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

Oscar GUSTAFSSON  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E91-A   No.3   pp.899-900
Publication Date: 2008/03/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e91-a.3.899
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: VLSI Design Technology and CAD
Keyword: 
carry-save arithmetic,  common subexpression elimination (CSE),  multiple constant multiplication (MCM),  FIR filters,  

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Summary: 
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.