215+Ch4Student - 4. OPERATIONAL AMPLIFIERS CIRCUITS by...

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4. OPERATIONAL AMPLIFIERS CIRCUITS by Ulaby & Maharbiz
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Operational Amplifier “Op Amp” Two input terminals, positive (non- inverting) and negative (inverting) One output Power supply V + , and Op Amp showing power supply Op Amp with power supply not shown (which is how we usually display op amp circuits)
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Inside The Op-Amp (741)
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Gain Key important aspect of op amp: high voltage gain Output , A is op-amp gain (or open-loop gain) – different from circuit gain G Linear response
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Equivalent Circuit
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Example 4-1: Op Amp Amplifier KCL at Node a: KCL at Node b: For infinite A : Node a Node b
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Negative Feedback Feedback : return some of the output to the input Negative feedback decreases input signal Achieves desired circuit gain, with wide range for input Negative Feedback No Feedback
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Medium gain/medium dynamic range Very high gain/very small dynamic range (input) output
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215+Ch4Student - 4. OPERATIONAL AMPLIFIERS CIRCUITS by...

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