LOW-POWER DIGITAL FREQUENCY-CONVERSION ARCHITECTURES

State-of-the-art data communication systems make extensive use of digi tal hardware. Besides baseband modulation functions, also the frequenc y tuning functions are now being shifted from analog to digital implem entation. Integration, cost and ease of programming are the primary mo tivations for doing this. This paper presents an alternative to the tr aditional digital frequency conversion architectures. The proposed arc hitecture achieves low power as well as high speed operation, and achi eves this dual goal by reducing programmability. A multi-rate filterin g approach is used, which is applicable for both upconversion and down conversion of quadrature modulated data.