Comments on ‘A 70MHz Multiplierless FIR Hilbert Transformer in 0.35μm Standard CMOS Library’

Oscar GUSTAFSSON

doi:10.1093/ietfec/e91-a.3.899

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences

Online ISSN : 1745-1337
Print ISSN : 0916-8508

Regular Section

Comments on ‘A 70MHz Multiplierless FIR Hilbert Transformer in 0.35μm Standard CMOS Library’

Oscar GUSTAFSSON

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Keywords: carry-save arithmetic, common subexpression elimination (CSE), multiple constant multiplication (MCM), FIR filters

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2008 Volume E91.A Issue 3 Pages 899-900

DOI https://doi.org/10.1093/ietfec/e91-a.3.899

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Abstract

In this comment we point out that the mapping from carry-propagation adders to carry-save adders in the context of shift-and-add multiplication is inconsistent. Based on this it is shown that the implementation in Ref. [1] does not achieve any complexity reduction in practice.

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