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Digitised spread spectrum clock generator using direct variable current modulation

Digitised spread spectrum clock generator using direct variable current modulation

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  • Author(s): H. Guo 1 ; B. Zhang 1 ; Z. Li 1
    • View affiliations
    • Affiliations: 1: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, People's Republic of China
  • Source: Volume 46, Issue 3, 4 February 2010, p. 203 – 205
    DOI:  10.1049/el.2010.3056 , Print ISSN 0013-5194, Online ISSN 1350-911X
© The Institution of Engineering and Technology
Published

A fully-integrated digitised spread spectrum clock generator (D-SSCG) using direct variable current modulation is presented. The proposed D-SSCG realises the spread spectrum function by only adding some micro-current source branches into a conventional clock generator. It has been fabricated in a 0.5 µm BCD process and applied to a fly-back converter, among which the D-SSCG consumes 1.68 mW and occupies an area of 0.032 mm2. Compared with other SSCGs, the proposed D-SSCG is simpler, and has advantages such as good robustness, small size, and low power consumption.

Inspec keywords: signal generators; modulation; phase locked loops; clocks; convertors

Other keywords: power 1.68 mW; phase-locked loop; digitised spread spectrum clock generator; fly-back converter; microcurrent source branches; direct variable current modulation; size 0.5 mum; low power consumption; BCD process

Subjects: Other digital circuits; Signal generators; Convertors; Modulators, demodulators, discriminators and mixers

References

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      • Chen, C.C., Lee, S.C., Liu, S.I.: `A spread-spectrum clock generator using a capacitor multiplication technique', Proc. Emerging Information Technology Conf., August 2005, San Diego, CA, USA, p. 43–46.
    2. 2)
      • Michel, J.Y., Neron, C.: `A frequency modulated PLL for EMI reduction in embedded application', Proc. IEEE Int. ASIC/SOC Conf., 1999, Washington, DC, USA, p. 362–365.
    3. 3)
      • H.W. Chen , J.C. Wu . A spread-spectrum clock generator for EMI reduction. IEICE Trans. Electron. , 1959 - 1966
    4. 4)
      • Li, H.S., Cheng, Y.C., Puar, D.: `Dual-loop spread-spectrum clock generator', IEEE Int. Solid-State Circuits Conf. Dig. Tech. Pprs, 1999, San Francisco, CA, USA, p. 184–185.
    5. 5)
      • H.H. Chang , I.H. Hua , S.I. Liu . A spread-spectrum clock generator with triangular modulation. IEEE J. Solid-State Circuits , 673 - 676
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