A Spread-Spectrum Clock Generator Using Fractional-N PLL with an Extended Range ΣΔ Modulator(Integrated Electronics)

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概要

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• A spread-spectrum clock generator (SSCG) using fractional-N phase-locked loop (PLL) with an extended range sigma-delta (ΣΔ) modulator is presented in this paper. The proposed ΣΔ modulator simply adds an extra output bit in the first stage modulator. It can enlarge the input range about three times as compared to the conventional modulator and solve the saturation problem when the input exceeds the boundary of the conventional modulator. A flexible digital modulation controller can generate center and down spread-spectrum modulation and each has spread ratios of 0.4%, 0.8%, 1.6% and 3.2%. The proposed SSCG has been fabricated in TSMC 0.35-μm double-poly quadruple-metal CMOS process with output frequency of 300MHz. The active area is 0.63×0.62mm^2 and the power consumption is 17.5mW.

• 2006-06-01

著者

• Kao Yao‐huang

  Chung‐hua Univ. Hsin‐chu Twn

• Kao Yao-huang

  Institute Of Communication Engineering National Chiao-tung University

• HSIEH Yi-Bin

  Institute of Communication Engineering, National Chiao-Tung University

• Hsieh Yi‐bin

  National Chiao‐tung Univ. Hsin‐chu Twn

• Hsieh Yi-bin

  Institute Of Communication Engineering National Chiao-tung University

関連論文

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• P2-54 A Balanced SAW Oscillator for Short Range Transmitters(Short presentation for poster)
• A High Performance Spread Spectrum Clock Generator Using Two-Point Modulation Scheme

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