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

    Abhishek Rawal

    Abhishek Rawal

    @abhishek-fg9tRh
    Updated: Oct 23, 2024
    Views: 1.2K
    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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Replies

  • 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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