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

Volume

61

Issue

5

fYear

2014

fDate

May-14

Firstpage

1321

Lastpage

1330

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;

fLanguage

English

Journal_Title

Circuits and Systems I: Regular Papers, IEEE Transactions on

Publisher

ieee

ISSN

1549-8328

Type

jour

DOI

10.1109/TCSI.2014.2309811

Filename

6781006