直接數(shù)字波形合成中的鏡頻干擾分析
On The Mirror Image Interference in Direct Digital Waveform Synthesis
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摘要: 該文針對(duì)數(shù)字波形合成信號(hào)中的鏡頻干擾問(wèn)題展開討論，著重分析了鏡頻的形成機(jī)理及分布特點(diǎn)，說(shuō)明了采樣率對(duì)鏡頻干擾的影響。在此基礎(chǔ)上定量分析了產(chǎn)生鏡頻干擾的采樣率條件，并通過(guò)實(shí)驗(yàn)結(jié)果驗(yàn)證。該分析結(jié)果為數(shù)字波形合成中的采樣率選取提供了新的理論依據(jù)。
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關(guān)鍵詞:
- 直接數(shù)字波形合成;采樣率;鏡頻
Abstract: This paper discusses the mirror image interference in direct digital waveform synthesis. The formation and distribution characteristics of mirror images are illuminated, and the impact of sampling rate which brings mirror image interference is analyzed. Based on these, the condition of sampling rate which results in mirror image interference is concluded and proved by experiment. The conclusion provides new theoretical basis on sampling rate selection in digital waveform synthesis. -
Reinhardt V S. Spur reduction techniques in direct digital synthesizers. Proc. IEEE International Frequency Control Symp., Salt Lake City, U.S.A, June 2-4, 1993: 230-241.[2]Calbaza D E, Savaria Y. Jitter model of direct digital synthesis clock generators. Proc. IEEE International Circuits and Systems Symp., Orlando, Florida, May 30-June 2, 1999, (1), 1-4.[3]Nicholas H T, Samueli H. An analysis of the output spectrum of direct digital frequency synthesizer in the presence of phase accumulator truncation. Proc. 41st Annual Frequency Control Symp., USERACOM, Ft. Monmouth, NJ, May 1987: 495-502.[4]Perez-Alcazar P R, Santos A. Relationship between sampling rate and quantization noise. 14th International Conference on Digital Signal Processing, 2002(2), Aegean Island of Santorini, Greece,July 1-3: 807-810.[5]李春明,孫圣和.數(shù)/模轉(zhuǎn)換器輸出毛刺對(duì)數(shù)字合成信號(hào)影響的分析及其消除方法.儀器儀表學(xué)報(bào),1996,17(6):561-565. -
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