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  • Differential mode and Common mode amplifier

    Jeffrey Arulraj

    Member

    Updated: Oct 26, 2024
    Views: 1.1K
    In these modes what is the prime difference I found this

    In differential mode the difference in the signal is amplified and in common mode the common pulse is amplified

    Is it so do correct me in this
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  • sowmiya vd

    Member • Oct 12, 2012

    I think,
    In common mode emitter is varied and there is negative feedback gain minimum. in differential mode emitter in constant collector varied so there is no negative feedback gain is maximum
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  • Jeffrey Arulraj

    Member • Oct 12, 2012

    But you are yet to tell how the negative feedback is coming in the differential mode
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  • sowmiya vd

    Member • Oct 13, 2012

    At common mode (the two input voltages change in the same directions), the two voltage (emitter) followers cooperate with each other working together on the common high-resistive emitter load (the "long tail"). They all together increase or decrease the voltage of the common emitter point (figuratively speaking, they together "pull up" or "loose" it so that it moves). In addition, the dynamic load "helps" them by changing its instant ohmic resistance in the same direction as the input voltages (it increases when the voltage increases and vice versa.) thus keeping up constant total resistance between the two supply rails. There is a full (100%) negative feedback; the two input base voltages and the emitter voltage change simultaneously while the collector currents and the total current do not change. As a result, the output collector voltages do not change as well<DUPLICATE>
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  • sowmiya vd

    Member • Oct 13, 2012

    At common mode (the two input voltages change in the same directions), the two voltage (emitter) followers cooperate with each other working together on the common high-resistive emitter load (the "long tail"). They all together increase or decrease the voltage of the common emitter point (figuratively speaking, they together "pull up" or "loose" it so that it moves). In addition, the dynamic load "helps" them by changing its instant ohmic resistance in the same direction as the input voltages (it increases when the voltage increases and vice versa.) thus keeping up constant total resistance between the two supply rails. There is a full (100%) negative feedback; the two input base voltages and the emitter voltage change simultaneously while the collector currents and the total current do not change. As a result, the output collector voltages do not change as well
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  • Jeffrey Arulraj

    Member • Oct 13, 2012

    Why doubling the same post yer Hello
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  • sowmiya vd

    Member • Oct 13, 2012

    sorry!!!
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