A polyphase comb filter using interlaying multiplexers for high-speed single-bit sigma-delta modulators

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Abstract

This paper proposes a new design for a Polyphase implementation of a third-order SINC filter (SINC3) with a decimation factor of 8. In order to make our solution more power efficient in comparison with the classical Polyphase filters, we use the counterclockwise commutator technique and, by applying a multiplexer interlaying strategy, we are able to implement a multiplier-free Polyphase structure. Moreover, by using properly defined control signals, our circuit takes advantage of dispatching input bit stream and navigating bits in the related sub-filters. High-level simulation results in MATLAB shows that our filter allows reaching a dynamic performance comparable to the ideal SINC3filter and, the corresponding implementation in a Xilinx Spartan3 FPGA demonstrates the feasibility and hardware efficiency of our solution. The proposed new filter architecture can be readily applicable to any Sigma-Delta ADC with a single-bit output stream and it requires a reduced number of adders and registers when compared with state-of-the-art approaches.
Original languageUnknown
Title of host publicationInternational Conference Mixed Design of Integrated Circuits and Systems (MIXDES)
Pages216-220
Publication statusPublished - 1 Jan 2011
EventMixed Design of Integrated Circuits and Systems (MIXDES), 2011 -
Duration: 1 Jan 2011 → …

Conference

ConferenceMixed Design of Integrated Circuits and Systems (MIXDES), 2011
Period1/01/11 → …

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