Title :
On the behavior of the LINC transmitter
Author :
Casadevall, Fernando ; Olmos, Juan
Author_Institution :
Dept. de Teoria del Senyal i Communicacions, Univ. Politecnica de Catalunya, Barcelona, Spain
Abstract :
The effects of RF signal processing impairments in a LINC transmitter are analyzed. A theoretical analysis of the effect of three different kinds of imbalances between the parallel signal paths in a real LINC transmitter is presented. These include the power gain and delay (or phase) imbalance between the two RF paths and the different nonlinear characteristics of both RF power amplifiers. In all cases analytical expressions have been obtained in order to evaluate the effect of the imbalances on the performance of the LINC transmitter. The gain and the phase imbalance between both power amplifiers appears as a serious constraint on performance. The system degradations are described in terms of the undesired response rejection at the system output. A classical two tones test has been used
Keywords :
mobile radio systems; power amplifiers; radio transmitters; radiofrequency amplifiers; signal processing; LINC transmitter; RF power amplifiers; RF signal processing impairments; delay imbalance; parallel signal paths; phase imbalance; power gain; theoretical analysis; two tones test; undesired response rejection; Degradation; Delay; Performance analysis; Performance gain; Power amplifiers; Radio frequency; Radiofrequency amplifiers; Signal analysis; Testing; Transmitters;
Conference_Titel :
Vehicular Technology Conference, 1990 IEEE 40th
Conference_Location :
Orlando, FL
DOI :
10.1109/VETEC.1990.110291
