Giehl, SebastianSebastianGiehlAndrich, CarstenCarstenAndrichSchubert, MichaelMichaelSchubertEngelhardt, MaximilianMaximilianEngelhardtIhlow, AlexanderAlexanderIhlow2023-09-062023-09-062023https://publica.fraunhofer.de/handle/publica/45029410.23919/EuCAP57121.2023.101332622-s2.0-85162204839Current 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.enBandwidth extensionchannel bondinghybrid couplerI/Q samplingsample interleavingconference paper