Design of 0.35-ps RMS Jitter 4.4–5.6-GHz Frequency Synthesizer with Adaptive Frequency Calibration Using 55-nm CMOS Technology

Qiu, Yusong; Zhao, Lei; Zhang, Feng

doi:10.1007/s00034-017-0645-z

Cited by 8 publications

(3 citation statements)

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“…The main methods of frequency synthesis in the contemporary era are direct analog frequency synthesis, indirect frequency synthesis and direct digital frequency synthesis [1]- [6]. Direct analog frequency synthesis is a method that generates frequencies by adding, subtracting and dividing one or more frequency reference sources using frequency doubling, frequency dividing and mixing methods.…”

Section: Introductionmentioning

confidence: 99%

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A Suppressing Method for Spur Caused by Amplitude Quantization in DDS

Tang

Hou

2019

IEEE Access

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Direct digital synthesis (DDS) technology is widely used in navigation, communications, aerospace, and other fields. Due to the technical limitations in the process of DDS digitization, the output spectrum of DDS is inevitably spurious. In order to meet the requirement of the pure frequency reference signal for modern instrument or equipment, it is necessary to correctly analyze the spur of DDS and effectively suppress it. In this paper, the causes of the spur in traditional DDS are analyzed, and a piecewise linear approximation method is proposed to suppress the amplitude quantization spur of DDS. In order to verify the effectiveness of the proposed spurious suppression method in this paper, the MATLAB simulation is carried out and a field programmable gate array (FPGA) hardware platform for DDS is developed. The simulation and actual test results prove the feasibility of this method. In the limited storage space, this method improves the accuracy of amplitude quantization, reduces spurs, and enhances the accuracy of synthetic frequency.

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Section: Introductionmentioning

confidence: 99%

“…There are usually two ways to design and implement frequency synthesizer based on DDS technology, using DDS chip or FPGA [6]- [8], [14]- [16]. Chip-based frequency synthesizers can achieve higher integration.…”

Section: Introductionmentioning

confidence: 99%

A Suppressing Method for Spur Caused by Amplitude Quantization in DDS

Tang

Hou

2019

IEEE Access

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“…Frequency synthesizer, as a common signal generator, has been widely applied in many fields. Related researches have more and more requirements for the accuracy and stability of the frequency synthesizer, especially in the fields of satellite positioning, aerospace, surveying and mapping, guidance and high-speed communication [1,2]. The signal generator is a kind of instrument with a long history.…”

Section: Introductionmentioning

confidence: 99%

An Accurate DDS Method Using Compound Frequency Tuning Word and Its FPGA Implementation

Yuqing

Tang

2018

Electronics

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Because of its high resolution, low cost, small volume, low power dissipation and less conversion time consumption, the direct digital synthesizer (DDS) method has been applied more and more in the fields of frequency synthesis and signal generation. However, only a limited number of precise frequency signals can be synthesized by the traditional DDS, for the reason that its accumulator modulus is fixed, and its frequency tuning word must be integer. In this paper, a precise DDS method using compound frequency tuning word is proposed, which improves the accuracy of synthesized signals at any frequency points on the premise of guaranteeing the stability of synthesized signals. In order to verify the effectiveness of the new method, a DDS frequency synthesizer based on FPGA is designed and implemented. Taking the rubidium atomic clock PRS10 as standard frequency source, the experiments shows that the frequency stability of the synthesized signal is better than 8.0 × 10−12/s, the relative frequency error is less than 4.8 × 10−12, and that the frequency accuracy is improved by three orders of magnitude compared with the traditional DDS method.

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