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A Multiphase Compensation Method with Dynamic Element Matching Technique in Σ-Δ Fractional-N Frequency Synthesizers

  • Chen, Zuow-Zun (Department of Electrical Engineering and Graduate Institute of Electronics Engineering National Taiwan University) ;
  • Lee, Tai-Cheng (Department of Electrical Engineering and Graduate Institute of Electronics Engineering National Taiwan University)
  • Published : 2008.09.30

Abstract

A multiphase compensation method with mismatch linearization technique, is presented and demonstrated in a $\Sigma-\Delta$ fractional-N frequency synthesizer. An on-chip delay-locked loop (DLL) and a proposed delay line structure are constructed to provide multiphase compensation on $\Sigma-\Delta$ quantizetion noise. In the delay line structure, dynamic element matching (DEM) techniques are employed for mismatch linearization. The proposed $\Sigma-\Delta$ fractional-N frequency synthesizer is fabricated in a $0.18-{\mu}m$ CMOS technology with 2.14-GHz output frequency and 4-Hz resolution. The die size is 0.92 mm$\times$1.15 mm, and it consumes 27.2 mW. In-band phase noise of -82 dBc/Hz at 10 kHz offset and out-of-band phase noise of -103 dBc/Hz at 1 MHz offset are measured with a loop bandwidth of 200 kHz. The settling time is shorter than $25{\mu}s$.

Keywords

References

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