A Highly-Efficient Multi-Band Multi-Mode All-Digital Quadrature Transmitter

• Published in: IEEE transactions on circuits and systems. I, Regular papers Vol. 61; no. 5; pp. 1321 - 1330
• Main Authors: Hua Wang, Chun-Hsien Peng, Yaopei Chang, Huang, Richard Z., Chih-Wei Chang, Xin-Yu Shih, Chia-Jui Hsu, Liang, Paul C. P., Niknejad, Ali M., Chien, George, Chao Long Tsai, Hwang, H. C.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-05-2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 2-dimensional digital pre-distortion; Bluetooth; Circuits; CMOS; Delays; Digital; digital power amplifier; IEEE 802.11 Standards; LTE; OFDM; Power amplifiers; Quadratures; Quantization (signal); Radio transmitters; switching-mode power amplifier; Table lookup; Transmitters; WiFi
• ISSN: 1549-8328; 1558-0806
• DOI: 10.1109/TCSI.2014.2309811

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 mm 2 . 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.