Communication Systems
In case of low level amplitude modulation system, the amplifiers following the modulated stage must be

Class C amplifiers
Linear devices
Non-linear devices
Harmonic devices

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Communication Systems
In Pulse Code Modulation system

Quantising noise can be reduced by decreasing the number of standard levels
Large bandwidth is required
Quantising noise can be overcome by companding
Suffers from the disadvantage of its incompatibly with TDM

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