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1 More on Op Amps Discussion D12.1

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2 Ideal Op Amp 1) The open-loop gain, A v, is infinite. 2) The current into the inputs are zero.

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3 Ideal Op Amp with Negative Feedback Golden Rules of Op Amps: 1.The output attempts to do whatever is necessary to make the voltage difference between the inputs zero. 2.The inputs draw no current.

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4 Non-inverting Amplifier Closed-loop voltage gain

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5 Unity-Gain Buffer Closed-loop voltage gain Used as a "line driver" that transforms a high input impedance (resistance) to a low output impedance. Can provide substantial current gain.

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6 Inverting Amplifier Current into op amp is zero

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7 Question Find i 0

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8 Question Find i 0

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9 Differential Amplifier Current into op amp is zero

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10 Differential Amplifier

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11 Summing Circuit

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12 Integrator

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13 Active Filter

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14 Active Filter What will the net gain be at HI if you put two such filters in series?

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15 Current-to-Voltage Converter

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16 Photodiode Circuit At 50 mW

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