상세정보
학술지
A Numerically Controlled Oscillator with a Fine Phase Tuner and a Rounding Processor
- 저자
- 임인기, 김환우
- 발행일
- 200412
- 출처
- ETRI Journal, v.26 no.6, pp.657-660
- ISSN
- 1225-6463
- 출판사
- 한국전자통신연구원 (ETRI)
- 협약과제
- 04MB3100, H/W로 재구성 가능한 차세대 지능형 통합단말용 SoC(차세대 통합 휴대 단말 기술), 조경익
- 초록
- We propose a fine phase tuner and a rounding processor for a numerically controlled oscillator (NCO), yielding a reduced phase error in generating a digital sine waveform. By using the fine phase tuner presented in this paper, when the ratio of the desired sine wave frequency to the clock frequency is expressed as a fraction, an accurate adjustment in representing the fractional value can be achieved with simple hardware. In addition, the proposed rounding processor reduces the effects of phase truncation on the output spectrum. Logic simulation results of the NCO using these techniques show that the noise spectrum and mean square error (MSE) for eight output bits of a 3.125 MHz sine waveform are reduced by 8.68 dB and 5.5 dB, respectively, compared to those of the truncation method, and 2.38 dB and 0.83 dB, respectively, compared to those of Paul's scheme.
- KSP 제안 키워드
- Clock frequency, Logic simulation, Noise spectrum, Output spectrum, Wave frequency, mean square error(MSE), numerically controlled oscillator(NCO), phase error, phase truncation, simulation results, sine waveform