Pre-computation of rotation bits in unidirectional CORDIC for trigonometric and hyperbolic computations

A novel technique for the pre-computation of rotation bits for unidirectional CORDIC is proposed in this paper. The unidirectional CORDIC algorithms differ from the conventional CORDIC in the degree of rotation. A new technique is developed to pre-compute the rotation bits from any given angle. The hardware design VLSI circuit is implemented in a FPGA using Altera Quartus II VHDL. Experimental results obtained with computations of trigonometric and hyperbolic functions using the pre-computed bits show the accuracy results in the order of ∼10^-8.