It is the frequency range of the signal that is amplified in expected way. Efficiency, linearity and slew rate are some of the other parameters to be considered when designing an amplifier circuit. The repeater is an electronic circuit that receives a signal and retransmits the same signal with a higher power. Therefore, a repeater consists of a signal receiver, an amplifier and a transmitter. Repeaters are often used in submarine communication cables as signal would be attenuated to just a random noise when travelling such a distance.
Different types of repeaters have different types of configurations depending on the transmission medium. If the medium is microwaves, repeater may consist of antennas and waveguides. If the medium is optical it may contain photo detectors and light emitters.
Difference between Amplifier and Repeater. Amplifier is used to magnify a signal, whereas repeater is used to receive and retransmit a signal with a power gain. Sometimes, amplifiers introduce some noise to the signal, whereas repeaters contain noise eliminating parts. Unlike repeater, an amplifier cannot reproduce the original signal.
It only amplifies anything loaded, because it cannot distinguish between signals carrying information and noise. In other words, even if the incoming signal is broken and contains a few noises, the amplifier merely enhances the amplitude of that broken signal regardless of the quality of the signal. Repeater is used to regenerate the original signal with the help of the received signal pattern and retransmit the regenerative signal.
On the other hand, amplifier amplifies the signal by increasing its amplitude. Since the amplifier cannot distinguish between signals carrying information and noise, it enhances the power of the entire signal, including the noise in it. In contrast, repeater eliminates signal interference, while reproducing signals bit by bit. Repeater has high amplifier power and low output power. In contrast, the amplifier has low amplifier power and high output power.
The repeater is used in fixed environments, where radio frequency signals are stable, such as buildings. In contrast, the amplifier is used in mobile environments, where radio signals are weak and constantly changing, for example, remote areas. Amplifier minimizes the ratio between signal and noise phenomenon, thereby increasing noise.
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