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Analyzing the output impedance and open loop gain of a IC-741 Op-Amp
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[QUOTE="PhysicsTruth, post: 6546102, member: 684800"] [B]Homework Statement:[/B] Analyze qualitatively, the output impedance and the open loop gain of a IC 741 Op-Amp from its internal circuit. [B]Relevant Equations:[/B] ##V_{out} = A_{o} ( V_{in1} - V_{in2})## ##A_{o}## is the open loop voltage gain. Here is the internal circuit of the 741 Op-Amp -[ATTACH type="full"]289752[/ATTACH] Looking at the output stage, the output impedance seems to be the series combination of ##25 \Omega## and ##50 \Omega##, that is ##75 \Omega##. Is this a qualitative explanation enough to justify the output impedance, or am I wrong somewhere and need to take into account some other impedances as well. Coming to the open-loop gain, the output Push-Pull amplifier has no voltage gain, only it's achieved at the Darlington pair and the initial input stage emitter followers. How do I go on to claim qualitatively that the open loop gain is significantly high, and nearing infinity? [/QUOTE]
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Analyzing the output impedance and open loop gain of a IC-741 Op-Amp
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