Effects of modulator misalignment on LINC transmission with traveling wave tube amplifiers

Author

Choffrut, A. ; Van Veen, B.D. ; Booske, J.H.

Author_Institution

Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA

fYear

2002

fDate

2002

Firstpage

344

Lastpage

345

Abstract

Limitations on out of band emissions impose a certain degree of linearity on amplifier operation and often forces operation significantly below saturation, the region where the amplifier is most efficient. We present a study of the sensitivity of the LInear amplification with Nonlinear Components (LINC) method using traveling wave tube amplifiers. The LINC approach decomposes the source signal into two constant envelope signals, which are passed through a pair of amplifiers and then recombined to provide an amplified version of the source signal. Since the input to each amplifier has constant envelope, the amplifiers may be operated near saturation in order to obtain high efficiency and yet the overall system remains linear.

Keywords

adjacent channel interference; linearisation techniques; modulators; radio transmitters; travelling wave amplifiers; LINC linearization; amplifier mismatch; amplifier operation; constant envelope signals; high efficiency; imperfect components; linear amplification with nonlinear components; low interchannel interference; modulator misalignment; numerical simulations; out of band emissions; quadrature modulators; traveling wave tube amplifiers; Bandwidth; Drives; Frequency; Linearity; Numerical simulation; Operational amplifiers; Performance evaluation; Power amplifiers; Testing; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference, 2002. IVEC 2002. Third IEEE International

Print_ISBN

0-7803-7256-5

Type

conf

DOI

10.1109/IVELEC.2002.999412

Filename

999412