Opamp With One Terminal With AC Input & Other With DC Input.

@abhishek-fg9tRh • Oct 23, 2024

Oct 23, 2024

1.4K

As we know, opamp amplifies both ac & dc input signals.
I would like to know what could be the resultant output if one terminal is given dc signal & other with ac signal.
How will differential amp in opamp can differentiate dc-ac signal ?

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Jeffrey Arulraj

@jeffrey-xA7lUP • Nov 14, 2013

Differential amplifier sees instantaneous voltage only mate

It will just compute the difference between the Voltages at that particular instant and doesn't give a damn about the other previous values

It is a Magnitude difference finder only mate nothing special
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a.alandkar

@aalandkar-R9Nf1k • Nov 17, 2013

If you give ac to one terminal and dc to another one, it will compare the voltage levels and then as per its working, o/p will toggle in between +Vsat and -Vsat (in case of dual supply) or in between +Vsat and 0 V (in case of single supply). if the DC is a constant voltage and AC is sine wave then as a result you will get square wave / pulses/ rectangular wave, depending on the applied voltage level. (Simply op-amp will work as a comparator
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[Prototype]

@prototype-G9Gn5k • Nov 19, 2013

a.alandkar
If you give ac to one terminal and dc to another one, it will compare the voltage levels and then as per its working, o/p will toggle in between +Vsat and -Vsat (in case of dual supply) or in between +Vsat and 0 V (in case of single supply). if the DC is a constant voltage and AC is sine wave then as a result you will get square wave / pulses/ rectangular wave, depending on the applied voltage level. (Simply op-amp will work as a comparator
You remind me writing exams in university...😁😛😒
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a.alandkar

@aalandkar-R9Nf1k • Nov 19, 2013

[Prototype]
You remind me writing exams in university...😁😛😒
Generally such questions are asked by the beginners, and they don't understand the gist answers...
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ABCD ABCD

@abcd-2NEyMb • Nov 19, 2013

A good question. It just amplifies the sine wave with an offset voltage.
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