ECE201_27_Jung

ECE201_27_Jung - ECE 201 Lecture 27 Analysis of circuits...

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ECE 201 Lecture 27 Analysis of circuits containing Op-Amps Announcements Last Lecture #26: Operational Amplifiers This Lecture #27: Examples: Summing circuit Difference circuit Preamplifier Saturation A/D and D/A converters
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Review of Operational Amplifiers Terminals in an Op-Amp Important terminals
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Op Amp Dual-in-line Noninverting input Inverting input Output Balance Balance NC TO-5 20 or more transistors 10 or more resistors & Capacitors ( no inductors )
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Power Supply for Op Amp typically 1~15 V Inverting input Noninverting input Output Not necessarily Or GND
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What Does an Op Amp Do? Essentially a very high gain VCVS Differential input single-ended output A is typically very large R in very large and R out very small + -
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Ideal Op Amp + - + - Let R in →∞ Let R out 0 Let A Virtual short circuit
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Analysis of Circuit with Op Amps using the idealized model Replace the Op Amp with the virtual short- circuit model Apply virtual short-circuit property v - = v + i - = i + =0 Use nodal analysis to compute the voltages
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Ideal Op Amp + - + - Let R in →∞ Let R out 0 Let A Virtual short circuit
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ECE201_27_Jung - ECE 201 Lecture 27 Analysis of circuits...

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