math>R_1=R_2\,</math> and <math>R_g=R_f\,</math> then the equation simplifies to <math>V_o=\frac{R_f}{R_1}(V_2-V_1)</math>		*If you let <math>R_1=R_2\,</math> and <math>R_g=R_f\,</math> then the equation simplifies to <math>V_o=\frac{R_f}{R_1}(V_2-V_1)</math>

			==Possible circuits to add in the future==
			*Voltage-to-current converter
			*Current-to-voltage converter
			*Current amplifier
			*Integrator
			*Differentiator

Fonggr at 20:37, 12 January 2010

2010-01-12T20:37:08Z

← Older revision		Revision as of 13:37, 12 January 2010
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	[[Image:InvertingAmplifier.png\|thumb\|300px\|Inverting Amplifier]]		[[Image:InvertingAmplifier.png\|thumb\|300px\|Inverting Amplifier]]
	*Uses negative feedback to invert and amplify voltage. Using nodal analysis at the negative terminal, the gain is found to be <math>-\frac{R_2}{R_1}</math>		*Uses negative feedback to invert and amplify voltage. Using nodal analysis at the negative terminal, the gain is found to be <math>-\frac{R_2}{R_1}</math>
			*<math>R_{bias}=\frac{R_1R_2}{R_1+R_2}</math>
	<br>		*To get rid of unwanted DC components, a capacitor can be added inbetween <math>R_1\,</math> and <math>V_{in}\,</math>. In this case <math>R_{bias}=R_2\,</math>
	<br>
	<br>
	<br>		<br>
	<br>		<br>
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	<br>		<br>
	<br>		<br>

	==Summing Amplifier==		==Summing Amplifier==
	[[Image:Summing_Amplifier.PNG‎\|thumb\|300px\|Summing Amplifier]]		[[Image:Summing_Amplifier.PNG‎\|thumb\|300px\|Summing Amplifier]]
	*<math>V_o=-R_f \left( \frac{V_3}{R_3}+\frac{V_2}{R_2}+\frac{V_1}{R_1}\right)</math>		*<math>V_o=-R_f \left( \frac{V_3}{R_3}+\frac{V_2}{R_2}+\frac{V_1}{R_1}\right)</math>
	*If all resistances are equal, then the output voltage is the (negative) sum of the input voltages		*If all resistances are equal, then the output voltage is the (negative) sum of the input voltages
			*<math>\frac{1}{R_{bias}}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}+\frac{1}{R_f}</math>

	~~<br>~~
	~~<br>~~
	~~<br>~~
	<br>		<br>
	<br>		<br>
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	[[Image:Noninverting_Amplifier.PNG‎\|thumb\|300px\|Noninverting Amplifier]]		[[Image:Noninverting_Amplifier.PNG‎\|thumb\|300px\|Noninverting Amplifier]]
	*<math>V_o=V_{in} \left(1+\frac{R_2}{R_1}\right)</math>		*<math>V_o=V_{in} \left(1+\frac{R_2}{R_1}\right)</math>
			*<math>R_{bias}=\frac{R_1R_2}{R_1+R_2}</math>
			*<math>R_{bias}\,</math> goes between the positive terminal and <math>V_{in}\,</math>
			*To get rid of unwanted DC components, a capacitor can be added inbetween the positive terminal and <math>V_{in}\,</math>. The bias resistor has the same value, and is placed inbetween the positive input terminal and ground.

	<br>		<br>
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	<br>		<br>
	<br>		<br>

	==Differential Amplifier==		==Differential Amplifier==
	[[Image:Differential_Amplifier_2.PNG‎\|thumb\|300px\|Differential Amplifier ]]		[[Image:Differential_Amplifier_2.PNG‎\|thumb\|300px\|Differential Amplifier ]]
	*<math>V_o=V_2\frac{(R_1+R_f)R_g}{(R_2+R_g)R_1}-V_1\frac{R_f}{R_1}</math>		*<math>V_o=V_2\frac{(R_1+R_f)R_g}{(R_2+R_g)R_1}-V_1\frac{R_f}{R_1}</math>
	*If you let <math>R_1=R_2\,</math> and <math>R_g=R_f\,</math> then the equation simplifies to <math>V_o=\frac{R_f}{R_1}(V_2-V_1)</math>		*If you let <math>R_1=R_2\,</math> and <math>R_g=R_f\,</math> then the equation simplifies to <math>V_o=\frac{R_f}{R_1}(V_2-V_1)</math>