JSTS:Journal of Semiconductor Technology and Science

  • 제10권4호
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  • Pages.276-281
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  • 2010
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  • 1598-1657(pISSN)
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  • 2233-4866(eISSN)
대한전자공학회 (The Institute of Electronics and Information Engineers)
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A 2.5 V 109 dB DR ΔΣ ADC for Audio Application

  • Noh, Gwang-Yol (Dept. of Electronic Engineering, Sogang University) ;
  • Ahn, Gil-Cho (Dept. of Electronic Engineering, Sogang University)
  • 투고 : 2010.11.29
  • 발행 : 2010.12.31
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초록

A 2.5 V feed-forward second-order deltasigma modulator for audio application is presented. A 9-level quantizer with a tree-structured dynamic element matching (DEM) was employed to improve the linearity by shaping the distortion resulted from the capacitor mismatch of the feedback digital-toanalog converter (DAC). A chopper stabilization technique (CHS) is used to reduce the flicker noise in the first integrator. The prototype delta-sigma analogto-digital converter (ADC) implemented in a 65 nm 1P8M CMOS process occupies 0.747 $mm^2$ and achieves 109.1 dB dynamic range (DR), 85.4 dB signal-to-noise ratio (SNR) in a 24 kHz audio signal bandwidth, while consuming 14.75 mW from a 2.5 V supply.

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참고문헌

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