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A high speed direct digital frequency synthesizer based on multi-channel structure

Ling Yuan, Qiang Zhang and Yin Shi

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 Corresponding author: Ling Yuan, Email: lyuan@semi.ac.cn

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Abstract: This paper presents a direct digital frequency synthesizer (DDFS) for high speed application based on multi-channel structure. This DDFS has phase resolution of 32 bits and magnitude resolution of 12 bits. In order to ensure the high speed and high resolution at the same time, the multi-channel sampling technique is used and a 12 bits linear digital-to-analog converter is implemented. The chip is fabricated in TSMC 130 nm CMOS technology with active area of 0.89 × 0.98 mm2 and total power consumption of 300 mW at a single 1.2 V supply voltage. The maximum operating speed is up to 2.0 GHz at room temperature.

Key words: direct digital frequency synthesizer (DDFS)multi-channelphase-to-sine-amplitude converters (PSAC)



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Fig. 1.  Conventional DDFS architecture.

Fig. 2.  DDFS based on nonlinear DAC architecture.

Fig. 3.  Architecture for the proposed multi-channel DDFS.

Fig. 4.  Simplified diagram for the DAC cell.

Fig. 5.  $Q^2$ random walk scheme.

Fig. 6.  Architecture for the PSAC.

Fig. 7.  Die photo.

Fig. 8.  Measured DDFS output spectrum. (a) SFDR: 67 dBc @ 382.5 kHz (b) SFDR: 51 dBc @ 62.1 MHz

Fig. 9.  The measured DDFS SFDR versus output frequency at clock frequency of 2.0 GHz.

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Table 1.   Area-utilization efficiency.

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Table 2.   Comparison between different reported DDFSS.

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    Received: 02 November 2014 Revised: Online: Published: 01 June 2015

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      Ling Yuan, Qiang Zhang, Yin Shi. A high speed direct digital frequency synthesizer based on multi-channel structure[J]. Journal of Semiconductors, 2015, 36(6): 065006. doi: 10.1088/1674-4926/36/6/065006 L Yuan, Q Zhang, Y Shi. A high speed direct digital frequency synthesizer based on multi-channel structure[J]. J. Semicond., 2015, 36(6): 065006. doi: 10.1088/1674-4926/36/6/065006.Export: BibTex EndNote
      Citation:
      Ling Yuan, Qiang Zhang, Yin Shi. A high speed direct digital frequency synthesizer based on multi-channel structure[J]. Journal of Semiconductors, 2015, 36(6): 065006. doi: 10.1088/1674-4926/36/6/065006

      L Yuan, Q Zhang, Y Shi. A high speed direct digital frequency synthesizer based on multi-channel structure[J]. J. Semicond., 2015, 36(6): 065006. doi: 10.1088/1674-4926/36/6/065006.
      Export: BibTex EndNote

      A high speed direct digital frequency synthesizer based on multi-channel structure

      doi: 10.1088/1674-4926/36/6/065006
      More Information
      • Corresponding author: Email: lyuan@semi.ac.cn
      • Received Date: 2014-11-02
      • Accepted Date: 2014-12-07
      • Published Date: 2015-01-25

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