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Erratum to: Exact analysis of spurious signals in direct digital frequency synthesizers due to amplitude quantization
2009
Journal of Electronics (China)
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An extra right bracket in Eq.(3), the correct form of Eq.(3) is given below: ...
doi:10.1007/s11767-009-1002-6
fatcat:ujgocvqd3nedvapirmnoukj2x4
Efficient FPGA Implementation of Direct Digital Frequency Synthesizer for Software Radios
2012
International Journal of Computer Applications
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In this paper an efficient approach is presented to design and implement Direct Digital Frequency Synthesizer (DDFS) with high speed and spectral purity for wireless applications like Software Defined ...
The implementation is based upon efficient utilization of embedded slices and LUT's of the target device to enhance the speed of the proposed design. ...
In SDR transceiver Direct Digital Frequency Synthesizer (DDFS) is a well known technique for the generation of sinusoidal waveform reconfigurably [1] [3] . ...
doi:10.5120/4645-6714
fatcat:dzcarph6xrhhlphhynjklgulre
Spur-reduced digital sinusoid synthesis
1995
IEEE Transactions on Communications
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Communications SystemsResearch Section This article presents and analyzes a technique for reducing the spurious signal content in digital sinusoid synthesis. ...
Amplitude dithering allows the use of less complicated multipliers and narrower data paths in purely digital applications, as well as the use of coarse-resolution, highly linear digital-to-analog converters ...
Flanagan was supported in part by a National Science Foundation Fellowship. ...
doi:10.1109/26.392968
fatcat:osu63rnmnfbprh522xbuohnn7u
Periodic Wave Generation for Direct Digital Synthesization
2016
International Journal on Intelligent Electronic Systems
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Among the all-digital approaches, Direct Digital frequency synthesis is considered as main. The main objective of this paper is to improve the output signal quality. ...
But in this paper, there are two stage of task is applied with two different quantization methods for improving the accuracy in terms of signal Synthesization. ...
It is further classified into Direct Analogue Frequency Synthesization (DAFS) and Direct Digital Frequency Synthesization (DDFS) [1] . ...
doi:10.18000/ijies.30151
fatcat:ixhkwal4obhy7bcbqr3xs5ttya
A Nonlinear Fingerprint-Level Radar Simulation Modeling Method for Specific Emitter Identification
2021
Electronics
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In contrast to the previous single component modeling method, the systematic nonlinear characteristic modeling method of this model can provide individual radar signal data under different modulation modes ...
in the field of electronic reconnaissance. ...
Acknowledgments: We express our thanks to the editors and anonymous reviewers for their valuable comments.
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/electronics10091030
doaj:e15d7f5b19da4145aa4e0c0a48ded12e
fatcat:rz6yvtt2inaypa434tc7cz5l7i
Fractional-N Direct Digital Frequency Synthesis with a 1-Bit Output
2006
2006 IEEE MTT-S International Microwave Symposium Digest
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Large tuning ranges and rapid (open loop) response characteristics are achieved with only a static reference frequency input, without the use of analog components, allowing easy integration in digital ...
A novel digital frequency synthesis (DDS) architecture with a 1-bit output is proposed, simulated, and demonstrated. ...
SEGMENTED QUANTIZATION BASED FRACTIONAL-N DIRECT FREQUENCY SYNTHESIZER Here the segmented quantization system described above is demonstrated within the frequency synthesizer. ...
doi:10.1109/mwsym.2006.249559
fatcat:dluvs5shc5hhvc7wcgcek234pu
A 2.5-GHz Direct Digital Frequency Synthesizer with spurious noise cancellation
2014
IEICE Electronics Express
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A 2.5 GHz Direct Digital Frequency Synthesizer (DDS) with spurious noise cancellation is presented. ...
Measured performance is SFDR > 58 dB for output signal frequencies up to 1 GHz, more than 20 dB's improvement is achieved comparing to its intrinsic SFDR performance. ...
Introduction Direct Digital Frequency Synthesizer (DDS) has been widely used in communication and radar systems due to its advantages as high frequency resolution, fast frequency switching, wide tuning ...
doi:10.1587/elex.11.20140533
fatcat:u2csgou4xjh3fgpjiptprm22d4
A quadrature modulator based scheme for frequency hopping applications
2016
2016 International Conference on Applied Electronics (AE)
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Moreover the spurious signals resulting from the modulator is around -70 dBc, which is a lower value when compared to spurious signal performance of commercially available direct digital synthesis (DDS ...
Keywords -frequency hopping; digital up-conversion; quadrature modulator; phase locked loop; direct digital synthesis I. ...
