Bandwidth is everything for some applications, including many communications systems, and boosting signal levels over broad bandwidths requires a special kind of amplifier. Typically, a distributed amplifier is used for such applications. As its name might suggest, gain is distributed among a number of transistors or active stages within the amplifier, such as field-effect transistors (FETs) in GaAs distributed amplifiers, to achieve level signal gain over wide bandwidths.
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