Title :
A 45GHz CMOS transmitter SoC with digitally-assisted power amplifiers for 64QAM efficiency improvement
Author :
LaRocca, T. ; Yi-Cheng Wu ; Snyder, R. ; Patel, Jatin ; Khanh Thai ; Wong, Charence ; Yang, Yi ; Gilreath, L. ; Watanabe, Manabu ; Hao Wu ; Chang, Mau-Chung Frank
Author_Institution :
Northrop Grumman Aerosp. Syst., Redondo Beach, CA, USA
Abstract :
A 45GHz 64QAM system-on-chip (SoC) CMOS transmitter with digitally-assisted power amplifiers (DAPA) is presented. The SoC includes a 7M gate ASIC with 9b reconfigurable symbol mapping, 8X upsampling, 161tap pulse shape filtering, IQ imbalance correction and DAPA envelope/time estimation. The ASIC feeds two 10b IQ current-steering DACs and active IQ modulator. A unique transformer splitting up converter drives eight parallel combined DAPAs. The chip is packaged in aluminum housing with WR22 outputs. A 64QAM signal achieves 1.8% EVM with 33dBc ACPR at 45GHz. The data rate is 450Mbps and the integrated output power exceeds -10dBm.
Keywords :
CMOS analogue integrated circuits; power amplifiers; pulse shaping; quadrature amplitude modulation; system-on-chip; transformers; 64QAM efficiency improvement; 7M gate ASIC; ACPR; CMOS transmitter SoC; DAPA envelope-time estimation; IQ current-steering DAC; IQ imbalance correction; WR22 outputs; active IQ modulator; aluminum housing; bit rate 450 Mbit/s; converter; digitally-assisted power amplifier; frequency 45 GHz; pulse shape filtering; reconfigurable symbol mapping; system-on-chip CMOS transmitter; unique transformer; CMOS integrated circuits; Computer architecture; Modulation; Power amplifiers; Radio frequency; System-on-chip; CMOS technology; Power amplifier; Quadrature amplitude modulation; System-on-a-chip;
Conference_Titel :
Radio Frequency Integrated Circuits Symposium (RFIC), 2013 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4673-6059-3
DOI :
10.1109/RFIC.2013.6569604
