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This paper addresses the practical design issues of a multi-standard RF sub-sampling front-end. The system level design flow of a dual-standard sub-sampling receiver is provided with focus on two important design issues. The first critical design issue is the careful selection of the sampling rate and consequently the frequency plan of the receiver. This is done in this paper based on a novel proposed interfering profile. The second issue relates to the RF requirements of the sub-sampling receiver. By considering the system issues, multi-standard operation and interfering effects in a RF sub-sampling receiver supporting UMTS and WLAN, the receiver requirements have been derived based on the existing specifications. The proposed issues are theoretically analyzed and simulated. Furthermore, measurements are made on a designed and implemented sub-sampling receiver. The experimental results agree fully with theory and simulations.