A Suppressing Method for Spur Caused by Amplitude Quantization in DDS

Tang, Sheng; Li, Changlong; Hou, Yuqing

doi:10.1109/access.2019.2915677

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…(1) 0.1 (1) 2 (1) 6.9/channel (1) Structure LDAC (2) LDAC (2) NLDAC (2) Hybrid (2) LDA (2) No. of Channel −59 (4) −58 (4) −55.1 −52 −59.9 (4) Power 0.7 W@ 1 GHz (5) 1.9 W@ 1 GHz (5) 0.13 W@ 2 GHz (5) 0.35 W@ 1.3 GHz (5) 0.6 W/channel @1 GHz (5) (1) Including pads. (2) NLDAC, LDAC and Hybrid are the abbreviations of nonlinear DAC, linear DAC and hybrid DAC respectively.…”

Section: Measurement Results and Comparisonmentioning

confidence: 99%

“…The spurious-free dynamic range (SFDR) which is limited by the maximum spurs, is a key index of DDS [4]. There are multiple reasons that spurs exist, including the amplitude quantization [5], the truncating of the phase accumulator [6], digital-to-analog (D/A) conversion error and so on. The most significant spurs are usually generated during D/A conversion, mainly due to the non-linearity of DAC, the non-ideal characteristics of switches and the quantization error [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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An Automatic Clock-Induced-Spurs Detector Based on Energy Detection for Direct Digital Frequency Synthesizer

Lei

Zhang

Deng

et al. 2022

Sensors

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A clock-induced-spurs detector, composed of a programmable low-pass filter (LPF), energy detector and spur detection algorithm, is presented and applied to a four-channel 1 gigabit-samples-per-second (GSPS) direct digital frequency synthesizer (DDS). The proposed detector realizes the detection of spurs based on energy-detection, and the spur detection algorithm is adopted to automatically extract the amplitude and phase of clock-induced spurs, generated by the intermodulation of harmonic spurs and multiple clocks. Finally, the extracted features are sent to auxiliary DDS to decrease the target spur, following which the detector can be turned off to save power. Additionally, the detected characteristics under different output conditions can be read out through the interface for rapid frequency switching. The proposed detector integrated into a DDS is fabricated with a 65 nm complementary metal oxide semiconductor (CMOS) process and has an area of 190 μm × 320 μm. The measured power consumption is roughly 38 mW, consuming 6% that of a single-channel DDS. The test results show that the spurious-free dynamic range (SFDR) of this DDS can be successfully enhanced from −43.1 dBc to roughly −59.9 dBc without any off-chip instruments. This effectively proves that the detection accuracy of this detector can reach around −81 dBm.

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Section: Measurement Results and Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Automatic Clock-Induced-Spurs Detector Based on Energy Detection for Direct Digital Frequency Synthesizer

Lei

Zhang

Deng

et al. 2022

Sensors

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show abstract

“…The quantized form of a sinusoidal wave is stored in the LUT [16]. As a result, a signal is produced which resembles the ideal form of a sinusoidal wave and described by [17]…”

Section: Sine Output Ddsmentioning

confidence: 99%

“…The signal, from Equation (17), is quantized in phase and amplitude. Quantization causes spurious content to appear in the spectrum.…”

Section: B Amplitude Quantizationmentioning

confidence: 99%

End-to-End Direct Digital Synthesis Simulation and Mathematical Model to Minimize Quantization Effects of Digital Signal Generation

Patel

Martin

2020

IEEE Open J. Commun. Soc.

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Direct digital synthesis (DDS) architectures are becoming more prevalent as modern digitalto-analog converter (DAC) and programmable logic devices evolve to support higher bandwidths. The DDS architecture provides the benefit of digital control but at a cost of generating spurious content in the spectrum. The generated spurious content may cause intermodulation distortion preventing proper demodulation of the received signal. The distortion may also interfere with the neighboring frequency bands. This paper presents the various DDS architectures and explores the DDS architecture which provides the most digital reconfigurability with the lowest spurious content. End-to-end analytical equations, numerical and mathematical models are developed to determine the location and power levels of spurs. Afterwards, the analytical equations, numerical and mathematical models are shown to be consistent with the experimental data. A developer can use the information to design a DDS architecture that meets their minimum requirements.

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The development of high bandwidth arbitrary waveform generator based on ADA14S800

Li,

Zhang,

Wang

et al. 2024

Radiat Detect Technol Methods

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A Suppressing Method for Spur Caused by Amplitude Quantization in DDS

Cited by 6 publications

References 19 publications

An Automatic Clock-Induced-Spurs Detector Based on Energy Detection for Direct Digital Frequency Synthesizer

An Automatic Clock-Induced-Spurs Detector Based on Energy Detection for Direct Digital Frequency Synthesizer

End-to-End Direct Digital Synthesis Simulation and Mathematical Model to Minimize Quantization Effects of Digital Signal Generation

The development of high bandwidth arbitrary waveform generator based on ADA14S800

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