数字(DDS-和Trueform-)发生器计量性能的研究

IF 0.1 Q4 INSTRUMENTS & INSTRUMENTATION
Y. Pavlenko, S. Kirienko, V. Ogar, Olena Vаsileva
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引用次数: 0

摘要

摘要调频振荡频率偏差测量标准的一个根本改进是,基于直接数字合成(DDS)原理及其下一版本的Trueform技术,用数字发生器取代了DETU 09-03-95中使用的模拟调频发生器。这些发生器具有比模拟发生器更宽的频率偏差和调制频率范围,但频率调制的非线性失真规律并没有标准化。本文的主题是开发这些发生器的方法和研究,以及由它们产生的用于非线性失真、伴随的幅度调制和频率噪声的调频信号。研究中使用了三种方法:直接测量;“组合频率”和“频移”。实验是使用几种测量方法进行的,这些方法可以估计非常小的非线性失真值。开发了方法,并对DDS发生器(在频率调制模式下)的伴随幅度调制及其频率噪声水平进行了实验估计。对具有K7选项的R&S FSL6频谱分析仪的模数解调器的性能进行了实验评估,显示了其高线性,并评估了其对载波振荡和频率偏差的频率范围的能力。研究结果为在参数未归一化的范围内(直流高达8MHz,F高达500kHz)使用K7选项校准频谱分析仪的DDS发生器和解调器的方法提供了基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Research of metrological capabilities of digital (DDS- and Trueform-) generators
Abstract One of the fundamental improvements of the measurement standard of frequency deviation of frequency-modulated oscillations was the replacement of analog frequency-modulated generators used in DETU 09-03-95 with digital ones based on the principle of direct digital synthesis (DDS) and its next version of Trueform technology. These generators have wider ranges of frequency deviation and modulation frequencies than analog ones, but nonlinear distortion laws of the frequency modulation are not standardized. The subject of the article is the development of methods and research of these generators and frequency-modulated signals generated by them for nonlinear distortions, accompanying amplitude modulation, frequency noise. Three methods were used in the study: direct measurement; “combination frequencies” and “frequency shift”. The experiment was performed using several measurement methods, which allowed to estimate very small values of nonlinear distortion. Methods were developed and experimental estimations of concomitant amplitude modulation of DDS-generators (in frequency modulation mode), as well as their frequency noise level, were performed. An experimental evaluation of the capabilities of the analog-digital demodulator of the R&S FSL6 spectrum analyzer with the K7 option was performed, its high linearity was shown, its capabilities with respect to the frequency ranges of carrier oscillations and frequency deviation were evaluated. The research results provide a basis for the method of calibration of DDS-generators and demodulator of spectrum analyzers with the K7 option in those ranges where their parameters are not normalized (at direct current up to 8 MHz and F up to 500 kHz).
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来源期刊
Ukrainian Metrological Journal
Ukrainian Metrological Journal INSTRUMENTS & INSTRUMENTATION-
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