NDLI: Development of ultra-linear traveling wave tubes for telecommunications applications

Content Provider	IEEE Xplore Digital Library
Author	Goebel, D.M. Ronglin Liou Menninger, W.L.
Copyright Year	2000
Description	Author affiliation: Hughes Electron Dynamics, Torrance, CA, USA (Goebel, D.M.)
Abstract	Traveling wave tubes (TWT) intended for telecommunications applications are increasingly required to have high linearity, good intermodulation performance, and high power levels; especially for use as modern multi-carrier power amplifiers (MCPA) and in systems that use digital signal encryption. The linearity of the TWT is greatly improved by optimization of the taper of the helix circuit to reduce the gain compression and phase shift of the output signal as the drive level is increased, and by operation of the tube significantly backed off from saturation in the linear region of the AM/AM and AM/PM transfer curves. However, backed off operation at a given output power level requires increased beam current and power handling capabilities compared to a design operating at saturation, and also results in a greatly reduced efficiency of the TWT. At Hughes, we have developed L-band and S-band TWTs for telecommunication applications that provide good intermodulation performance and high efficiency compared to solid-state amplifiers. The L-band model TWT normally operates 8 dB backed off from 1600 W at saturation, and produces over 250 W of continuous output power with an 8-tone continuous-random-phase signal intermodulation level of -28 dBc and an efficiency of over 25%. The S-band model TWT normally operates 6 dB backed off from 2000 W at saturation, and has produced over 500 W of continuous output power at an efficiency of over 35%.
File Size	103324
File Format	PDF
ISBN	0780359879
DOI	10.1109/OVE:EC.2000.847398
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-05-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Linearity Power generation High power amplifiers L-band Solid state circuits Power amplifiers Design optimization Circuit synthesis Electrons Electronic mail
Content Type	Text
Resource Type	Article

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