n.electronic equipment that increases strength of signals passing through it

RF power amplifiers for wireless communications
RF Power Amplifiers for Wireless Communications
RF power amplifiers for wireless communications
Power amplifiers and transmitters for RF and microwave
Modeling Erbium-Doped Fiber Amplifiers
High efficiency amplifiers having multiple amplification paths
Frequency-Independent and Frequency-Dependent Nonlinear Models of TWT Amplifiers
Class E-A new class of high-efficiency tuned single-ended switching power amplifiers
The Transient Response of Damped Linear Networks with Particular Regard to Wideband Amplifiers
Self-phase modulation and spectral broadening of optical pulses in semiconductor laser amplifiers