Single Filter Frequency Masking High-Speed Recursive Digital Filters |
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Authors: | Oscar Gustafsson Håkan Johansson and Lars Wanhammar |
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Affiliation: | (1) Department of Electrical Engineering, Linköping University, Sweden |
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Abstract: | For recursive filter the maximal sample frequency is bounded by the recursive
loops in the filter. In this paper, it is understood that recursive filters are infinite-length impulse response (IIR)
filters.] In this work, a filter structure based on the use of the frequency masking
approach is presented that increases the maximal sample frequency for narrowband and
wideband filters by introducing more delay elements in the recursive loops. By using
identical subfilters (except for the periods), the subfilters can be mapped using folding
to a single pipeline/interleaved arithmetic structure yielding an area-efficient implementation.
The filters are potentially suitable for low-power implementation by using power
supply voltage scaling techniques. In this work, the design of the filters is discussed and
estimations of the ripples are derived. Two examples show the viability of the proposed
method. |
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