Wide Frequency-Range Spread-Spectrum Clock Generator with Digital Modulation Control

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概要

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• A technique that enables a SSCG to fine-tune an output signal frequency and a spread ratio is presented. Proposed SSCG achieves the output signal frequency from 1.2GHz to 3.0GHz and the spread ratio from 0 to 30000ppm. The fine-tuning technique achieves 30ppm adjustment of the output signal frequency and 200ppm adjustment of the spread ratio. This technique is achieved by controlling a triangular modulation signal characteristics generated by a proposed digital controlled wave generator. A proposed multi-modulus divider can have a divide ratio of 4/5 and 8/9. This SSCG has been fabricated in a 0.13-µm CMOS process. The output signal frequency-range and the spread ratio are achieved fluently from 0.1 to 3.0GHz and from 0 to 30000ppm, respectively. EMI noise is suppressed at less than 17.1dB at the output signal frequency of 3.0GHz and spread ratio of 30000ppm.

著者

• NOTO Takayuki

  Renesas Technology

• SUZUKI Masato

  Renesas Technology

• KAWAMOTO Takashi

  Communication Electronics Research Department, Central Research Laboratory, Hitachi Ltd.

関連論文

• Spread-Spectrum Clock Generator for Serial ATA with Multi-Bit ΣΔ Modulator-Controlled Fractional PLL(Electronic Circuits)
• Wide Frequency-Range Spread-Spectrum Clock Generator with Digital Modulation Control

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