Title :
Polar loop transmitter for GSM/GPRS/EDGE
Author :
Sowlati, T. ; Rozenblit, D. ; Pullela, R. ; Damgaard, M. ; Koh, D. ; McCarthy, E. ; Ripley, D. ; Balteanu, F. ; Gheorghe, I. ; Juan, K. ; Wloczysiak, S. ; Firoiu, D.
Author_Institution :
Skyworks Solutions Inc., Irvine, CA, USA
Abstract :
An EDGE transmitter using a nonlinear GSM type PA is presented. It is based on a polar loop architecture that employs separate feedback control of the amplitude and the phase of the output signal. With this approach, the problems with AM-to-PM as well as AM-to-AM of the nonlinear PA are essentially eliminated. There is no mode change between GMSK and EDGE, and the transmitter operates seamlessly in multi-slot EGPRS. The polar modulation transmitter meets all the GSM type approval requirements for both EDGE and GMSK in the quad band (850/900/1800/1900 MHz). It is part of an RF subsystem which is in production.
Keywords :
UHF power amplifiers; amplitude modulation; cellular radio; circuit feedback; minimum shift keying; packet radio networks; phase modulation; radio transmitters; 1800 MHz; 1900 MHz; 850 MHz; 900 MHz; EDGE; GMSK; GPRS; GSM; amplitude modulation; cell phones; multislot EGPRS; nonlinear PA; phase modulation; polar loop transmitter; polar modulation transmitter; separate amplitude/phase feedback control; Amplitude modulation; Bandwidth; Feedback loop; GSM; Ground penetrating radar; Phase frequency detector; Phase modulation; Radio frequency; Radio transmitters; Voltage;
Conference_Titel :
Radio Frequency integrated Circuits (RFIC) Symposium, 2005. Digest of Papers. 2005 IEEE
Print_ISBN :
0-7803-8983-2
DOI :
10.1109/RFIC.2005.1489173
