Amplification - Amplification curve

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It describes the amplifier's action on the input signal. The following diagram illustrates a voltage amplifier's possible amplification curve:

Amplification - Amplification curve

Amplification curve

The diagram shows how an input voltage of, say, 50 mV is returned at the output with a 300 mV amplitude. What also is highlighted in the diagram is that input voltage cannot go beyond 100 mV seeing that with greater values the output voltage is constant and equal to the value indicated as Vmax. Naturally the same is also true for negative voltages: a voltage of -50 mV is amplified at -300 mV and an input value that is inferior to -100 mV saturates the amplifier and returns an amplitude value of -Vmin. The diagram also shows the dotted line indicating the unity gain. When an amplifier has such an amplification curve, the output voltage is perfectly equal to the input voltage.

The following figure shows the amplification of two sinusoidal signals, one with an amplitude within the limits the amplifier can handle, and the other with an amplitude that goes beyond these limits at certain points, thus causing saturation:

Amplification - Amplified signal

Amplified signal

We can see how the second sinusoid is amplified but is then severed from a certain amplitude value upwards.








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