An FPGA-Based DDS-Synchronized Quadrature Lock-In Module for Sweep-Field Demodulation in a Single-Beam SERF Magnetometer. - Zhang, Dongjing; Hao, Xiaojian; Jia, Rui; Yu, Xinying; Fu, Yifei; Ma, Nengqiang; Cui, Zheming (Sensors (14248220), 2026)