l15 - 6.111 Lecture 15 Operational Amplifiers Uses of Op...

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6.111 Lecture # 15 Operational Amplifiers Parameter Ideal '741 '357± Int Gain A Infinity 200,000/f(Hz) 20x10^6/f(Hz)± Output Impedance Zout 0 ~75 Ohms± Input Impedance Zin Infinity ~300 kOhms ~10^12 Ohms± Uses of Op Amps Analog uses employ negative feedback to drive + input to (nearly) the same potential as the - input Follower and Non-Inverting Amplifier Circuits: 1 Positive Feedback More Analog Circuits Inverting Amplifier and Differential Input Amplifier Analog Comparator Is V+ > V- ? Output is a DIGITAL signal Schmitt Trigger squares up signals 3 4 2
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Bias Currents Many Op-Amps have bipolar inputs Emitter coupled transistor pair High differential gain But sum of input currents = I e / β 2 * I e Many Op-Amps have FET inputs Bias currents are very small Pinouts: 8-pin "mini-dip" Common packaging Pin 3 Positive Input± Pin 2 Negative Input± Pin 6 Output± Pin 7 Positive Supply± Pin 4 Negative Supply± You may need these pinouts:± 5 6 Summing Junction Slew Rate If V+ is at zero potential, so is V- (assuming negative feedback) Is related to frequency response
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This note was uploaded on 07/20/2009 for the course ELECTRICAL 6.111 taught by Professor Prof.dontroxel during the Fall '02 term at MIT.

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l15 - 6.111 Lecture 15 Operational Amplifiers Uses of Op...

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