ETRI Journal

Electronics and Telecommunications Research Institute (한국전자통신연구원)
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An Area Optimization Method for Digital Filter Design

  • Yoon, Sang-Hun (Department of Electronic Engineering, Hanyang University) ;
  • Chong, Jong-Wha (Department of Electronic Engineering, Hanyang University) ;
  • Lin, Chi-Ho (Department of Computer Science, Semyung University)
  • Received : 2004.02.25
  • Published : 2004.12.31
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Abstract

In this paper, we propose an efficient design method for area optimization in a digital filter. The conventional methods to reduce the number of adders in a filter have the problem of a long critical path delay caused by the deep logic depth of the filter due to adder sharing. Furthermore, there is such a disadvantage that they use the transposed direct form (TDF) filter which needs more registers than those of the direct form (DF) filter. In this paper, we present a hybrid structure of a TDF and DF based on the flattened coefficients method so that it can reduce the number of flip-flops and full-adders without additional critical path delay. We also propose a resource sharing method and sharing-pattern searching algorithm to reduce the number of adders without deepening the logic depth. Simulation results show that the proposed structure can save the number of adders and registers by 22 and 26%, respectively, compared to the best one used in the past.

Keywords

References

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