  The Darwin and TPF-I missions are Infrared free flying interferometer
missions based on nulling interferometry. Their main objective is to detect and
characterize other Earth-like planets, analyze the composition of their
atmospheres and their capability to sustain life, as we know it. Darwin and
TPF-I are currently in study phase. A number of mission architectures of 3 and
4 free flying telescopes are evaluated on the basis of the interferometer's
response, ability to distinguish multiple planet signatures and starlight
rejection capabilities. The characteristics of the new configurations are
compared also to the former, more complex Bowtie baseline architectures as well
as evaluated on base of their science capability.
