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Tai-Cheng LeeFall 2007
Operational Amplifiers
Tai-Cheng LeeElectrical Engineering/GIEE, NTU
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Ideal Op Amp Characteristics
• Ideal op amp
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Differential and Common-Mode Signal
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Inverting Configuration
• 2.2 Inverting amplifiers
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Inverting Amplifier with Finite OP Gain
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Weighted Summer-(1)
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Weighted Summer-(2)
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Noninverting Configuration
• 2.3 Noninverting amplifiers
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Voltage Follower
• Source follower
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Difference Amplifier
• 2.4 Differential Amplifier
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Common-Mode Rejection Ratio
• CMRR
• Single op-amp difference amplifier
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Superposition in Difference Amplifier-(1)
• Differential Signal
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Superposition in Difference Amplifier-(2)
• Common-Mode Signal
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Superposition in Difference Amplifier-(3)
• Input Impedance
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Instrumentation Amplifier-(1)
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Instrumentation Amplifier-(2)
• If signals are in differential
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Instrumentation Amplifier-(3)
• Advantages and disadvantages
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Non-Ideal Effect in Op Amp–(1)
• Finite bandwidth
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Non-Ideal Effect in Op Amp–(2)
• Finite gain
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Large-Signal Analysis
• Vmax and Vmin for op amp
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Slew Rate-(1)
• Maximum rate of changes at the output
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Slew Rate-(2)
• Full-Power Bandwidth
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DC Imperfection
• 2.7 DC Imperfection
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DC Offset-(1)
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DC Offset-(2)
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Input Bias and Offset Current-(1)
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Input Bias and Offset Current-(2)
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Input Bias and Offset Current-(3)
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Integrator and Differentiator
• 2.8 Inverting configuration with general impedances