직접 디지털 주파수합성기의 ROM 크기를 줄이는 새로운 방식

A New Method to Reduce the Size of the ROM in Direct Digital Frequency Synthesizers

In this paper, a new method to reduce the size of ROM in the direct digital frequency synthesizer (DDFS) is proposed. In the case that ROM is used for sinusoidal value calculation, reducing the size of ROM is significant. So the power consumption is affected mostly by its bit width. In the proposed method, the ROM bit width is reduced by 1 bit using the phase subtraction and the approximation. The spurious level is better than 80㏈c and the power consumption estimated is 510㎼/MHz.