Title :
Optimized Closed Loop Polar GSM/GPRS/EDGE Transmitter
Author :
Norris, George ; Alford, Ron ; Gehman, John ; Gilsdorf, Ben ; Hoggarth, Steve ; Kurtzman, Gary ; Meador, Rich ; Newman, David ; Peckham, David ; Sherman, Rick ; Staudinger, Joe ; Sadowniczak, Gary ; Traylor, Kevin
Author_Institution :
Freescale Semicond., Tempe, AZ
Abstract :
An amplitude-only closed-loop EDGE transmitter using a PA with low AM-PM distortion is presented with a comparable size to existing open loop EDGE PA modules and added closed loop current <20mA. The complete PA/controller consumes 700mA at 28dBm and <80mA at 6dBm. RMS EVM is <2.1%, ACPR margins are >5dB, and RX band noise is <-81dBm/100KHz at 20MHz offset. Reflected power amplitude feedback allows the transmitter to meet ORFS/EVM specifications under antenna VSWR as high as 6:1
Keywords :
cellular radio; packet radio networks; radio transmitters; 20 MHz; 700 mA; ACPR margins; AM-PM distortion; EDGE; GPRS; GSM; ORFS; PA modules; RMS EVM; RX band noise; VSWR; closed loop current; closed loop polar transmitter; reflected power amplitude feedback; Detectors; GSM; Ground penetrating radar; Phase modulation; Power generation; Power harmonic filters; Radio frequency; Radiofrequency amplifiers; Transmitters; Voltage control;
Conference_Titel :
Microwave Symposium Digest, 2006. IEEE MTT-S International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9541-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2006.249836
