ECE201_27_Op-Amp_circuits

# ECE201_27_Op-Amp_circuits - ECE 201 Lecture 27 Analysis of...

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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
Analysis of Circuit with Op Amps using the idealized model 1. Draw the circuit with the virtual short-circuit model for the Op-Amp. 2. Start with the input node that is not connected to the output, calculate its voltage. It usually is either shorted to ground or a voltage source, or can be calculated by voltage division (no current goes into the Op-Amp). 3. Apply virtual short-circuit property v - = v + and i - = i + =0, to get the voltage of the other input node. 4. Use KCL at the other node to compute the output voltage. 5. Check if v is beyond the power supply voltage.

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Voltage Follower Also called buffer or isolation amplifier Used to isolated one part of the circuit from the loading effect of another part + + (virtual short circuit) Why bother?
+ + + + + + Difference

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ECE201_27_Op-Amp_circuits - ECE 201 Lecture 27 Analysis of...

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