Low Power Digital Frequency Conversion Architectures

Abstract

. State-of-the-art data communication systems make extensive use of digital hardware. Besides baseband modulation functions, also the frequency tuning functions are now being shifted from analog to digital implementation. Integration, cost and ease of programming are the primary motivations for doing this. This paper presents an alternative to the traditional digital frequency conversion architectures. The proposed architecture achieves low power as well as high speed operation, and achieves this dual goal by reducing programmability. A multi-rate filtering approach is used, which is applicable for both upconversion and downconversion of quadrature modulated data. 1. Introduction In recent years, digital broadband communication on access networks have gained major interest [13]. Such networks are for instance telephone twisted pair [7] and hybrid fiber-coax CATV [3]. The modems inside these networks need to operate in a strongly regulated environment and should not interfere in presen..