Title :
A highly-efficient multi-band multi-mode digital quadrature transmitter with 2D pre-distortion
Author :
Hua Wang ; Peng, Chih-Hsiang ; Chao Lu ; Yaopei Chang ; Huang, R. ; Chang, Andrea ; Shih, Genie ; Hsu, Robert ; Liang, P.C.P. ; SangWon Son ; Niknejad, A. ; Chien, G. ; Tsai, C.L. ; Hwang, H.C.
Author_Institution :
MediaTek USA Inc., San Jose, CA, USA
Abstract :
A novel highly-efficient multi-band multi-mode all digital quadrature transmitter is presented. The all digital transmitter uses in-phase (I) codeword and quadrature (Q) codeword to control a switching-mode power amplifier (PA) or digital PA (DPA) consisting of in-phase PA (I-PA) and quadrature PA (Q-PA), where each of the power cells inside I-PA or Q-PA is either on or off. Due to the load interaction between I-PA and Q-PA, a 2-dimensional digital pre-distortion is applied to linearize DPA. The total transmitter is implemented in 40nm CMOS LP process and occupies a die area of 0.7mm2. The digital quadrature transmitter can support 20MHz, 40MHz, and 80MHz WiFi signals, Band 38 and Band 40 LTE signals with class 3 output power, and Bluetooth BDR, EDR2, and EDR3 signals.
Keywords :
CMOS integrated circuits; power amplifiers; radio transmitters; 2-dimensional digital pre-distortion; 2D pre-distortion; Band 38 LTE signals; Band 40 LTE signals; Bluetooth BDR signals; CMOS LP process; EDR2 signals; EDR3 signals; WiFi signals; digital PA; frequency 20 MHz; frequency 40 MHz; frequency 80 MHz; in-phase PA; in-phase codeword; load interaction; multiband multimode digital quadrature transmitter; power cells; quadrature PA; quadrature codeword; size 40 nm; switching-mode power amplifier; Delays; IEEE 802.11 Standards; Latches; Radio frequency; Radio transmitters; Table lookup;
Conference_Titel :
Circuits and Systems (ISCAS), 2013 IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4673-5760-9
DOI :
10.1109/ISCAS.2013.6571890
