Redundant CORDIC Methods with a Constant Scale Factor for Sine and Cosine Computation

Proposes two redundant CORDIC (coordinate rotation digital computer) methods with a constant scale factor for sine and cosine computation, called the double rotation method and the correcting rotation method. In both methods, the CORDIC is accelerated by the use of a redundant binary number representation, as in the previously proposed redundant CORDIC. In the proposed methods, since the number of rotation-extensions performed for each angle is a constant, the scale factor is a constant independent of the operand. Hence, one does not need to calculate the scale factor during the computation, and can make a more efficient sine and cosine generator than that based on the previous redundant CORDIC. >