Pseudo-random Direct Sampler for Frequency Down-Conversion in a Multi-standard Receiver

Abstract

For software defined radio, non uniform sampling (NUS) is a process promising IF down-conversion with alias reduction. Applied to multi-standard receiver, this technique relaxes system design constraints. This paper presents a new design strategy for clock generation in NUS based multi-standard radio receiver supporting GSM, UMTS and Wi-Fi standards. Sampling frequency choice is discussed in order to get only one shared anti-aliasing filter suitable for all considered standards. The proposed non uniform clock generator, the pseudo-random direct sampler (PDS), promises a direct driving of the sampler circuit leading to low-power oriented design regarding classic RF sampling receiver.