  For a squeezing-enhanced SU(2) interferometer, we theoretically investigate
the possibility to broaden the phase range of sub-shot-noise sensitivity. We
show that this goal can be achieved by implementing detection in both output
ports, with the optimal combination of the detectors outputs, leading to a
phase sensitivity independent of the interferometer operation point. Provided
that each detector is preceded by a phase-sensitive amplifier, this sensitivity
could be also tolerant to the detection loss.
