A Low noise amplifier (or LNA) is a special amplifier that is designed to be the first amplifier in a receiver. It is vital that the first amplifier of a receiver has low noise, because the noise of the whole system is dominated by the first amplifier.
from My Pocket http://dangerousprototypes.com/2015/05/19/low-noise-amplifier-100mhz-to-300mhz/
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