Abstract: “This paper describes the design and implementation of a ROM-Less Direct Digital Frequency Synthesizer (DDS) using Bezier curve approximation. With Bezier curve approximation, phase values between 0 to π are mapped to sine amplitudes. Then, half wave symmetry of sine wave is exploited to construct full sine wave. The proposed approximation introduces maximum error of 7.9x10-6, which is equivalent to quantized sinusoid with 16-bit amplitude resolution. This yields very high spectrally pure sine wave output. Based on the approximation, DDS circuit is designed and validated in Matlab-Simulink”

Keywords: Direct Digital Frequency Synthesizer, ROM- Less DDS, Bezier curve approximation