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A unified and division-free CORDIC argument reduction method with unlimited convergence domain including inverse hyperbolic functions.

: Hahn, H.; Timmermann, D.; Hosticka, B.J.; Rix, B.


IEEE transactions on computers 43 (1994), Nr.11, S.1339 - 1344
ISSN: 0018-9340
Fraunhofer IMS ()
Arithmetik; computer arithmetic; convergence domain; CORDIC; Konvertierung; multiplier; Vervielfacher; VLSI; VLSI-Schaltung

One of the main problems of the CORDIC algorithm is the limited convergence domain, in which the functions can be calculated. Two different approaches can be employed to overcome this constraint: first, an argument reduction method and, second, an expansion of the CORDIC convergence domain. While the first approach requires significant processing overhead due to the need for divisions especially for arctanh, the second techniqueachieves an increased but still limited convergence domain only. In this brief contribution, we present a unified division-free argument reduction method and a regular pipeline/array architecture for floating point or fixed point implementations which results in savings of computation time. In contrast to previous methods we avoid extra CORDIC arithmetic for realization of argument reduction.