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 ?

Replies

  • Jeffrey Arulraj
    Jeffrey Arulraj
    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
  • a.alandkar
    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
  • [Prototype]
    [Prototype]
    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...๐Ÿ˜๐Ÿ˜›๐Ÿ˜’
  • a.alandkar
    a.alandkar
    [Prototype]
    You remind me writing exams in university...๐Ÿ˜๐Ÿ˜›๐Ÿ˜’
    Generally such questions are asked by the beginners, and they don't understand the gist answers...
  • ABCD ABCD
    ABCD ABCD
    A good question. It just amplifies the sine wave with an offset voltage.

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