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

Abhishek
Member • Nov 13, 2013

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

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

Member • 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

Member • 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]

Member • 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

Member • 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

Member • Nov 19, 2013

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

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