Discrete-Time receivers for software-defined radio: challenges and solutions


Ru, Zhiyu and Klumperink, Eric A.M. and Nauta, Bram (2007) Discrete-Time receivers for software-defined radio: challenges and solutions. In: ProRISC 2007, 18th Annual Workshop on Circuits, Systems and Signal Processing, 29-30 November 2007, Veldhoven, the Netherlands (pp. pp. 73-77).

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Abstract:Abstract—CMOS radio receiver architectures, based on radio frequency (RF) sampling followed by discrete-time (DT) signal processing via switched-capacitor circuits, have recently been proposed for dedicated radio standards. This paper explores the suitability of such DT receivers for highly flexible softwaredefined radio (SDR) receivers. Via symbolic analysis and simulations we analyze the properties of DT receivers, and show that at least three challenges exist to make a DT receiver work for SDR: 1) the sampling clock frequency is related to the radio frequency, complicating baseband filter design; 2) a frequencydependent phase shift is introduced by pseudo-quadrature and pseudo-differential sampling; 3) the conversion gain of a charge sampling front-end is strongly frequency-dependent. Some potential solutions are also suggested for each challenge. Compared to a mixer based radio receiver, extra costs are
needed to solve these problems.
Item Type:Conference or Workshop Item
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/64391
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