  Efforts with extreme-precision radial velocity (EPRV) instruments to detect
small-amplitude planets are largely limited, on many timescales, by the effects
of stellar variability and instrumental systematics. One avenue for
investigating these effects is the use of small solar telescopes which direct
disk-integrated sunlight to these EPRV instruments, observing the Sun at high
cadence over months or years. We have designed and built a solar feed system to
carry out "Sun-as-a-star" observations with NEID, a very high precision Doppler
spectrometer recently commissioned at the WIYN 3.5m Telescope at Kitt Peak
National Observatory. The NEID solar feed has been taking observations nearly
every day since December 2020; data is publicly available at the NASA Exoplanet
Science Institute (NExScI) NEID Solar Archive:
\url{https://neid.ipac.caltech.edu/search_solar.php}. In this paper, we present
the design of the NEID solar feed and explanations behind our design intent. We
also present early radial velocity (RV) results which demonstrate NEID's RV
stability on the Sun over 4 months of commissioning: 0.66~m/s RMS under good
sky conditions and improving to 0.41~m/s RMS under best conditions.
