Abstract
We present a new technique to the design of high spectral purity numerically controlled oscillator (NCO). In this work, a single look up table (LUT) with sine amplitudes at equally spaced samples was used to approximate the complete sine wave cycle. A simple computation process has been conducted to evaluate the slope coefficients, thus the LUT for mapping those values is eliminated. As a result the NCO structure has been efficiently simplified and the memory reduction has resulted in noticeable logic element (LE) saving. The proposed NCO has been simulated using Xilinx toolbox within the MATLAB Simulink environment. It is shown that the spurious free dynamic range (SFDR) of 96 dBc has been achieved and a compression ratio of 256:1 was attained.
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