  AMIGO - The Astrodynamical Middle-frequency Interferometric GW
(Gravitation-Wave) Observatory is a first-generation mid-frequency GW mission
bridging the sensitivity gap between the high-frequency GW detectors and
low-frequency space GW detectors. In our previous works, we have obtained
appropriate heliocentric orbit formations of nominal arm length 10,000 km with
their first-generation time-delay configurations satisfying frequency noise
reduction requirement, and we have also worked out thrust-fuel friendly
constant-arm heliocentric orbit formations. In this paper, we review and study
noise requirements and present the corresponding GW sensitivities. From the
design white position noises and acceleration noises, we obtain the GW
sensitivities for the first-generation Michelson X TDI configuration of b-AMIGO
(baseline AMIGO), AMIGO, and e-AMIGO (enhanced AMIGO). In view of the current
technology development, we study and indicate steps to implement the AMIGO
mission concept.
