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Operation Amplifier

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Golden Rules of OP Amp 1.i in =0, no current flow into op amp. 2.V + =V - Typically one end of op amp is connected to ground, therefore, V + =V - = 0V, virtual ground. Often V + is connected to ground to avoid stability problem.

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Inverting Amplifier Feedback resistor, always to negative input

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Summing Amplifier: Add Circuit If R S1 =R S2 =…=R SN =R S

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Non-innverting Amplifier Feedback resistor, always to negative input

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Voltage Follower Applications: Since the input resistance of an op amp ∞, it will have no effect on the input.

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Differential Amplifier Very useful if both signals are corrupted with noise: Electrocardiogram (EKG)

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