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  1. Voltage gain
  2. Frequency response
  3. Harmonic distortion
  4. Input/output impedances
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Option 4 : Input/output impedances

Input/output impedances used for distinguishing between a small signal and a large signal amplifier.

Amplifier has high input impedance and low output impedance. Small signal deals with very low amplitude signals and it is apply-input side of amplifier. Large signal deals with very high amplitude signal.

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