High speed high resolution direct digital frequency synthesizer with non-linear DAC coarse quantization and ROM-based piecewise linear interpolation

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• 作者：Xuan Guo ; Danyu Wu ; Lei Zhou ; Huasen Liu&#8230
• 关键词：Direct digital frequency synthesizer (DDFS) ; Read ; only memory (ROM) ; Digital ; to ; analog converter (DAC) ; Heterojunction bipolar transistor (HBT)
• 刊名：Analog Integrated Circuits and Signal Processing
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：90
• 期：1
• 页码：263-272
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Circuits and Systems; Electrical Engineering; Signal,Image and Speech Processing;
• 出版者：Springer US
• ISSN：1573-1979
• 卷排序：90

文摘

A high speed high resolution direct digital frequency synthesizer (DDFS) architecture is presented. The proposed architecture combines the advantage of ROM-based DDFS and nonlinear DAC (NLDAC) based DDFS. The phase-to-amplitude mapping is implemented with NLDAC coarse quantization and further increase its resolution by adding a ROM-based piecewise linear interpolation. ROM size is reduced by using coarse-fine decomposition. A ROM compression ratio of 32 is achieved by further combing the adjacent lines in the same segment into one straight line. A 4-GHz 32-bit DDFS is implemented based on the proposed architecture. The prototype DDFS is fabricated in 0.25 μm SiGe HBT process. The DDFS with 9-bit amplitude resolution are capable of producing a minimum spurious-free dynamic range (SFDR) of 46 dBc up to Nyquist frequency at the clock frequency of 4.0 GHz. Compared with state-of-the-art DDFSs the proposed DDFS demonstrates excellent performance.