Purdue
ECE 20100 -
lecture 23 - The Operational Amplifier
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ECE 201 Lecture 23 Borja Peleato The Operational Amplifier 1 Operational 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 inputs 2 Ideal 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 3 Inverting amplifier 4 Non inverting amplifier 5 Buffer 6 Example 7 8
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