The Digital Fields Board for the FIELDS instrument suite on the Solar Probe Plus mission: Analog and digital signal processing - Malaspina, DM; Ergun, RE; Bolton, M; Kien, M; Summers, D; Stevens, K; Yehle, A; Karlsson, M; Hoxie, VC; Bale, SD; Goetz, K (JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2016)