1.15 Noise

i ) Correlated Noise :

• Noise that exist only when a signal is present

• Definition: a form of internal noise that is correlated to the signal and cannot be present in a circuit unless there is a signal.

• How it create: produced by a nonlinear amplification resulting in nonlinear distortion.

• Types: There are 2 types of nonlinear distortion that create unwanted frequencies that interfere with the signal and degrade the performance;

1) Harmonic Distortion :

• Example: In audio systems, lower distortion means the components in a loudspeaker, amplifier or microphone produce a more accurate reproduction of

2) Intermodulation Distortion :

2) Intermodulation distortion :

• intermodulation distortion is the generation of unwanted sum and difference frequencies produced when two or more signals mix in a nonlinear device (cross products).

• Sum and difference frequencies are called cross product.

• Unwanted cross product frequencies can interfere with the information signals.

ii) Uncorrelated Noise

•Noise that present all the time whether there is a signal or not

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1.14 Potentionmeter