Efficiency Enhancement of Traveling-Wave Tube Amplifier with Dynamically Adjusted Collector Bias Voltages
The growing use of multiple-carrier, complex spectrally efficient waveforms such as quadrature-amplitude- modulation (QAM) and code division multiple access (CDMA) in communication systems is placing a growing demand on the power efficiency and linearity of microwave power amplifiers. Continuing reliance on vacuum electronics amplifiers such as traveling-wave tube amplifiers (TWTAs) in space-based transponders and ground terminals requires tube engineers and system designers to constantly develop new techniques to improve the efficiency of the devices.