CORDIC rotator for frequency translation

Abstract

This paper presents a digital frequency translation by the CORDIC rotator (COordinate Rotation DIgital Computer) which does not require a complex multiplier and a phase-to-exponent converter. The CORDIC algorithm overview and detailed implementation architecture are presented. The architecture is fitted to implementation in high speed designs and using in Application-Specific Integrated Circuits (ASIC) or Field Programmable Gate Arrays (FPGA). The simulation results demonstrate the performance of proposed frequency translator in terms of Normalized Mean-Square Error (NMSE) and spectral purity. The proposed architecture requires about 79 times less resources compared to the conventional approach with a complex multiplier and Numerically Controlled Oscillator (NCO) at the same level 98 dB of Spurious Free Dynamic Range (SFDR).