The carrier signal is generated either by using a voltage controlled oscillator (VCO) whose tuning voltage is adjusted within the phase locked loop (PLL) or a direct digital frequency synthesizer (DDFS ...
doi:10.1109/ae.2016.7577280
fatcat:7udfog3tbvhn3gnroh35opti4a
End-to-End Direct Digital Synthesis Simulation and Mathematical Model to Minimize Quantization Effects of Digital Signal Generation
2020
IEEE Open Journal of the Communications Society
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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. ...
Signal generation using an all-digital architecture is also called direct digital synthesis, and the DDS architecture has been adopted by various industries. ...
doi:10.1109/ojcoms.2020.3027974
fatcat:7jcshs6k5fdmpc63tpur2paxei
A new method of spur reduction in phase truncation for DDS
2008
IEICE Electronics Express
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DDS (Direct digital synthesizer) is widely used for frequency synthesis. The factors that contribute to spurious signals are analyzed. ...
The experimental result indicates that the spurious signal due to phase truncation can be reduced 8 dBc at least. ...
Introduction DDS is a new frequency synthesis technique which is the most widely used in frequency synthesizers, especially in fast agile frequency synthesizer systems. ...
doi:10.1587/elex.5.915
fatcat:tbnru46v35emxcgxcx2kzzvnpe
Direct Digital Frequency Synthesis
[chapter]
2012
Embedded SoPC Design with Nios II Processor and Verilog Examples
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Quantization errors Since we use finite arithmetic to represent the signals in the DDFS, there is always some quantization error, which generates spurious signals. ...
The errors and the corresponding spurious frequencies produced have been studied extensively. A mathematical model of a direct digital synthesizer is shown in Figure 2 .6 ([8], [9] , [10] ). ...
doi:10.1002/9781118309728.ch23
fatcat:34isdoprsjatnieejsadbdnkuq
A Direct Digital Frequency Synthesizer With Fourth-Order Phase Domain$DeltaSigma$Noise Shaper and 12-bit Current-Steering DAC
2006
IEEE Journal of Solid-State Circuits
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This paper presents a direct digital frequency synthesizer (DDFS) with a 16-bit accumulator, a fourth-order phase domain single-stage 16 interpolator, and a 300-MS/s 12-bit current-steering DAC based on ...
The measured DDFS spurious-free dynamic range (SFDR) is greater than 78 dB using a reduced ROM with 8-bit phase, 12-bit amplitude resolution and a size of 0.09 mm 2 . ...
ACKNOWLEDGMENT The authors would like to thank X. Geng for his contribution to the DAC design. ...
doi:10.1109/jssc.2006.870749
fatcat:q73m5gxnvzbjrbt23p7e3q2feq
PLL-based fractional-N frequency synthesizers
2005
Fifth International Workshop on System-on-Chip for Real-Time Applications (IWSOC'05)
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Recent trends in the commercial use of fractional-N frequency synthesis can be attributed to the characteristic of independent loop bandwidth-channel spacing that results in low phase noise and relaxes ...
This paper reviews several techniques used to implement fractional-N frequency synthesizers and discusses the advantages and disadvantages. It also addresses design options and associated trade-offs. ...
Non-linearities due to the PD dead-zone and the charge-pump modulate high frequency quantization noise into the signal bandwidth. ...
doi:10.1109/iwsoc.2005.91
dblp:conf/iwsoc/ZarkeshvariNK05
fatcat:de57zcgherbivhfglfb23zu7ye
A 1.5-V direct digital synthesizer with tunable delta-sigma modulator in 0.13-/spl mu/m CMOS
2005
IEEE Journal of Solid-State Circuits
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INTRODUCTION T ABLE I shows spurious free dynamic ranges (SFDRs) to Nyquist frequency in recently published direct digital synthesizers (DDSs) and D/A converters [1] - [6] . ...
DIRECT DIGITAL SYNTHESIZER WITH TUNABLE MODULATOR The DDS with a tunable modulator is shown in a simplified form in Fig. 1 . ...
doi:10.1109/jssc.2005.848140
fatcat:xuxaafqvirchhhwodhhs5hs7j4
Optimizing frequency synthesizer performance based on passive adder entrenched technique for 4G communication systems
2022
Bulletin of Electrical Engineering and Informatics
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The suggested PAE frequency synthesizer for the application of WCDMA reduces noise exact effectively, according to simulation findings. With this synthesizer, the in-band phase noise is -75 dBc/Hz. ...
It is then suggested that the addition of a passive adder before the modulator's quantizer to eradicate any distortions created as a result of the quantization stage. ...
ANALYSIS DELTA-SIGMA FREQUENCY SYNTHESIZER MODULATOR ARCHITECTURE The PAE is an independent frequency synthesizer, often known as a digital-to-frequency converter or a direct digital period synthesizer ...
doi:10.11591/eei.v11i2.3196
fatcat:keiuwtgadvc6vmuylhbody666m
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