Title :
Efficiency Enhancement of Traveling-Wave Tube Amplifier with Dynamically Adjusted Collector Bias Voltages
Author :
Qiu, J.X. ; Abe, D.K. ; Antonsen, T.M., Jr. ; Danly, B.G. ; Levush, B. ; Myers, R.E.
Author_Institution :
Naval Res. Lab., Washington
Abstract :
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.
Keywords :
microwave power amplifiers; transponders; travelling wave amplifiers; collector bias voltage; microwave power amplifier; space-based transponder; traveling-wave tube amplifier; Electron tubes; Linearity; Microwave amplifiers; Microwave devices; Modulation coding; Multiaccess communication; Power amplifiers; Quadrature amplitude modulation; Vacuum systems; Voltage;
Conference_Titel :
Vacuum Electronics Conference, 2007. IVEC '07. IEEE International
Conference_Location :
Kitakyushu
Print_ISBN :
1-4244-0633-1
DOI :
10.1109/IVELEC.2007.4283293
