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Abstract
Ultra wideband technology ( UWB) was approved by the fcc in 2002 and has since drawn a considerable attention for a variety of applications including wireless communications, radar imaging and vehicular radar implementing an all-digital UWB receiver has numerous benefits ranging from CMOStechnology scaling scaling,low cost,ease of design to flexibility on the other hand digital receivers require analog -to-digital converters (ADCs) sampling at nyquist rate which is non trivial problem flash ADCs .