1• The Operational AmplifierECE 201: Lecture 23Borja PeleatoOperational Amplifier (Op Amp)• An operational amplifier is a complicated circuit packed into a chip, which we use as a single circuit element• Up to now we have seen two terminal circuit elements, but the op amp has more– Two inputs, labeled + and –– One output– Others not covered in 201 (power source, ground, etc.)• It behaves as an amplifier of the voltage difference between the inputs2Ideal Op Amp• Infinite input resistance hence • Zero output resistance hence output voltage independent of the load connected to it• Infinite gain• Virtual short circuit between inputs (this is the key to solving problems!)3Inverting amplifier4Non-inverting
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