Analysis and design of a direct digital-frequency synthesizer with matched differential output

Jian Ming Zhou

doi:10.3969/j.issn.1006-7043.2010.04.017

Analysis and design of a direct digital-frequency synthesizer with matched differential output

Jian Ming Zhou^*

^*Corresponding author for this work

School of Integrated Circuits and Electronics

Research output: Contribution to journal › Article › peer-review

Abstract

The even harmonics produced by a direct digital-frequency synthesizer (DDS) are excessive. To find a way to overcome this, the theoretical model of center-tapped transformers with differential current output DDS was analyzed. DDS output signals were then simulated. Imbalances between amplitude and phase of DDS output signals were found to increase even harmonics. In order to reduce even harmonics, a method for compensating for the imbalanced amplitude and phase of DDS output differential signals was proposed. The key to the method was the use of unbalanced differential loads. They were used to compensate for the imbalances caused by the DDS, the PCB board, and the transformer. The value of the method was verified by simulations and experimental results.

Original language	English
Pages (from-to)	507-512
Number of pages	6
Journal	Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University
Volume	31
Issue number	4
DOIs	https://doi.org/10.3969/j.issn.1006-7043.2010.04.017
Publication status	Published - Apr 2010

Keywords

Amplitude and phase compensation
Differential signal
Direct digital-frequency synthesizer
Spurs

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10.3969/j.issn.1006-7043.2010.04.017

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abstract = "The even harmonics produced by a direct digital-frequency synthesizer (DDS) are excessive. To find a way to overcome this, the theoretical model of center-tapped transformers with differential current output DDS was analyzed. DDS output signals were then simulated. Imbalances between amplitude and phase of DDS output signals were found to increase even harmonics. In order to reduce even harmonics, a method for compensating for the imbalanced amplitude and phase of DDS output differential signals was proposed. The key to the method was the use of unbalanced differential loads. They were used to compensate for the imbalances caused by the DDS, the PCB board, and the transformer. The value of the method was verified by simulations and experimental results.",

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AB - The even harmonics produced by a direct digital-frequency synthesizer (DDS) are excessive. To find a way to overcome this, the theoretical model of center-tapped transformers with differential current output DDS was analyzed. DDS output signals were then simulated. Imbalances between amplitude and phase of DDS output signals were found to increase even harmonics. In order to reduce even harmonics, a method for compensating for the imbalanced amplitude and phase of DDS output differential signals was proposed. The key to the method was the use of unbalanced differential loads. They were used to compensate for the imbalances caused by the DDS, the PCB board, and the transformer. The value of the method was verified by simulations and experimental results.

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Analysis and design of a direct digital-frequency synthesizer with matched differential output

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