FPGA Implementation of Low Phase Noise Oscillator

Many DSP applications require a complex sinusoid to accomplish various signal rotation tasks. Examples include the discrete, fast Fourier transforms and digital up/down conversions. This article presents a complex oscillator based on the unfolded CORDIC algorithm and produces periodic sine and cosine samples for any specified angle increment. Low phase noise is achieved by residual angle correction unit and stability is achieved using AGC unit. The simulation and synthesis results in FPGA are presented. Fourier analysis of the output using MATLAB is also presented.