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The Journal of The Korea Institute of Intelligent Transport Systems Vol.6 No.2 pp.126-137
차동 양자화를 사용한 병렬 방식의 직접 디지털 주파수 합성기
The Direct Digital Frequency Synthesizer of Parallel Type Using the Differential Quantization
Abstract
In this paper, a new method to reduce the size of ROM in the direct digital frequency synthesizer(DDFS) is proposed. And we design the phase-to-sine converter using the phase accumulator of parallel type for generating the high frequency. The new ROM compression method can reduce the ROM size by using the two ROM. The quantized value of sine is saved by the quantized-ROM(Q-ROM) and the differential ROM(D-ROM). So the total size of the ROM in the proposed DDFS is significantly reduced compared to the original ROM. The ROM compression ratio of 67.5% is achieved by this method. Also, the power consumption is decreased according to the ROM size reduction.
