Unified mixed radix 2-4 redundant CORDIC processor

Abstract

We present a unified mixed radix CORDIC algorithm with carry-save arithmetic with a constant scale factor. The pipelined architecture of the processor is determined by a unique sequence of microrotations for the two modes of operation (rotation and vectoring) in circular and hyperbolic coordinates. The combination of radix-2 and radix-4 microrotations allows us to reduce the latency and size of the pipeline significantly. The unified algorithm is based on the correcting microrotation method, which we have extended to the vectoring mode in hyperbolic coordinates. We have also generalized the use of radix-4 microrotations to the two operation modes and coordinate systems.