ET meaning in Academic & Science ?

Answer:

What is Envelope Tracking mean?

Envelope tracking (ET) describes an approach to radio frequency (RF) amplifier design in which the power supply voltage applied to the RF power amplifier is continuously adjusted to ensure that the amplifier is operating at peak efficiency for power required at each instant of transmission.

A conventional RF amplifier designed with a fixed supply voltage operates most efficiently only when operating in compression.

Amplifiers operating with a constant supply voltage become less efficient as the crest factor of the signal increases, because the amplifier spends more time operating below peak power and, therefore, spends more time operating below its maximum efficiency.

reference

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