Title :
A low-power all-digital signal component separator for OFDM LINC systems
Author :
Chen, Tsan-Wen ; Tsai, Ping-Yuan ; Yu, Jui-Yuan ; Lee, Chen-Yi
Author_Institution :
Dept. of Electron. Eng., Nat. Chiao-Tung Univ., Hsinchu, Taiwan
Abstract :
LINC can achieve linear amplification by using high-efficiency amplifiers. This work presents an all-digital LINC signal component separator (SCS) including the phase calculation digital signal processing and two digital-control phase shifters (DCPSs). With the duplicate DCPSs, a pre-calibration scheme is introduced to guarantee the codeword-to-phase linearity and accuracy under different PVT conditions. The proposed DCPS design provides 8-bit resolution at 100 MHz with RMS error 10 ps (0.36°) resulting in system EVM -29.21 dB with 64-QAM OFDM signals, and the performance can meet the requirements specified in IEEE 802.11a. This work is implemented in a 90 nm CMOS process. With the voltage scaling scheme to specific power domains and the low-complexity DCPS design, the overall SCS consumes 850.51 μW from 0.5 V and 1.0 V supplies.
Keywords :
OFDM modulation; amplification; amplifiers; digital control; mean square error methods; phase shifters; quadrature amplitude modulation; source separation; 64-QAM; CMOS process; DCPS; EVM; IEEE 802.11a; LINC system; OFDM system; RMS error; SCS; all digital signal component separator; codeword to phase linearity; digital control phase shifters; digital signal processing; frequency 100 MHz; high-efficiency amplifiers; linear amplification by nonlinear components; power 850.51 muW; pre-calibration scheme; size 90 nm; voltage 0.5 V to 1 V; voltage scaling scheme; CMOS process; Digital signal processing; Linearity; OFDM; Particle separators; Phase shifters; Signal design; Signal processing; Signal resolution; Voltage;
Conference_Titel :
Green Circuits and Systems (ICGCS), 2010 International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-6876-8
Electronic_ISBN :
978-1-4244-6877-5
DOI :
10.1109/ICGCS.2010.5543043
