Counter Based Numerically Controlled Oscillator - A New Architecture

The paper is about a new architecture for NCO different from the conventional LUT (Look Up Table)-based architecture. The key difference in this technique, as compared to other well known approaches, is the incorporation of non-uniform sampling intervals so that the amplitude values of the sinusoidal signal are uniformly spaced. The advantages of this method are that output frequency range can be increased without altering the design and any re-computation. Also the number of samples within the signal remains constant irrespective of the output frequency of the signal. This approach saves in hardware and is comparable to other approaches with respect to the accuracy of the signal reproduced.