高精度可编程信号发生器的设计与实现

随着集成电路的发展,现代物理电子设备的仿真、测试、检测和维护过程中,经常需要使用到高精度的信号发生器。传统意义上的信号发生器主要利用振荡器产生信号,但振荡器的精度不高成为了限制其应用范围的瓶颈。所以为了解决高精度的需求,本文利用频率合成的技术,提出了一种基于Sigma-Delta数模转换器(Digitalto Analog Converter,DAC)的可编程高精度信号发生器的设计与实现方法。经过实际测量,设计的信号发生器信噪比(Signal-to-NoiseRatio,SNR)好于110dB,总谐波失真(Total Harmonic Distortion,THD)小于-110dB,支持单端和...

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Bibliographic Details
Published in核技术 Vol. 37; no. 7; pp. 43 - 46
Main Author 潘金云 武杰 刘列峰 孙刘洋
Format Journal Article
LanguageChinese
Published 中国科学技术大学近代物理系 合肥230026 2014
中国科学技术大学核探测技术与核电子学国家重点实验室 合肥230026
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ISSN0253-3219
DOI10.11889/j.0253-3219.2014.hjs.37.070402

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Summary:随着集成电路的发展,现代物理电子设备的仿真、测试、检测和维护过程中,经常需要使用到高精度的信号发生器。传统意义上的信号发生器主要利用振荡器产生信号,但振荡器的精度不高成为了限制其应用范围的瓶颈。所以为了解决高精度的需求,本文利用频率合成的技术,提出了一种基于Sigma-Delta数模转换器(Digitalto Analog Converter,DAC)的可编程高精度信号发生器的设计与实现方法。经过实际测量,设计的信号发生器信噪比(Signal-to-NoiseRatio,SNR)好于110dB,总谐波失真(Total Harmonic Distortion,THD)小于-110dB,支持单端和差分输出,同时便携稳定。精度方面远高于市面上可以买到的信号发生器。
Bibliography:Signal generator, Programmable, Sigma-Delta modulator, High-resolution
Background: With the development of integrated circuits, the high-precision signal generator is always used in the process of simulation, testing, inspection and maintenance of electronic equipment in modem physics. The traditional signal generator generates signal by using oscillator, but the precision of oscillator is not high enough which becomes a bottleneck limiting the scope of application. Purpose: The aim is to address the needs of high-precision of signal generator, and design a programmable high-resolution signal generator. Methods: The direct digital frequency synthesizer technique and Sigma-Delta Digital to Analog Converter (DAC) were adopted to design this proposed high-precision signal generator. Digital chips CS5376 and CS4373 were employed together with the CompaetRIO DAC to achieve the target of 110 dB signal-to-Noise Ratio (SNR) and -110 dB Total Harmonic Distortion (THD). Programmable waveform was prepared in the mainfram
ISSN:0253-3219
DOI:10.11889/j.0253-3219.2014.hjs.37.070402