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What is the meaning of op-amp saturation and how is it measured?
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[QUOTE="JJBladester, post: 4527333, member: 148446"] [h2]Homework Statement [/h2] What exactly is op-amp saturation? [h2]Homework Equations[/h2] [tex]V_{out}=A_{v}V_{in}[/tex] [h2]The Attempt at a Solution[/h2] I am doing a lab where we use an LM339A quad voltage comparator and a voltage divider network to create a voltmeter. A single red LED is connected to each of the four output terminals. When the input voltage exceeds V[SUB]ref[/SUB] of each comparator, the LED is forward biased, conducts current and lights up. The lab asks us to find the saturation voltage of the comparator by "measuring any comparator output terminal when an LED is lit". I did this and found [tex]V_{sat}=261mV[/tex] The datasheet has a saturation voltage [itex]V_{OL}=250mV[/itex] (typical) and a voltage gain [itex]A_{V}=200V/mV[/itex] (typical). So, my measured saturation voltage is about 4% off from the datasheet. Not bad... but I'm having a hard time describing exactly what is meant by saturation voltage. I read [URL="https://www.physicsforums.com/showthread.php?t=340948"]this PF post[/URL] but I'm still slightly confused. I believe that saturation occurs when the open-loop input differential voltage exceeds some small voltage and that since the op-amp has a high open-loop gain, the output is driven to ±V[SUB]out(max)[/SUB]. Here's what I wrote in my lab... Does it make sense? [/QUOTE]
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What is the meaning of op-amp saturation and how is it measured?
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