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Comments on 'A 70 MHz Multiplierless FIR Hilbert Transformer in 0.35 µm Standard CMOS Library'
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/03/01
Online ISSN: 1745-1337
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: VLSI Design Technology and CAD
carry-save arithmetic, common subexpression elimination (CSE), multiple constant multiplication (MCM), FIR filters,
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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. does not achieve any complexity reduction in practice.