Title :
A new unequal three-tone signal method for AM-AM and AM-PM distortion measurements suitable for characterization of satellite communication transmitters/transponders
Author :
Ghannouchi, F.M. ; Wakana, H. ; Tanaka, M.
Author_Institution :
Kashima Space Res. Center, Ibaraki, Japan
fDate :
8/1/2000 12:00:00 AM
Abstract :
A new method for characterization of AM-AM and AM-PM distortion of power amplifiers (PAs) using only power measurements is proposed in this paper This technique was found to be suitable for the characterization of satellite communication transmitters/transponders. It consists of using an unequal three-tone signal (UTTS) to drive either the base-station PA´s transmitter or the satellite transponder´s PA and to measure the level of this UTTS at the output of the transmitter/transponder. By comparison of the three tone levels at the input and output of the transmitter/transponder, one can calculate the AM-AM compression factor and AM-PM conversion coefficient of the transmitter/transponder PA using closed-form expressions
Keywords :
data compression; electric distortion measurement; microwave measurement; microwave power amplifiers; radio transmitters; satellite communication; transponders; AM-AM distortion measurements; AM-PM distortion measurements; UTTS; closed-form expressions; compression factor; conversion coefficient; satellite communication transmitters; tone levels; transponders; unequal three-tone signal method; Distortion measurement; Frequency; Nonlinear distortion; Phase measurement; Power amplifiers; Power measurement; Satellites; Space technology; Transmitters; Transponders;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
