A Low-Power All-Digital Signal Component Separator for OFDM LINC Systems
Source: National Chiao-Tung University
LINC can achieve linear amplification by using high-efficiency amplifiers. This paper 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 resulting in system EVM -29.21 dB with 64-QAM OFDM signals, and the performance can meet the requirements specified in IEEE 802.11a.