CORDIC UNIT

摘要

The invention relates to a CORDIC unit for iterative approximation of a vector rotation about an angle of rotation theta by a number of elementary rotations about elementary angles alpha¿i<, comprising elementary rotation stages, each for carrying out an elementary rotation about an elementary angle alpha¿i? as an iterative step in the iterative approximation. After one such elementary rotation there remains a residual angle about which it remains to be turned. The elementary rotation stages of said CORDIC unit are embodied for the rotation about elementary angle alpha¿1?, given by a power of two with a negative whole-numbered exponent. Said CORDIC unit further comprises a trigger device for triggering the elementary rotation which is embodied such as to compare the residual angle with at least one of the elementary angles before each iteration step and to exclude such elementary rotation steps with an elementary angle greater than the residual angle. In comparison with conventional CORDIC units, process steps can be omitted with such an embodiment of said CORDIC unit, thus reducing the activity of the total circuit and thereby the energy consumption thereof.