Title :
A Highly-Efficient Multi-Band Multi-Mode All-Digital Quadrature Transmitter
Author :
Hua Wang ; Chun-Hsien Peng ; Yaopei Chang ; Huang, Richard Z. ; Chih-Wei Chang ; Xin-Yu Shih ; Chia-Jui Hsu ; Liang, P.C.P. ; Niknejad, Ali M. ; Chien, G. ; Chao Long Tsai ; 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. In the transmitter, a switching-mode power amplifier (PA), also referred to as digital power amplifier (DPA), which consists of an in-phase PA (I-PA) and a quadrature PA (Q-PA), is controlled by the digital codewords based on an input signal to turn on and off the power cells inside the I-PA or the Q-PA. Due to the load interaction between the I-PA and the Q-PA, a 2-dimensional (2-D) digital pre-distortion (DPD) is applied to linearize the DPA. The whole transmitter is implemented in 40 nm CMOS LP process and occupies a die area of 0.7 mm2. The all-digital quadrature transmitter can support 20 MHz, 40 MHz, and 80 MHz 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; Long Term Evolution; power amplifiers; radio transmitters; 2D digital predistortion; CMOS LP process; digital power amplifier; frequency 20 MHz; frequency 40 MHz; frequency 80 MHz; highly efficient multiband multimode all digital quadrature transmitter; load interaction; size 40 nm; switching mode power amplifier; Delays; IEEE 802.11 Standards; OFDM; Quantization (signal); Radio transmitters; Table lookup; 2-dimensional digital pre-distortion; Bluetooth; LTE; WiFi; digital power amplifier; switching-mode power amplifier;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2014.2309811
