Implementation of Numerically Controlled Oscilator that usesDe Moivre Identity and Trigonometric Relations


23nd Signal Processing and Communications Applications Conference (SIU), Malatya, Turkey, 16 - 19 May 2015, pp.1643-1646 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • City: Malatya
  • Country: Turkey
  • Page Numbers: pp.1643-1646
  • Eskisehir Osmangazi University Affiliated: Yes


Due to stability and controllability properties, table-based structures are preferred in numerically controlled oscillators which have important roles in digital communication systems. This work proposes a circuit that uses De Moivre and sum of angles trigonometric identities, combining a typical table driven by angle increments and De Moivre oscillator output, consequently generating more precise/accurate output with less memory requirement. Output samples of a constant frequency De Moivre oscillator are used in interpolation of intermediate values using the table, and since the table is driven by the accumulator, frequency controlled sine/cosine signal pair is obtained. Simulation results and spectrum characteristics are presented and the applicability of the method is demonstrated.