  This contribution proposes a two stage strategy to allow for phase retrieval
in state of the art sub-Nyquist sampling schemes for sparse multiband signals.
The proposed strategy is based on data acquisition via modulated wideband
converters known from sub-Nyquist sampling. This paper describes how the
modulators have to be modified such that signal recovery from sub-Nyquist
amplitude samples becomes possible and a corresponding recovery algorithm is
given which is computational efficient. In addition, the proposed strategy is
fairly general, allowing for several constructions and recovery algorithms.
