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Well-Structured Modified Booth Multiplier and Its Application to Reconfigurable MAC Design
Li-Rong WANG Ming-Hsien TU Shyh-Jye JOU Chung-Len LEE
IEICE TRANSACTIONS on Electronics
Publication Date: 2011/06/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
multiplier, multiply-accumulator, modified Booth encoding, reconfigurable, mixed-Vt, standard cell library,
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This paper presents a well-structured modified Booth encoding (MBE) multiplier which is applied in the design of a reconfigurable multiply-accumulator (MAC) core. The multiplier adopts an improved Booth encoder and selector to achieve an extra-row-removal and uses a hybrid approach in the two's complementation circuit to reduce the area and improve the speed. The multiplier is used to form a 32-bit reconfigurable MAC core which can be flexibly configured to execute one 3232, two 1616 or four 88 signed multiply-accumulation. Experimentally, when implemented with a 130 nm CMOS single-Vt standard cell library, the multiplier achieved a 15.8% area saving and 11.7% power saving over the classical design, and the reconfigurable MAC achieved a 4.2% area and a 7.4% power saving over the MAC design published so far if implemented with a mixed-Vt standard cell library.