  Current and upcoming communication and sensing technologies require ever
larger bandwidths. Channel bonding can be utilized to extend a receiver's
instantaneous bandwidth beyond a single converter's Nyquist limit. Two
potential joint front-end and converter design approaches are theoretically
introduced, realized and evaluated in this paper. The Xilinx RFSoC platform
with its 5 GSa/s analog to digital converters (ADCs) is used to implement both
a hybrid coupler based in-phase/quadrature (I/Q) sampling and a
time-interleaved sampling approach along with channel bonding. Both
realizations are demonstrated to be able to reconstruct instantaneous
bandwidths of 5 GHz with up to 49 dB image rejection ratio (IRR) typically
within 4 to 8 dB the front-ends' theoretical limits.
