Issue No.08 - August (1997 vol.46)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/12.609275
<p><b>Abstract</b>—Traditionally, CORDIC algorithms have employed radix-2 in the first n/2 microrotations (n is the precision in bits) in order to preserve a constant scale factor. In this work, we will present a full radix-4 CORDIC algorithm in rotation mode and circular coordinates and its corresponding selection function, and we will propose an efficient technique for the compensation of the nonconstant scale factor. Three radix-4 CORDIC architectures are implemented: 1) a word serial architecture based on the zero skipping technique, 2) a pipelined architecture, and 3) an application specific architecture (the angles are known beforehand). The first two are general purpose implementations where redundant (carry-save) or nonredundant arithmetic can be used, whereas the last one is a simplification of the first two. The proposed architectures present a good trade-off between latency and hardware complexity when compared with already existing CORDIC architectures.</p>
CORDIC algorithm, radix-4, redundant arithmetic, VLSI architectures, pipelined architectures.
Elisardo Antelo, Julio Villalba, Javier D. Bruguera, Emilio L. Zapata, "High Performance Rotation Architectures Based on the Radix-4 CORDIC Algorithm", IEEE Transactions on Computers, vol.46, no. 8, pp. 855-870, August 1997, doi:10.1109/12.609275