A ROM-Less Direct Digital Frequency Synthesizer Based on Bezier Curve Approximation
Author(s) : C BHATTACHARYA, KATHIKA ROY, RAVINDER SINGH
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 7.9×10-6, 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.
No fo Author(s) : 3
Page(s) : 95 - 89
Electronic ISSN : 2278 - 215x
Volume 2 :
Issue 2
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