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Op-AmpOperational Amplifier
Op-Amp name derives from early usage of these
elements in performing mathematical operations in
analog computers.

• Non Inverting Amplifier
• Inverting Amplifier
• Adder
• (and Subtractor using an Inverter)
• Differential Amplifier
• Integrator
• Differentiator

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Three Ways to Examine Op-Amp Behavior

• Consider as an Ideal Op-Amp Component
• Consider as a Feedback Model and Examine
  Behavior
• Perform Conventional Circuit Analysis

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VE VIN - VIN- VOUT a VE
VIN-
VIN
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Ideal Op-Amp Model
VE VIN - VIN- VOUT a VE
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Behavior of Feedback Model
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Behavior of Feedback Model of Non Inverting
Amplifier
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Behavior of Feedback Model
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Behavior of Feedback Model
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Behavior of Feedback Model
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Behavior of Feedback Model Summary
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Circuit Analysis Approach
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Circuit Analysis Approach
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Op-AmpOperational Amplifier
Op-Amp name derives from early usage of these
elements in performing mathematical operations in
analog computers.

• Non Inverting Amplifier
• Inverting Amplifier
• Adder
• (and Subtractor using an Inverter)
• Differential Amplifier
• Integrator
• Differentiator

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Differential Amplifier Circuit Analysis
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Differential Amplifier Circuit Analysis
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Differential Amplifier Circuit Analysis
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Differential Amplifier Circuit Analysis
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Differential Amplifier Circuit Analysis
? ZF / ZG
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Common Mode Rejection Ratio
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Common Mode Rejection RatioCMRR
where A is the differential mode gain and Acm is
the common mode gain
Ideally CMRR?? Typically 60 dB ? CMRR ? 120 dB
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Assumes R2 R4 and R1 R3
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Differential Amplifier Circuit Analysis with
Component Imbalance
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Differential Amplifier Circuit Analysis with
Component Imbalance
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Differential Amplifier Circuit Analysis with
Component Imbalance
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Differential Amplifier Circuit Analysis with
Component Imbalance
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Differential Amplifier Circuit Analysis with
Component Imbalance
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The Maximum Power Transfer Theorem simply states,
the maximum amount of power will be dissipated by
a load resistance when that load resistance is
equal to the Thevenin/Norton resistance of the
network supplying the power.
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• To create the Thevenin Equivalent Circuit we
  need
• Value of the Thevenin Voltage Source
• Value of the Thevenin Resistance

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Input and Output Impedances of Noninverting
Op-amp Configuration
The unity gain buffer input impedance is much
higher than the op-amp input impedance Rd. The
amplifier output impedance is much smaller than
the op-amp output impedance Ro.
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Instrumentation Amplifier
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Instrumentation Amplifier Example
Burr-Brown INA118
Parameters
Gain
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Instrumentation Amp (cont.)
A feedback network may also be included with the
instrumentation amplifier.
vdiff v2 - v1
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